LOPT - FLYBACK EHT TRANSFORMER COMPARATION TABLE ORIGINAL ---> HR DIEMEN SPARE PART LIST 10

LOPT - FLYBACK EHT TRANSFORMER COMPARATION TABLE ORIGINAL ---> HR DIEMEN SPARE PART LIST 10

Here below a code list of the original Flybacks LOPTS of many CRT TVs.

 Comparison list is organized with original code to the HR DIEMEN correspondent Replacement part.

 

 These DC flybacks are found in every CRT computer monitor and are called the DST flybacks (diode-split transformers) because of the several high voltage diodes and secondaries inside. In addition to the high resistance resistor cascade (Bleeder) and focus/screen tuning potentiometers described above, these kinds may have an integrated high voltage filtering capacitor (few nanofarads at >=30 kV), or – optionally – a HV capacitor for dynamic focus.

The TV  DC flybacks are also diode-split (DST), however these are found in every modern CRT TV-set from mid-end 80s and onwards. These have just two screen-tuning potentiometers and no internal capacitors whatsoever !

ISTRUCTIONS: To search a specific item within this page use the search function of your browser.

Original Reference	HR
A 04200000271	HR 8604
A 1201-0007	HR 7852
A 1201-0016	HR 7992
A 1201-0027	HR 8214
A 1201-0033	HR 7898
A 1201-0040	HR 8093
A 1201-0047	HR 7843
A 1201-0055	HR 8854
A 1201-0058	HR 8616
A 1201-0070	HR 7974
A 22103-13	HR 5126
A 2437462	HR 7695
A 2437465	HR 46089
A 26-00122 A	HR 8720
A 26-00123 A	HR 8787
A 3 319 45	HR 2265
A 774	HR 4003
A 9 M 308	HR 46006
AA 26-00004 A	HR 8491
AA 26-00007 A	HR 8678
AA 26-00007 Q	HR 7898
AA 26-00008 A	HR 8585
AA 26-00018 A	HR 8501
AA 26-00057 A	HR 8780
AA 26-00058 A	HR 8764
AA 26-00059 A	HR 8585
AA 26-00071 A	HR 8844
AA 26-00075	HR 8787
AA 26-00088	HR 8787
AA 26-00105 A	HR 8852
AA 26-00105 S	HR 8852
AA 26-00116 A	HR 8628
AA 26-00122 A	HR 8720
AA 26-00123 A	HR 8787
AA 26-00124 A	HR 8734
AA 26-00131 A	HR 8735
AA 26-00132 A	HR 8602
AA 26-00147 A	HR 8728
AA 26-30001 C	HR 7605
AA 26-30001 F	HR 7853
AA 26-30001 H	HR 7471
AA 26-30001 J	HR 7680
AA 26-30001 K	HR 7955
AA 26-30001 M	HR 7614
AA 26-30001 N	HR 7959
AA 26-30001 P	HR 8825
AA 26-30001 R	HR 7795
AA 26-30001 T	HR 7992
AA 26-30001 X	HR 8214
AA 26-30001 Y	HR 7898
AA 26-30002 B	HR 8393
AA 26-30002 F	HR 8093
AA 26-30002 H	HR 8481
AA 26-30002 J	HR 7843
AA 26-30002 K	HR 7968
AA 26-30002 P	HR 8854
AA 26-30002 U	HR 8622
AA 26-30003 A	HR 7974
AA 26-30003 B	HR 8856
AA 26-30003 C	HR 7477
AA 26-30003 G	HR 7852
AA 26-30004 D	HR 8614
AA 26-30004 E	HR 8616
AA 26-30004 H	HR 8207
AA 26-30004 X	HR 8856
AA 26-30004 Y	HR 8779
AA 26-30005 C	HR 8494
AA 26-30005 E	HR 8776
AA 26-30005 L	HR 8491
AA 26-30005 Q	HR 8212
AA 26-30005 S	HR 8491
AA 26-30005 T	HR 8764
AA 26-30005 U	HR 8477
AA 26-30005 V	HR 8379
AA 26-30005 X	HR 8779
AA 26-30005 Y	HR 8170
AB50H0000091	HR 7481
AD 300753	HR 8486
AFG 54/2	HR 8029
AFS 203	HR 7462
AFS 204	HR 7140
AFS 206	HR 7437
AFS 210	HR 7277
AFS 214	HR 7471
AFS 217	HR 8621
AFS 219	HR 7731
AFS 221	HR 7623
AFS 223	HR 6062
AFS 230	HR 7223
AFS 234	HR 7094
AFS 237	HR 7791
AFS 239	HR 7711
AFS 240	HR 7691
AFS 242	HR 8096
AFS 243	HR 7432
AFS 244	HR 8358
AFS 245	HR 7443
AFS 246	HR 7398
AFS 247	HR 7565
AFS 249	HR 8543
AFS 250	HR 8376
AFS 251	HR 7128
AFS 253	HR 7666
AFS 254	HR 7666
AFS 255	HR 7970
AFS 256	HR 7927
AFS 257	HR 7971
AFS 261	HR 7880
AFS 263	HR 7037
AFS 264	HR 7591
AFS 265	HR 7296
AFS 266	HR 7105
AFS 267	HR 7126
AFS 268	HR 7488
AFS 269	HR 7452
AFS 270	HR 8157
AFS 271	HR 8559
AFS 272	HR 7141
AFS 273	HR 7434
AFS 277	HR 8377
AFS 278	HR 7772
AFS 279	HR 7483
AFS 280	HR 7159
AFS 281	HR 7378
AFS 282	HR 7131
AFS 283	HR 7839
AFS 284	HR 7918
AFS 286	HR 7840
AFS 288	HR 7377
AFS 289	HR 7998
AFS 290	HR 7612
AFS 291	HR 7900
AFS 293	HR 7511
AFS 294	HR 8005
AFS 295	HR 7433
AFS 296	HR 7854
AFS 297	HR 7494
AFS 298	HR 8035
AFS 299	HR 7535
AFS 300	HR 7256
AFS 301	HR 7473
AFS 302	HR 7257
AFS 303	HR 8538
AFS 304	HR 7386
AFS 305	HR 8003
AFS 307	HR 7474
AFS 309	HR 7378
AFS 310	HR 7950
AFS 311	HR 7977
AFS 312	HR 7906
AFS 314	HR 7386
AFS 315	HR 7916
AFS 316	HR 8154
AFS 317	HR 7443
AFS 318	HR 8044
AFS 319	HR 8771
AFS 320	HR 8095
AFS 321	HR 7985
AFS 322	HR 7814
AFS 323	HR 8759
AFS 324	HR 7146
AFS 326	HR 8783
AFS 327	HR 8032
AFS 329	HR 7154
AFS 330	HR 7459
AFS 331	HR 8188
AFS 332	HR 8080
AFS 333	HR 7962
AFS 334	HR 7279
AFS 335	HR 7973
AFS 336	HR 7243
AFS 338	HR 8119
AFS 340	HR 8428
AFS 341	HR 8228
AFS 342	HR 7344
AFS 343	HR 7774
AFS 346	HR 7535
AFS 347	HR 7360
AFS 348	HR 7816
AFS 349	HR 7228
AFS 350	HR 8118
AFS 351	HR 7922
AFS 352	HR 8007
AFS 353	HR 7984
AFS 354	HR 8116
AFS 355	HR 7503
AFS 356	HR 7384
AFS 358	HR 7934
AFS 359	HR 8416
AFS 360	HR 8320
AFS 362	HR 8785
AFS 364	HR 7627
AFS 366	HR 8327
AFS 368	HR 8604
AFS 525	HR 8572
AG 06592	HR 4001
AL 12-13	HR 1662
AL 12/520	HR 1662
AL 6/500	HR 1662
AM 1409022	HR 7460
AM 1420111	HR 7612
AM 1422180	HR 6283
AM 152355	HR 7687
AM 152591	HR 7464
AM 170467	HR 6355
AM 170468	HR 7674
AM 171509	HR 7226
AM 175082	HR 7362
AM 175344	HR 46045
AM 175714	HR 46045
AM 175966	HR 46049
AM 175996	HR 46049
AM 176407	HR 46050
AM 181297	HR 7687
AM 1813481	HR 7612
AM 1813482	HR 7687
AM 241174	HR 7612
AM 241612	HR 7679
AM 241691	HR 7443
AM 272556	HR 42018
AM 272593	HR 46045
AMS 012/05	HR 42083
AMS 013/17	HR 7527
AMS 175082	HR 7362
AP 2140/01	HR 6493
AS 55 595	HR 4003
AT 1. 66070	HR 3123
AT 1. 66078	HR 3123
AT 100/8-25/1505	HR 2171
AT 100/8-25/1506	HR 3506
AT 100/8-25/1507	HR 2181
AT 100/8-25/1508	HR 2161
AT 110/18/817-5B	HR 658 RSI
AT 110/18/822 A	HR 2275 R
AT 110/25/01	HR 7305
AT 110/25/02	HR 7306
AT 110/25/05	HR 7306
AT 110/25/05 F	HR 7309
AT 110/25/06	HR 7307
AT 110/25/06 F	HR 7307
AT 110/25/07	HR 7311
AT 110/25/1000	HR 7305
AT 110/25/15	HR 7307
AT 110/25/15 F	HR 7309
AT 110/25/20	HR 7325
AT 110/25/21	HR 7319
AT 110/25/22	HR 7321
AT 110/25/26	HR 7321
AT 110/25/29	HR 7326
AT 110/26/01	HR 7306
AT 110/26/02	HR 7306
AT 110/26/05	HR 7308
AT 110/26/05 F	HR 7309
AT 110/26/09 F	HR 7312
AT 110/26/15	HR 7307
AT 110/26/15 F	HR 7309
AT 110/27/07	HR 7311
AT 110/27/17	HR 7317
AT 110/27/23	HR 7320
AT 110/27/24	HR 7322
AT 110/8-25/1505	HR 2171
AT 110/8-25/1506	HR 3506
AT 110/8-25/1507	HR 2181
AT 110/8-25/1508	HR 2161
AT 110/8-25/1509	HR 3686
AT 110/8-25/1530	HR 3530
AT 110/8-25/1531	HR 3687
AT 1109-201	HR 1127
AT 1116-82	HR 2264 CB
AT 1118-7	HR 2264 CB
AT 1118-7 F	HR 2264 CB
AT 1118-7 GH	HR 2264 CB
AT 1118-72	HR 2264 CB
AT 1118-8	HR 025
AT 1118-81	HR 025
AT 1118-87	HR 025
AT 1118-90-50	HR 2270 V5
AT 1118-90-51	HR 2270 V5
AT 1118-90-52	HR 2270 V5
AT 1118-90-53	HR 2270 V4
AT 1118-90-54	HR 2270 V4
AT 1118-90-55	HR 2270 V4
AT 1118-90-56	HR 2270 V4
AT 1118-90-560 S	HR 2270 V4
AT 1118-97	HR 2267
AT 2025	HR 025
AT 2025/00	HR 2267
AT 2025/01	HR 2267
AT 2025/01CS	HR 2267-2
AT 2025/02	HR 2267
AT 2025/02C	HR 2267
AT 2025/06	HR 3122 RSI
AT 2035	HR 2266 R
AT 2036	HR 2266 R
AT 2036/00	HR 2266 R
AT 2036/00/25	HR 2270
AT 2036/00/36	HR 2270 V1
AT 2036/01	HR 2266 R
AT 2036/10	HR 025
AT 2036/17	HR 2270 V4
AT 2036/20	HR 2270 V4
AT 2036/25	HR 2270
AT 2036/36	HR 2272 R
AT 2036/37	HR 2272 R
AT 2037	HR 2272 R
AT 2042	HR 2268 TRSI
AT 2042/01	HR 2268 TRSI
AT 2043	HR 2268 RSI
AT 2044/22.01	HR 2268 TRSI
AT 2048/11	HR 2277 T8S
AT 2048/12	HR 2277 TS
AT 2048/18	HR 3111 TS
AT 2048/18 C	HR 3111 TS
AT 2049/09	HR 7848
AT 2049/49	HR 7848
AT 2051	HR 2051
AT 2051/00	HR 2051
AT 2051/01	HR 51/01
AT 2055	HR 2130
AT 2055/02	HR 3752
AT 2063/00	HR 2063/00
AT 2063/02	HR 2063/02
AT 2063/03	HR 2063/03
AT 2071 ELTRA	HR 2267
AT 2072	HR 2273 TS
AT 2075-30102	HR 7506
AT 2075/20	HR 2075
AT 2075/25	HR 7694
AT 2075/26	HR 2075
AT 2075/30102	HR 7506
AT 2076/01	HR 6030
AT 2076/02	HR 6012
AT 2076/10	HR 6082
AT 2076/20	HR 6078
AT 2076/26	HR 6079
AT 2076/30	HR 6076
AT 2076/50	HR 6050
AT 2076/51	HR 6051
AT 2076/53	HR 6050
AT 2076/60	HR 6297
AT 2076/70	HR 6070
AT 2076/70 A	HR 6070
AT 2076/71	HR 6071
AT 2076/71 S	HR 6071
AT 2076/71 T	HR 6276
AT 2076/80	HR 6080
AT 2076/80 A	HR 6080
AT 2076/81	HR 6081
AT 2076/81 A	HR 6081
AT 2076/84	HR 6050
AT 2076/86	HR 6050
AT 2077/S0	HR 6218
AT 2077/32	HR 6265
AT 2077/33	HR 6455
AT 2077/34	HR 6216
AT 2077/34 K	HR 6216
AT 2077/34 M	HR 6644
AT 2077/35	HR 6603
AT 2077/37	HR 6558
AT 2077/38	HR 6549
AT 2077/39	HR 6550
AT 2077/40	HR 6624
AT 2077/46 A	HR 6378
AT 2077/46 AP	HR 6367
AT 2077/46 R	HR 6367
AT 2077/50	HR 6218
AT 2077/60	HR 6611
AT 2077/8	HR 6211
AT 2077/80	HR 6211
AT 2077/80 S	HR 6211
AT 2077/81	HR 6212
AT 2077/81 A	HR 6212
AT 2077/81 T	HR 6212
AT 2077/83	HR 6362
AT 2077/83 E	HR 6362
AT 2077/83 EP	HR 6362
AT 2077/83 ZP	HR 6374
AT 2077/84	HR 6050
AT 2077/85	HR 6467
AT 2077/85 A	HR 6582
AT 2077/88	HR 6214
AT 2077/88 E	HR 6213
AT 2077/93	HR 6641
AT 2077/93 ZP	HR 6641
AT 2078 YA	HR 8334
AT 2078-20311	HR 8124
AT 2078-20421	HR 8026
AT 2078-20571	HR 8809
AT 2078-20611	HR 8448
AT 2078-20671	HR 8329
AT 2078-20882	HR 8237
AT 2078-21001	HR 8671
AT 2078-21151	HR 8334
AT 2078-21391	HR 8386
AT 2078/B1	HR 8290
AT 2078/B2	HR 8124
AT 2078/B4	HR 8329
AT 2078/B4 A	HR 8329
AT 2078/N	HR 8386
AT 2078/S0	HR 7259
AT 2078/U0	HR 8394
AT 2078/U0-1	HR 8394
AT 2078/U0-2	HR 8272
AT 2078/20	HR 7704
AT 2078/20 AK	HR 7704
AT 2078/20 G	HR 7704
AT 2078/20311	HR 8124
AT 2078/20421	HR 8026
AT 2078/20571	HR 8809
AT 2078/20611	HR 8448
AT 2078/20671	HR 8329
AT 2078/20882	HR 8237
AT 2078/21	HR 7669
AT 2078/21001	HR 8671
AT 2078/21151	HR 8334
AT 2078/21391	HR 8386
AT 2078/24	HR 7808
AT 2078/25	HR 7694
AT 2078/40	HR 7839
AT 2078/50	HR 7259
AT 2078/60	HR 8378
AT 2078/83	HR 7258
AT 2078/83 I	HR 7354
AT 2078/83 TB	HR 7354
AT 2078/83 TI	HR 7354
AT 2078/98	HR 8448
AT 2078/98 ST	HR 8448
AT 2079	HR 2070
AT 2079-30101	HR 7506
AT 2079-30102	HR 7506
AT 2079-37590	HR 7533
AT 2079-37591	HR 7533
AT 2079-37593	HR 7533
AT 2079-37622	HR 7527
AT 2079/A	HR 7656
AT 2079/A0	HR 7656
AT 2079/A1	HR 7802
AT 2079/A2	HR 7656
AT 2079/A3	HR 7656
AT 2079/B0	HR 7650
AT 2079/B1	HR 7662
AT 2079/B10	HR 8252
AT 2079/B11	HR 8255
AT 2079/B12	HR 8257
AT 2079/B13	HR 7817
AT 2079/B4	HR 7659
AT 2079/B5	HR 7660
AT 2079/B6	HR 7650
AT 2079/B7	HR 7662
AT 2079/B8	HR 7650
AT 2079/B9	HR 7662
AT 2079/S	HR 7649
AT 2079/S0	HR 7649
AT 2079/S1	HR 7661
AT 2079/U0	HR 8843
AT 2079/U1	HR 8254
AT 2079/U2	HR 8256
AT 2079/00	HR 7720
AT 2079/09	HR 7519
AT 2079/09 M	HR 7519
AT 2079/09 T	HR 7589
AT 2079/10	HR 7503
AT 2079/10 A	HR 7503
AT 2079/10 B	HR 7503
AT 2079/10 C	HR 7503
AT 2079/10 D	HR 7503
AT 2079/11	HR 7520
AT 2079/12	HR 7586
AT 2079/12 ZP	HR 7586
AT 2079/13	HR 7550
AT 2079/13 A	HR 7550
AT 2079/15	HR 7600
AT 2079/17	HR 7601
AT 2079/18	HR 7541
AT 2079/20 Z	HR 7781
AT 2079/21	HR 7669
AT 2079/23	HR 7604
AT 2079/24	HR 7634
AT 2079/25	HR 7649
AT 2079/26	HR 7781
AT 2079/30101	HR 7506
AT 2079/30102	HR 7506
AT 2079/37590	HR 7533
AT 2079/37591	HR 7533
AT 2079/37593	HR 7533
AT 2079/37622	HR 7527
AT 2079/40	HR 7488
AT 2079/40 V	HR 7488
AT 2079/41	HR 7527
AT 2079/45	HR 7570
AT 2079/45 E	HR 7570
AT 2079/50	HR 7649
AT 2079/51	HR 7527
AT 2079/52	HR 7527
AT 2079/99	HR 7478
AT 2080	HR 2080
AT 2080/00	HR 2080/00
AT 2080/06	HR 2080/06
AT 2080/10	HR 2080/10
AT 2080/100	HR 2080/10
AT 2080/15	HR 2080/15
AT 2080/20	HR 2080/20
AT 2080/50	HR 2080/50
AT 2080/80	HR 2080/80
AT 2085/15	HR 2085/15
AT 2090-30390	HR 7792
AT 2090-37962	HR 7706
AT 2090/01	HR 7706
AT 2090/01-37962	HR 7706
AT 2090/01-37963	HR 7706
AT 2090/08	HR 7698
AT 2090/09	HR 7848
AT 2090/21	HR 7641
AT 2090/30390	HR 7792
AT 2090/31	HR 46109
AT 2090/33	HR 7693
AT 2090/35	HR 46118
AT 2090/36	HR 7936
AT 2090/37962	HR 7706
AT 2090/37963	HR 7706
AT 2090/38	HR 46126
AT 2090/39	HR 46108
AT 2090/39-30360	HR 46108
AT 2090/39-30361	HR 46108
AT 2090/39-30362	HR 46108
AT 2090/39-30363	HR 46108
AT 2090/39-30364	HR 46108
AT 2090/48	HR 46136
AT 2090/49	HR 7848
AT 2090/51	HR 7792
AT 2090/51-30390	HR 7792
AT 2090/51-30391	HR 7792
AT 2090/51-30392	HR 7792
AT 2090/51-30393	HR 7792
AT 2090/51-30394	HR 7792
AT 2090/51-30395	HR 7792
AT 2090/52	HR 46158
AT 2090/54	HR 46109
AT 2091-20531	HR 8617
AT 2091-20641	HR 8437
AT 2091/02 M	HR 6637
AT 2091/02 SF	HR 8241
AT 2091/17	HR 46103
AT 2091/17 D	HR 46103
AT 2091/20531	HR 8617
AT 2091/20641	HR 8437
AT 2092-20461	HR 8595
AT 2092-31491	HR 8590
AT 2092-31591	HR 8753
AT 2092-32371	HR 8363
AT 2092-32372	HR 8363
AT 2092-32491	HR 8363
AT 2092-32492	HR 8363
AT 2092/16	HR 7707
AT 2092/16 SF	HR 7707
AT 2092/20461	HR 8595
AT 2092/28	HR 46101
AT 2092/28 M	HR 46101
AT 2092/30	HR 46102
AT 2092/31491	HR 8590
AT 2092/31591	HR 8753
AT 2092/32	HR 8753
AT 2092/32 S	HR 8753
AT 2092/32 SH	HR 8753
AT 2092/32 TB	HR 8235
AT 2092/32371	HR 8363
AT 2092/32372	HR 8363
AT 2092/32491	HR 8363
AT 2092/32492	HR 8363
AT 2092/38 M	HR 46101
AT 2094/B1	HR 8240
AT 2094/B1-8	HR 8240
AT 2094/D1	HR 8468
AT 2094/01	HR 7693
AT 2094/02	HR 46108
AT 2094/02-30430	HR 46108
AT 2094/02-30431	HR 46108
AT 2094/02-30432	HR 46108
AT 2094/02-30433	HR 46108
AT 2094/03	HR 46126
AT 2094/05	HR 46214
AT 2094/23	HR 46170
AT 2094/30431	HR 46108
AT 2094/31	HR 46120
AT 2094/42	HR 7962
AT 2097/05	HR 46197
AT 2097/05 B	HR 46197
AT 2097/09	HR 46170
AT 2097/09 A	HR 46170
AT 2097/38	HR 46233
AT 2101/01	HR 2101
AT 2101/02	HR 2101
AT 2102/02 A	HR 2101
AT 2102/04 C	HR 2277 T4S
AT 2102/06 C	HR 2277 T14S
AT 2109	HR 1611
AT 2140	HR 2277 T9S
AT 2140/01	HR 6493
AT 2240/16	HR 2287 T6
AT 2250/12	HR 2287 T29
AT 3010/110 C 1	HR 9542
AT 3010/110 LL	HR 9543
AT 3010/110 LS	HR 9543
AT 4021/02/D	HR 0069 T14S
AT 4030	HR 1364 H
AT 4036	HR 1373 T
AT 4042/02	HR 1370
AT 4043/01	HR 1843/01
AT 4043/100	HR 1843/100
AT 4043/34	HR 1843/34
AT 4043/38	HR 1843/38
AT 4043/53	HR 1843/53
AT 4043/60	HR 1843/60
AT 4043/61	HR 1843/61
AT 4043/67	HR 15027
AT 4043/67 A	HR 15027
AT 4043/73	HR 18014
AT 4043/78	HR 18049
AT 4043/78 A	HR 18049
AT 4043/86	HR 1843/86
AT 4043/87	HR 1843/87
AT 4043/87 A	HR 1843/87
AT 4044/20	HR 1544/20
AT 4044/26	HR 1544
AT 4044/27	HR 1544
AT 4044/32	HR 1342
AT 404427	HR 1544
AT 90/11 PINOS	HR 7310
AT 90/23/01	HR 7301
AT 90/23/02	HR 7301
AT 90/23/03	HR 7304
AT 90/23/05	HR 7301
AT 90/23/06 F	HR 7303
AT 90/23/760	HR 7301
AT 90/23/760 A	HR 7301
AT 90/25/02	HR 7304
AT 90/25/03	HR 7302
AT 90/25/05	HR 7313
AT 90/25/05 F	HR 7314
AT 90/25/06	HR 7302
AT 90/25/08	HR 7315
AT 90/25/10	HR 7316
AT 90/25/15	HR 7304
AT 90/25/15 F	HR 7303
AT 90/25/18	HR 7315
AT 90/25/20	HR 7310
AT 90/25/21	HR 7323
AT 90/25/23	HR 7324
AT 90/7 PINOS	HR 7303
AT 90/7,7-23/750	HR 2175
AT 90/7,7-23/751	HR 3682
AT 90/7,7-23/752	HR 2151
AT 90/7,7-23/753	HR 3683
AT 90/7,7-23/754	HR 3684
AT 90/7,7-23/800	HR 2175
AT 90/72-23/751	HR 3682
AT 9425	HR 2265
AT/16/1001	HR 1601
AT/16/1002	HR 1602
AT/16/1003	HR 1603
AT/16/1006	HR 1606
AT/16/1024	HR 1624
AT/16/1025	HR 2080/00
AT/16/1026	HR 2080/15
AT/16/1028	HR 2063/00
AT/16/1029	HR 1629
AT/16/1032	HR 1632
AT/16/1033	HR 1633
AT/16/1050	HR 2080/10
AT/16/1051	HR 1651
AT/16/1101	HR 1621
AT/16/1102	HR 1622
AT/16/1107	HR 1627
AT/16/1108	HR 1628
AT/16/1109	HR 3583
AT/16/1123	HR 1623
AT/16/1124	HR 1624
AT/17/1103	HR 5525
AZ 1-56 CE 3	HR 9688
AZ 1-56 CL 2	HR 9313
AZ 1-56 SA 3	HR 9649
AZ 1-5605 A	HR 9532
AZ 1-5609	HR 9619
AZ 1-5612 A	HR 9648
AZ 1-5614	HR 9635
AZ 1-56250	HR 9332
AZ 1-56403	HR 9334
AZ 1-56403 A	HR 9334
AZ 1-56407 A 1	HR 9556
AZ 1-56415	HR 9556
AZ 2-5601 C	HR 9534
AZ 2101	HR 5126
AZ 2101 A	HR 5126
AZ 2101+13	HR 5126
AZ 2101-113	HR 5126
AZ 2101-13	HR 5126
AZ 2103	HR 5126
AZ 2103-13	HR 5126
AZ 2105	HR 3571
AZ 2105 D	HR 2105
AZ 2106	HR 5163
AZ 2107	HR 5157
AZ 2110	HR 2110
AZ 2111	HR 2155
AZ 2112	HR 1121
AZ 2113	HR 2141
AZ 2114	HR 2115
AZ 2115	HR 5525
AZ 2116	HR 2116
AZ 2118	HR 2075
AZ 2118 A	HR 2075
AZ 2120	HR 1123
AZ 2121	HR 2121
AZ 2302	HR 1357
AZ 2543	HR 1843/34
AZ 3-5650	HR 9675
AZ 31 CE 1	HR 5569
AZ 31 GR 1	HR 2019
AZ 31 GR 2	HR 2018
AZ 31 SA 1	HR 5611
AZ 31 SA 3	HR 5611
AZ 3102	HR 5505
AZ 3102 B	HR 3103
AZ 3102+153	HR 5505
AZ 3102+164	HR 5505
AZ 3103	HR 3103
AZ 3104	HR 1117
AZ 3105	HR 2118
AZ 3106	HR 1130
AZ 3107	HR 5515
AZ 3107 A-47	HR 5565
AZ 3108	HR 5512
AZ 3108+175	HR 5512
AZ 3109	HR 2053
AZ 3109+18G	HR 2053
AZ 3109+180	HR 2053
AZ 3110	HR 2063/00
AZ 3111	HR 2063/02
AZ 3113	HR 3578
AZ 3114	HR 3114
AZ 3114 A 47	HR 5567
AZ 3115	HR 2050
AZ 3115 A	HR 5570
AZ 3116	HR 3763
AZ 3117	HR 3634
AZ 3117 A	HR 3634
AZ 3118	HR 3635
AZ 3119/47	HR 5566
AZ 3120	HR 3120
AZ 3121	HR 1160
AZ 3122	HR 3522
AZ 3122 B	HR 3522
AZ 3122 C	HR 3131
AZ 3125+19K	HR 5526
AZ 3127	HR 5558
AZ 3127+19H	HR 5558
AZ 3129	HR 3766
AZ 3129 B	HR 3766
AZ 3131	HR 3131
AZ 3131 C	HR 3131
AZ 3136	HR 3603
AZ 3136 A	HR 3650
AZ 3520	HR 1553
AZ 3521	HR 1588
AZ 3522	HR 1522
AZ 3526	HR 1577
AZ 3540	HR 1857
AZ 3541	HR 1502
AZ 3575	HR 3643
AZ 3590	HR 1501
AZ 3614	HR 9400
AZ 3614 B	HR 9400
AZ 363004	HR 8170
AZ 363006	HR 8491
AZ 37 SA 3	HR 5611
AZ 3707	HR 5565
AZ 3735	HR 3643
AZ 5-57 SA 1	HR 9314
AZ 56 SA 1/A	HR 9507
AZ 56 SA 3	HR 9649
AZ 5600	HR 9611
AZ 5600 B	HR 9611
AZ 5601	HR 9612
AZ 5605	HR 9668
AZ 5610	HR 9668
AZ 5612	HR 9648
AZ 56120	HR 9655
AZ 5615	HR 9651
AZ 56250	HR 9332
AZ 56403	HR 9365
AZ 56408	HR 9366
AZ 56415	HR 9556
AZ 5650	HR 9675
AZ 5651	HR 9644
AZ 56510	HR 9659
AZ 57 CE 1	HR 9316
AZ 57 SA 1	HR 9314
AZ 57CE 1	HR 9316
AZ 58070 A	HR 9322
AZ 6-58000	HR 9342
AZ 6-58070 A	HR 9322
AZ 60000 A	HR 9320
AZ 9-60000 A	HR 9320
AZ 9100	HR 3615
AZ 9101	HR 3616
AZV 194/2	HR 3766
AZV 305	HR 5526
AZV 416	HR 1535
AZ363003	HR 7898
A3 160 52	HR 2265
A3 264 11	HR 2265
A3 264 12	HR 2265
A3 296 31	HR 2265
A3 319 44	HR 2265
A3 319 45	HR 2265

Line transformers generate the necessary deflection pulse and other many key voltages and the  high voltage for anode of the picture tube in tube televisions and computer monitors. Usually this is around 30 kV for a color device, but the current is  with approx. 0.5 to 4 mA.

The line transformer or horizontal output transformer (English: flyback transformer or line output transformer) is part of a television / monitor with picture tube. It is used to supply the line deflection coil of the deflection system and at the same time usually also to generate the high voltage of 20 to 30 kV required for the operation of the picture tube and other voltages necessary for the operation of the device.

Line transformers work with the line frequency, with European TV sets with 15.625 kHz. Line transformers of 100 Hz televisions work at twice the frequency, i.e. at 31.25 kHz. In monitors, the line transformer is operated at different frequencies, which depend on the resolution of the image sent by the computer. For example, the line frequency of a monitor with a resolution of 1024 × 768 pixels and 85 Hz vertical frequency is approximately 68.7 kHz. With these frequencies, the line output stage switches a switching tube or today a switching transistor, which are used to control the line transformer.
The whistling noise of some older monitors and most older, conventional TV sets arises from the fact that mainly the line transformer, but also other components such as coils and capacitors, are mechanically excited to vibrate by the occurring magnetic and electrostatic forces. Whistling has a frequency of 15.625 kHz due to the European television standard. TVs with 100 Hz technology and most high-resolution computer monitors whistle outside the listening area........

Line transformers are potted with resin and have a ferrite core and are therefore of course only suitable for high frequencies in the kHz range. Newer types, so-called diode split transformers, contain many individual diodes between the windings and thus supply a rectified high voltage (pulsating DC voltage). Older models made of black and white devices have an external cascade, the direct (high-frequency) output voltage is then only about 8 kV, but a little more current is available with such AC line transformers. Line transformers require an electronic control circuit which provides a square wave signal in the range of approx. 15 kHz.

Diode split transformer with permanently cast diodes and DC output The advantage of line transformers: They are easy and inexpensive (or free) and can be obtained in large numbers at radio / TV shops and in computer shops where devices are disposed of. Especially nowadays, in which tube monitors have to make room for flat screens, many old monitors and TVs are disposed of.

Removal and wiring of a line transformer:

Important when removing the line transformer from the TV or monitor: First discharge the picture tube, then remove the high-voltage connection, and draw out the pin assignment of the line transformer before unsoldering. Two connections are particularly important: supply supply (approx. 150V from the power supply unit) and connection that goes to the collector of the horizontal output transistor or on very older types to a tube or thyristor final stage.


The thick, well-insulated, red cable is the high-voltage output (approx. 30kV), while the somewhat thinner, black cable carries the focus voltage, which is only around 6kV. Finally, the orange cable brings the grid 2 voltage, which is only a few hundred volts. Television and monitor flyback transformer pinout have some common designed except that the monitor flyback have a internal capacitor built in. The internal capacitor value have around 2.7 nanofarad to 4.5 nanofarad to improve the picture quality especially when the monitor which can go for a higher resolution compare to Tv. If without the internal capacitor in the monitor flyback the display will curve or slightly out of shape especially at both the right and left hand side of the picture and may present other imperfections not admitted for monitors. It acts as a filter. Internally they may have a high vealue resitor (600 to 900 mega ohm) in parallel to HV output. This to adapt the ouput impedance of the LOPT to the CRT Anode.

Mostly tv and monitor flyback transformers have about ten pins at the bottom of the flyback. Each of the pin have a purpose or function as part of a complete circuit. The common pins that you can find in monitor flyback are: B+ pin, Horizontal collector pulse, ABL (automatic blanking limiter), GROUND, G1, AFC (automatic frequency control), VCC, HEATER (to filament) and X-RAY protection.

The B+ and horizontal collector pulse pin forms one winding which we call it as flyback primary winding. It can  only can be test by using a flyback meter such as the  Lopt tester flyback transformer pinoutor sencore LC102 and LC103C.

Note that some monitors and TV design may have a separate HV and deflections circuits
.
Normal meters can't check this kind of fault. This is the most important winding compares to others and it can easily developed a short circuit when B+ voltage line or Horizontal output transistor (HOT) shorted. Sometimes a shorted internal capacitor in the flyback transformer may cause the primary winding to burn internally and the flyback became bulge and poured out the epoxy.

Other pins are the ground, G1, and AFC winding. AFC stand for automatic frequency control and it send signal (pulse) from the flyback transformer to the horizontal oscillator ic to lock or synchronize the frequency of the monitor. If this AFC line fails the picture will shift either to the far left or far right. There is no way that you can adjust the picture to the center even with the internal adjustment in the mainboard. The purpose of G1 voltage is to pull the electron generated from the cathode (after the heater or filament heat up) and passed it to G2 which is the screen voltage.

G1 normally is a negative voltage or positive from few volts to 32 volts in some most ancient designs . Most tv picture tube do not use G1 voltage. If the G1 voltage is missing or zero voltage to the picture tube the monitor display will becomes very bright with retrace lines (diagonal lines or flyback lines) across the screen and sometimes the monitor will goes into shutdown mode.
ABL stand for automatic beam limiter- I refer it as a limiter further circuit. Why? because whenever there is a contrast or bright problem i will search for this pin and begin to trace from there. Normally a resistor increased in resistance and a shorted ceramic capacitor caused the display to become dim and you may think it might be the fault of a bad CRT.

Heater or filament pin nowadays hardly found in monitor flyback because the crt heater voltage now is derived directly from the switch mode power supply. However heater pin is still can be found in television flyback transformer. If the anode voltage is too high (more than 30 kilovolt), the x-ray protect pin will send a signal to horizontal oscillator ic in order to disable the horizontal drive waveform THIS FOR SAFETY REASONS.

Without the horizontal drive pulse the high voltage generated by the flyback will collapsed and protect the user from excessive x-ray.

The flyback transformer pinout will also generate high pulse ac which later convert to dc through an ultra fast recovery diode. For your information, the ac pulse generated by the flyback transformer cannot be check with our normal analog or digital meter. the frequency is so high and you need a special meter to do the job. The dc voltages are then supply to various circuit such as the vertical output circuit. If you  understand all the functions of each flyback transformer pinout, repairing  monitor or tv will be much easier and save your precious time.

 TV / MONITOR  Fly-Back Transformer Replacement GUIDE:

All repairers with  experience, once made a replacement of a driver transformer with more or less fortune. All we did was to methodize the work and modify the circuit to work optimally.

But....... when it comes to a fly-back Transformer , practically all repairers think that if the replacement is not the exact fly-back  Transformer, absolutely nothing can be done. In principle we would like to clarify that manufacturers of replacement fly-backs do not manufacture all fly-back Transformer variants; they only manufacture some of them and then connect the bases according to the different models and mark them with a different code. ANYWAY SPECIFICITY IS OEM RELATED BY DESIGN.

EXAMPLE:Between different 20" fly-backs Transformer , for example, there are usually minimal differences except in the position of the legs. If there are notable differences, it is in the high voltage because this varies according to the size of the screen. The 14" tubes usually have extra high tensions of 18 to 20 KV; the 20" tubes between 23 and 25 KV and finally the 29 and 33" tubes have tensions higher than 28 KV / 36KV. In addition, the larger tubes have a different horizontal output circuit that has an east/west modulator to correct the pad effect plus other specific parts.

Let's limit our analysis to 14 and 20" TVs from which the fly-back Transformer is not achieved. The first step is to know a fly-back inside to understand the replacement work. Let's analyze the returns and live of the auxiliary windings.
CHECK schematic diagram and study it.

A modern fly-back Transformer is a hybrid of a high and low voltage transformer and a screen voltage and focus adjustment circuit. It can be divided for analysis into a transformer and a focus pack.

NOTE:  fly-back Transformer IS SPECIFIC TO TV / MONITOR CHASSIS BY DESIGN, TAKE ALWAYS ORIGINAL OEM OR ORIGINAL MATCHED REPLACEMENTS.

Transformer analysis:

The transformer is fundamental part of the horizontal output circuit because it connects the source to the collector of the horizontal output transistor through an inductance about 4 times greater than that of the yoke. In this way, only 1.5 to 1.7 A of the 6 or 7 A peak-to-peak current through the yoke flows through the fly-back and the horizontal source capacitor. Be aware that in older tvs which may  have greater deflection systems the currents are higher.

But the fly-back is not an inductor, it is a transformer and part of the energy existing in its primary is transformed into several low voltage windings, which feed different stages of the TV such as the jungle, the vertical output, the video stage , the sound, key voltages for chroma, sync, and many others services depending on design, and above all the tube filament (which is not rectified but applied as AC). These windings are strongly coupled to the primary because they are built above or below it.

The geometry of the fly-back core is very particular because it is a transformer that has a high voltage winding and the turns of that winding must be away from the core. Therefore, the classic shape of the core with an "E" and "I" shape is abandoned and a shape with two "U"'s is used where the HV winding enters loosely. The spool of that winding has a slotted shape, where only the diameter of a wire enters. In this way the winding is really a wire spiral and in reality it is not one single winding but 4 or many more , each one with its corresponding high voltage diode and its filtering capacitor, also of high voltage. This winding, because of its shape, is loosely coupled to the primary so that a fault in it, is not transferred as a short circuit but as a reduction of primary inductance but it will produce a malfunction.

As we know, the return of the high voltage winding is not connected to ground, but to the horizontal source. A 20" tube supports only a maximum current for each cathode of 330 uA; between the three cathodes they can consume a maximum of 1 mA and that current is directed from the cathodes to the aluminizing of the screen that is part of the final anode of the tube. This current returns through the winding and produces a voltage drop in a network
Synthetically, if the image is black there is no current and the voltage of ABL  When the brightness increases, the voltage increases  so that when 1 mA circulates, the voltage   is cancelled and there operates the jungle / luminance matrix stages limiting the brightness and contrast.

Analysis of the focus / G2 VOLT pack inside  DST Transformer

Flyback deflection systems are well known and widely used in television receivers. In such systems, a deflection voltage source drives an autotransformer with a ramp shaped current for deflecting an electron beam across the phosphor coated faceplate of a cathode ray tube (CRT). At the end of the ramp waveform, a relatively large retrace pulse is developed. This pulse is magnified by the turns of the flyback transformer winding and rectified to develop the high DC voltage required to operate the CRT. As is well known, although the high voltage system is tuned, the high DC voltage produced varies substantially with system loading that occurs due to increases in the electron beam current of the CRT. There have been numerous circuits in the art for "stiffening" the high voltage supply. In many applications, a separate, non-deflection-based high voltage system is used because of its tighter tolerance on regulation.

With the growing use of computer monitors, the need for precision CRT displays has increased. In these uses, high voltage regulation is critical and needs to be closely controlled to prevent unacceptable raster distortion and size changes. On the other hand, the needs of the marketplace are such that the cost of the monitor must be maintained as low as possible.

The focus pack has several functions: it is a double variable voltage attenuator also known as HV Bleeder. The highest voltage is for the focus and the lowest for the screen. The older tubes are low focus and the focus pack delivers voltages of approximately 8 KV. The newer and bigger ones are high focus and deliver about 9.5 KV. It is not possible to change a low-focus fly-back for a high-focus one, because it does not adjust the focus.

Generally, the conventional bleeder resistor is manufactured in the following manner. , there is prepared a ceramic substrate  made of Al2 O3 having a purity of about 96%. Its thickness is about 0.5-1.2 mm, and its area is 400-1500 mm2. Upon the ceramic substrate , there is printed PbAg, PtAg, Ag or their combination paste. Then the printed substrate is baked at a temperature of about 800° C., and thus, a printed circuit board is formed, and then lead wires are soldered. Then RuO2 is printed thereupon, and then the structure is baked at a temperature of about 850° C. Thus a resistor having a certain thickness is completed.

Meanwhile, in this resistor, electric current can flow only if the electrical resistance per unit length of the resistor is smaller than the air contact electrical resistivity. In the case where the voltage breakdown resistivity of air is 0.5 KV/mm, if a voltage of 20 KV is supplied across a resistor 12, there has to be secured a distance of 20 KV÷0.5 KV/mm=40 mm. Further, if the thermal degradation and the environmental factors are taken into account, then the safe distance must be 1.8 times as large as the above distance, that is, 40 mm×1.8=72 mm. Meanwhile, in the case where the resistor 12 is printed on the ceramic substrate 10 in a straight line, the length of the ceramic substrate has to be longer, with the result that the total bulk of the ceramic substrate becomes too large.

The screen voltage is approximately the same for all tubes (in the order of 250 to 350V or 500 to 800V). Both voltages are provided by voltage dividers and high value potentiometers because they are directed to grids in the tube that do not consume current. As you can see, the circuit is simply a series of two high voltage potentiometers and two high voltage resistors connected between the pacifier output and ground. In figure above I draw the focus pack circuit only with the characteristic voltages and resistances, which are practically the same (or at least proportional) for all the equipment.


The resistance values are high enough that it is impossible to measure them with a digital or analog tester. It is even impossible to measure the voltages at the focus and screen outputs without altering their value. And they're prone to defects such rising in values or dropping value.

Now that we know the circuit let's start with the replacement work. As the fly-back has two sections we must analyze the failures of both sections separately starting with the fly-backs that have problems in the focus pack.

The most common fault is a dark screen despite the existence of high voltage. A high voltage tip should really be used for the tester if we want to be sure of the existence of the 25KV of AT but generally the test of measuring the screen voltage with the potentiometer at maximum is usually enough to verify that there is high voltage.

The ideal is to use the focus pack of a disused fly-back  Transformer set on a 20" TV that works well to indicate 250V on the screen output by adjusting the potentiometer. Without much error you can interpret that this test TV is 25 KV and already has a high voltage attenuator set that you must connect to the pacifier of the TV under test with an alligator clip that will be covered by the pacifier so that no arcs are produced.

If there is good high voltage and the screen is dark the problem may not be in the fly-back  Transformer. The most basic thing is to see if the tube filament is on and measure the screen voltage if you have not already measured it. If both things are OK, you should measure the focus voltage, with a high voltage tip that has a resistance greater than 200 MOhms.

The measurement with instruments is not dangerous for the circuit, because the focus source is of high impedance. 

At the time when indicated to connect the three cathodes to earth briefly  with resistors of 150KOhms and to return to test if the screen illuminates the problem is in the video card or the jungle.

But if the problem is in the focus pack you don't need to change the whole fly back. Transformer In specialized stores they sell focus packs ready to be connected to the pacifier that generate the focus and screen voltage. Cut the cables of the damaged focus pack, connect the new ones and test. You can also use a fly-back that has a damaged winding. This case is specific with external HT bleeders where the focus voltage is obtained from.


  If the problem is in the winding section of the fly-back Transformer  the first thing to do is to check the operation of the stage with the simulated fly-back instrument. Connect it replacing the primary and measure the collector oscillogram with low source voltage (for example 10% of the nominal value); if you do not have an oscilloscope, try it with the horizontal output detector (a RF detector probe) which can be lowered free of charge from and if the delay voltage has a normal value of about 80V, pass gradually to higher source values until the nominal value is reached.
    If everything is normal, try connecting only the primary of the fly-back Transformer supposedly damaged. This means that you must disconnect all the auxiliary diodes, including the HV pacifier, and try again, starting with a source voltage of 10% of the nominal value, until you reach 100%. If everything is OK, the problem is not in the fly-back Transformer but in some of the auxiliary circuits. Connect the auxiliary diodes one by one and always perform the same test starting from 10% of the source voltage until the damaged auxiliary circuit is discovered. Note: Although unlikely, consider that there may be more than one damaged auxiliary circuit. 

TAKE NOTE THAT THE'RE MAY A SPECIFIC PROTECTIVE TV CIRCUIT THAT WILL STOP THE HORIZONTAL OUTPUT IF IT IS NOT WORKING PROPERLY AND ALSO SOME  TV POWER SUPPLY VOLTAGE MAY NOT WORK PROPERLY IF THE HORIZONTAL OUTPUT IS NOT WORKING PROPERLY DUE TO A FLY-BACK TRANSFORMER WHICH MAY BE DEFECTIVE.

AS EXAMPLE:

In a typical switch mode power supply (SMPS) of a television receiver the AC mains supply voltage is coupled, for example, directly, and without using transformer coupling, to a bridge rectifier. An unregulated direct current (DC) input supply voltage is produced that is, for example, referenced to a common conductor, referred to as "hot" ground, and that is conductively isolated from the cold ground conductor. A pulse width modulator controls the duty cycle of a chopper transistor switch that applies the unregulated supply voltage across a primary winding of an isolating flyback transformer. A flyback voltage at a frequency that is determined by the modulator is developed at a secondary winding of the transformer and is rectified to produce a DC output supply voltage such as a voltage B+ that energizes a horizontal deflection circuit of the television receiver. The primary winding of the flyback transformer is, for example, conductively coupled to the hot ground conductor. The secondary winding of the flyback transformer and voltage B+ may be conductively isolated from the hot ground conductor by the hot-cold barrier formed by the transformer.

It may be desirable to synchronize the operation of the chopper transistor to horizontal scanning frequency for preventing the occurrence of an objectionable visual pattern in an image displayed in a display of the television receiver.

It may be further desirable to couple a horizontal synchronizing signal that is referenced to the cold ground to the pulse-width modulator that is referenced to the hot ground such that isolation is maintained.

A synchronized switch mode power supply, embodying an aspect of the invention, includes a transformer having first and second windings. A first switching arrangement is coupled to the first winding for generating a first switching current in the first winding to periodically energize the second winding. A source of a synchronizing input signal at a frequency that is related to a deflection frequency is provided. A second switching arrangement responsive to the input signal and coupled to the second winding periodically applies a low impedance across the energized second winding that by transformer action produces a substantial increase in the first switching current. A periodic first control signal is generated. The increase in the first switching current is sensed to synchronize the first control signal to the input signal. An output supply voltage is generated from an input supply voltage in accordance with the first control signal.

But if everything indicates that the problem is in the fly-back Transformer and the fly-back is not achieved, then we must find a fly-back Transformer as similar as possible (better original)  to ours and perform a very simple test. Make a 2 or 3 turns winding in any open place of the core by connecting one end of the winding to ground. If you have an oscilloscope, connect it over the added winding to raise the oscillogram; otherwise, connect the rewind pulse detector indicated above to a tip of the winding and then invert it to find both the positive and negative value of the signal. Connect only the primary of the new fly-back and run it at the nominal voltage.

 The oscillogram obtained will be similar to the one in figure: 

The oscillogram could appear inverted since we made our coil with any direction. If it appears inverted, change the ground connection to live. The most important thing is that you measure the peak pulse value of the signal, which in our case is 23.8V. If this voltage corresponds to three turns, calculate the value of voltage per turn as 23.8/3 = 7.9 V/turn.

If you don't have an oscilloscope, you can use the audio probe for the tester (A RF detector probe)  that will indicate directly the  value of the signal or make the double measurement with the delay detector.

Now we have to start modifying the auxiliary voltages of our substitute fly-back  Transformer if necessary. Let's start with the filament voltage. Observe the circuit of the substitute fly-back to find the ground leg and connect it to ground. Now measure the other auxiliary legs and note the peak to peak values. The filament should have a  peak pulse voltage of about 22 or 23 V. Do not try to measure the RMS voltage with a common tester or with the peak value probe. None of the classic instruments will show a peak pulse value of 6.3V. It is best to calculate the RMS value as a function of the peak-to-peak value for a delay time of 12 uS, which is what we did to indicate the correct peak value of 22.5V.

It is very likely that by changing the number of turns you will not be able to achieve the exact value. In that case you should calculate the excess turns and then adjust the resistor  value to get 22.5V on the filament. In our case you can test the voltage value of the filament winding and if it is close to the indicated one modify the value of resistor .

Is it very important that this voltage value is accurate? Yes, but a fluctuation of 1V cannot shorten the life of the tube but it's better avoided. The filament of a tube is far from the melting point, i.e. it is undervolted to increase the life to a value far above the cathode depletion but also better avoided.

Adjusting a Running Auxiliary Voltage

Let's suppose that the winding for the vertical voltage has to give 25V and gives 18. We measure that our fly-back has 7.9 V peaks per turn. For a delay time like the one indicated, the relationship between the positive semicircle and the peak value taken from the oscillogram in figure 30.4.3 is 3,07/23,8=0,13. This means that each turn adds a voltage of 3.67V to the rectified voltage and that to go from 18 to 25 you have to add approximately two turns (7.34V+18 = 25.34V). Without an oscilloscope, I have to add the two turns  and measure a voltage of 3.67/0.13= 28.2V with the peak probe. Now, I must cut the printed circuit and connect from the fly-back leg a wire that must pass twice inside the core and solder it to the cut track on the side of the diode.

Note: the direction of the winding is impossible to determine a priori, the most advisable thing to do is to choose any and measure if the voltage has the correct value. If not, the winding or connections must be reversed.

In this way all windings must be corrected, so that the fly-back is ready to perform a final test with everything connected.

But the auxiliary voltages are not all that differentiate one fly-back from another. In the next delivery we will explain how to perform the final test without burning anything in the attempt, and that should be changed if the width is not correct.