TELEVISION CRT TUBE PHILIPS A61-120W
QUICK REFERENCE DATA
61 cm (24in)direct viewing television tube with metal backed screen
and reinforced envelope. A separate safety screen is not required.
Suitable for use in receivers with push—through presentation. This
tube is fitted with a ring trap base.
Deflection angle 110 deg
Light transmission (approx.) 42 %
Maximum overall length 370 mm
This data should be read in conjunction with GENERAL OPERATIONAL
RECOMMENDATIONS — TELEVISION PICTURE TUBES
Suitable for series or parallel operation
Vh ’ 6.3 V
Ih 300 mA
The limits of heater voltage and current are contained in ‘General Operational
Recommendations — Television Picture Tubes.
Note - applies to series operation only
The surge heater voltage must not exceed 9.5V r.m.s. when the supply is
switched on. A current limiting device may be necessary in the circuit. to
ensure that this voltage is not exceeded.
OPERA TING CONDITIONS
Va2+a4 _ 20 20 kV
Vag (focus electrode control range) 0 to 400 0 to 400 V
V 400 500 V
Vg for visual extinction of focused raster -40 to -77 -50 to -93 V
*Vk for visual extinction of focused raster 36 to 66 45 to 80 V
*For cathode modulation, all voltages are measured with respect to the
SCREEN (metal backed)
Fluorescent colour White
Light transmission (approx.) 42 %
The range of focus voltage shown in !Operating Conditions’ results in opti-
mum overall focus at a beam current at 250pA.
Diagonal deflection angle 110 deg
Horizontal deflection angle 98 deg
Vertical deflection angle 81 deg
The deflection coils should be designed to provide a pull—back of 4 .0mm on
a nominal tube .
cg_au 7.0 pF
ck_an 5.0 pF
°a2+a4-M 1500 to 2300 pF-(-
°a2+a4—B 600 PF
EXTERNAL CONDUCTIVE COATING
This tube has an external conductive coating, M, and in accordance with
the General Operating Recommendations this should be connected directly
to pin 5 and not to chassis. The electrical connection to this coating must
be made within the area specified on the tube outline drawing. The capaci-
tance of this coating to the final anode is used to provide smoothing for the
For flashover protection of the receiver, parallel spark gaps are included
for all the electrodes in the base of this tube, and the common connection
is made to pin 5. These spark gaps are intended as part of a system for
full flashover protection. A direct connection must always be made from
pin 5 to chassis, and the external conductive coating returned to chassis
only via pin 5, using short leads. Any electrode supplied directly from a
high energy source (such as the h.t. line) should be provided with a series
See note under this heading in ‘General Operational Recommendations —
Television Picture Tubes‘.
Centring magnet field intensity . 0 to 800 A/ In
Maximum distance of centre of
Vcentring field from reference line 57 mm
Adjustment of the centring magnet should not be such that a general reduc-
tion in the brightness of the raster occurs .
REFERENCE LINE GAUGE
J .E.D.E.C. 126. For details see ‘General Operational Recommendations-
Television Picture Tubes‘ .
Any. The tube socket should not be rigidly mounted’ but should have ﬂex-
ible leads and be-allowed to move freely. The bottom circumference of the
base shell will fallwithin a circle of: 40mm diameter which is centred on
the perpendicular from the centre of the face.
This tube is fitted with a pin protector in order to avoid damage to the
glass base due to bending of the base pins whilst handlingthe tube.
It is advisable to keep this pin protector on the base until it can be replaced
by the socket after installation of the tube in any equipment’.
RATINGS (DESIGN CENTRE SYSTEM)
Va2+a4 max. (at la2+a4 =0) (see note 1) 20 kV I
Va2+a4 min. 13 kV
+V max. 1.0 kV
-V max. 500 V
V’ max. 700 V
V min. 350 V
—vg(pk)b max. (see note 2) 400 V
-Vg max. (see note 3) 150 V
tIa3 max. 25’ pA
tlal max. 5 uA
Vh_k (see note 4)
d.c. max. 250 l V
pk max . 300 V
d.c. max. 135 V
pk max. 180 V
Rh_k max. 1 .0 M9
Zk_e max. (f=50I-lz) 100 kn
R max. 1.5 M52
Zg_k max. (f= 50}hz) 500 k9