Richtige Fernseher haben Röhren!
In Brief: On this site you will find pictures and information about some of the electronic, electrical and electrotechnical technology relics that the Frank Sharp Private museum has accumulated over the years .
Premise: There are lots of vintage electrical and electronic items that have not survived well or even completely disappeared and forgotten.
Or are not being collected nowadays in proportion to their significance or prevalence in their heyday, this is bad and the main part of the death land. The heavy, ugly sarcophagus; models with few endearing qualities, devices that have some over-riding disadvantage to ownership such as heavy weight,toxicity or inflated value when dismantled, tend to be under-represented by all but the most comprehensive collections and museums. They get relegated to the bottom of the wants list, derided as 'more trouble than they are worth', or just forgotten entirely. As a result, I started to notice gaps in the current representation of the history of electronic and electrical technology to the interested member of the public.
Following this idea around a bit, convinced me that a collection of the peculiar alone could not hope to survive on its own merits, but a museum that gave equal display space to the popular and the unpopular, would bring things to the attention of the average person that he has previously passed by or been shielded from. It's a matter of culture. From this, the Obsolete Technology Tellye Web Museum concept developed and all my other things too. It's an open platform for all electrical Electronic TV technology to have its few, but NOT last, moments of fame in a working, hand-on environment. We'll never own Colossus or Faraday's first transformer, but I can show things that you can't see at the Science Museum, and let you play with things that the Smithsonian can't allow people to touch, because my remit is different.
There was a society once that was the polar opposite of our disposable, junk society. A whole nation was built on the idea of placing quality before quantity in all things. The goal was not “more and newer,” but “better and higher" .This attitude was reflected not only in the manufacturing of material goods, but also in the realms of art and architecture, as well as in the social fabric of everyday life. The goal was for each new cohort of children to stand on a higher level than the preceding cohort: they were to be healthier, stronger, more intelligent, and more vibrant in every way.
The society that prioritized human, social and material quality is a Winner. Truly, it is the high point of all Western civilization. Consequently, its defeat meant the defeat of civilization itself.
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.How to use the site:
OLD, but ORIGINAL, Well made, Funny, Not remotely controlled............. and not Made in CHINA.
- If you landed here via any Search Engine, you will get what you searched for and you can search more using the search this blog feature provided by Google. You can visit more posts scrolling the left blog archive of all posts of the month/year,
or you can click on the main photo-page to start from the main page. Doing so it starts from the most recent post to the older post simple clicking on the Older Post button on the bottom of each page after reading , post after post.
You can even visit all posts, time to time, when reaching the bottom end of each page and click on the Older Post button.
- If you arrived here at the main page via bookmark you can visit all the site scrolling the left blog archive of all posts of the month/year pointing were you want , or more simple You can even visit all blog posts, from newer to older, clicking at the end of each bottom page on the Older Post button.
So you can see all the blog/site content surfing all pages in it.
- The search this blog feature provided by Google is a real search engine. If you're pointing particular things it will search IT for you; or you can place a brand name in the search query at your choice and visit all results page by page. It's useful since the content of the site is very large.
Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !
Every CRT Television saved let revive knowledge, thoughts, moments of the past life which will never return again.........
Many contemporary "televisions" (more correctly named as displays) would not have this level of staying power, many would ware out or require major services within just five years or less and of course, there is that perennial bug bear of planned obsolescence where components are deliberately designed to fail and, or manufactured with limited edition specificities..... and without considering........picture......sound........quality........
..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!
Have big FUN ! !
©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All sets and apparates appearing here are property of
Engineer Frank Sharp. NOTHING HERE IS FOR SALE !
Thursday, April 25, 2013
PHONOLA (FIMI) MOD. 2491 CRT TUBE PHILIPS A61-120W.
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