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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc.

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Old 12th Mar 2017, 1:01 pm   #1
sexton_mallard
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Default 'Frankenstein' TVs. Using modern CRTs in vintage sets.

It occurred to me that the availability of usable CRTs is finite and continues to dwindle. There must be numbers of larger (14" plus) CRTs in modern TVs which are available albeit rapidly being disposed of. Has anyone tried (for instance) running a modern CRT in a 'vintage' chassis in which an original correct spec CRT has been impossible to source? This would include the yoke components etc. I guess there is nothing to lose in trying. The end result would be a 'Frankenstein' set but then then this would be the revival of a set with a dead CRT which would otherwise end up being scrapped for spares or worse.
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Old 12th Mar 2017, 1:35 pm   #2
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Default Re: 'Frankenstein' TVs. Using modern CRTs in vintage sets.

Apologies...just to clarify, the yoke assembly that came from the modern donor set would be used.
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Old 12th Mar 2017, 1:43 pm   #3
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Default Re: 'Frankenstein' TVs. Using modern CRTs in vintage sets.

It has been done in the past and will no doubt be done again with more recent sets. I believe the one below was eventually re-united with a correct original CRT and other components.

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Old 12th Mar 2017, 1:47 pm   #4
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Default Re: 'Frankenstein' TVs. Using modern CRTs in vintage sets.

Sort of restuffing on a grand scale. And why not?
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Old 12th Mar 2017, 2:07 pm   #5
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Default Re: 'Frankenstein' TVs. Using modern CRTs in vintage sets.

Actually the situation regarding the supply of 14" rectangular CRTs is far worse than the older round 12" tubes.

DFWB.
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Old 12th Mar 2017, 2:44 pm   #6
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Default Re: 'Frankenstein' TVs. Using modern CRTs in vintage sets.

When I was 12, I tried to fit the good tube out of a dead Ferguson 38030 into the Ferguson version of a Marconophone 4816 despite the CRT envelope shape, pinout etc being completely different. Fully enough I did not succeed!
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Old 12th Mar 2017, 3:10 pm   #7
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Default Re: 'Frankenstein' TVs. Using modern CRTs in vintage sets.

It may well be possible to fit a modern CRT into an older chassis. Given that modern tube necks are very much smaller than the old 38mm necks, a lot less scanning power will be required. [The deflection field is a lot closer to the actual electron stream]
The other difficulty that has to be overcome is the EHT voltage. Vintage receiver chassis have limited scanning power and low EHT. Modern tubes have generally higher EHT and are aluminised requiring even greater EHT. The higher the EHT the more scanning power is required due to the stiffness of the electron beam. If you lower the EHT to increase picture size you will loose a lot of brightness. It's a typical chicken and egg senario.
However it would be worth a try just to see what happens and if it is feasible. John
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Old 12th Mar 2017, 5:12 pm   #8
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Default Re: 'Frankenstein' TVs. Using modern CRTs in vintage sets.

That's just given me a silly idea... I've got an Ekco TU 211 TV on the bench currently, with a completely clapped out Mazda CRM 122 in it. Maybe I could try connecting up a tube from one of those 80's black and white portables! Obviously, not a permanent solution, but it might help me whilst restoring the chassis!

I have been keeping a few of the late 90's and early 2000's portable colour sets, and salvaging tubes and scan coils from dead ones, just in case they become useful. Just the little ones, no bigger than 14", as I haven't much room to store them.

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Old 12th Mar 2017, 5:16 pm   #9
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Default Re: 'Frankenstein' TVs. Using modern CRTs in vintage sets.

Hi Lloyd, that is exactly what I had in mind to try (if I had the sets parts, skill and the time at the moment) Good luck.
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Old 12th Mar 2017, 5:49 pm   #10
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Default Re: 'Frankenstein' TVs. Using modern CRTs in vintage sets.

I suppose you could say the Baird T23 is a sort of Frankenstein set because the Cathodevisor 15MW1 CRT had been substituted with a slightly more modern Cossor 65K tube.

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Old 12th Mar 2017, 10:29 pm   #11
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Default Re: 'Frankenstein' TVs. Using modern CRTs in vintage sets.

square and 'pillow' shaped crts are still available new to buy in 9/10/12in sizes. I buy them from the states and generally work out at £50 for the tube and another £50 to get it here with duties. Just a thought!

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Old 13th Mar 2017, 5:08 am   #12
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Default Re: 'Frankenstein' TVs. Using modern CRTs in vintage sets.

So, does anyone want this one with coils and LOPT?
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