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  #1  
Old 04-11-2009, 05:08 PM
Mikey405 Mikey405 is offline
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Broken Philips 21KX102A Roundie

Hi everyone.

I'd really like to get my old Philips 21KX102A (K4 Chassis) TV working but it requires a line output transformer to make it go. Does anyone know where these sets were sold originally? I don't think they were ever sold in the USA but I could be wrong, although I think they may have been sold in Canada. It would be very useful to know where to start searching. They were only in the UK as experimental sets for universities and specialist applications etc., and they had a separate PAL decoder fitted.

I was very kindly provided with a lopty by a kind member of this forum (and then in return I took months to send him a TV from the UK, but that's another story...) but unfortunately it also had a shorted turn. I have tried wiring up a transformer from another TV to the cathode of the PY500s and the anode of the PL504s to check everything else and the lopty crackles and arcs into life, but all 4(!) of the proper K4 loptys I have are duds, and they all stress the PL504s when connected in the same manner. I now have a selection of different primarys and secondarys which can't be used together for one reason or another. I am going to try and get someone to help me cut off the overwind from the most recent lopty and perhaps try and use a standard 25KV secondary from a slightly later Philips G25K500 (G6 chassis). If it's the primary that's duff though then I'm not going to have much luck.

If anyone has any suggestions then I'd be very happy to try anything. (Well, almost anything.)

Thanks everyone.

Kind regards.

From Mike. (UK).

Last edited by Mikey405; 04-11-2009 at 05:19 PM.
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  #2  
Old 04-12-2009, 02:26 PM
avijit avijit is offline
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This set is quite a rarity. It's a 25" Baird 8724. It uses a first-generation Thorn 3000 single standard chassis. I bought this set from a great bloke called Haden from Wigan who had it in his back shed. The set needed a bit of work to get it into working condition, but now it has a superb picture and the tube, which was a little flat to start with, boosted well and has lasted OK up to now. Click on the picture for a bigger view.

Last edited by luvvinvinyl; 04-12-2009 at 03:52 PM.
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Old 04-14-2009, 03:02 PM
Mikey405 Mikey405 is offline
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Quote:
I have tried wiring up a transformer from another TV to the cathode of the PY500s and the anode of the PL504s to check everything else
Of course, I meant PY801s, not PY500s. D'oh.
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Old 04-19-2009, 01:55 PM
yagosaga's Avatar
yagosaga yagosaga is offline
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Quote:
Originally Posted by Mikey405 View Post
Of course, I meant PY801s, not PY500s. D'oh.
Of course, you meant PY88s, not PY801s...

Last edited by yagosaga; 04-19-2009 at 02:08 PM.
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Old 04-21-2009, 05:15 PM
Mikey405 Mikey405 is offline
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Quote:
Originally Posted by yagosaga View Post
Of course, you meant PY88s, not PY801s...
Oh, well, whatever they are. It starts with a P and it has at least one 8 in it...

And most likely a Y too.
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Old 05-10-2009, 06:12 PM
telocho telocho is offline
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I think K4 with the PAL decoder were used for experimental color broadcasts from Eindhoven, The Netherlands, before the K6 chassis was finally mass produced in 1967. The K4 is quite a rare set. The all-tube NTSC version was produced for the Canadian market, from 1964, I don't know if any survived.
Try Marcel at marcelstvmuseum.com
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