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National Panasonic TV TR-902D

 
mfd70
(@mfd70)
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Following information from Lloyd over on the wall, I took a look at a little (10 inch) Panasonic TV I got hold of just before Christmas. It caught my eye as it is a US 525 line TV 120V mains or 12V battery. I don't know how it ended up in Britain, but I suspect it was modified for use with an autotransformer as there are oversize fiber washers fitted under the knobs. It is fully isolated on mains, but maybe the insulation was not up to 240 V.

I tried it on 12V and and got a good picture on VHF, nothing on UHF though, I can't find any information about this TV, I guess it dates from the sixties. An interesting little TV, I need a mains/DC  input plug and also VHF channel selector knob and fine tune knob but it was nice to see a picture after probably many years dormant.

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Topic starter Posted : 27/03/2019 10:12 pm
Nuvistor and ntscuser liked
mfd70
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DSC006160001
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Topic starter Posted : 27/03/2019 10:30 pm
Nuvistor
(@nuvistor)
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There is a white plastic tube run the height of the cabinet near the control knobs. Is is an enclosure for a telescopic aerial?

Frank

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Posted : 28/03/2019 6:46 am
Lloyd
(@lloyd)
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Good to see it worked! I was worried that maybe the connections were different between manufacturers. Certainly an unusual looking set, the knobs on the side look like a bit of an afterthought!

Regards

Lloyd

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Posted : 28/03/2019 9:26 am
mfd70
(@mfd70)
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Yes it is.

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Topic starter Posted : 28/03/2019 9:26 am
mfd70
(@mfd70)
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The wiring of the connector was a bit confusing to work out, I guessed the mains pins were the spaced ones and they measured like a mains transformer. There are then two pins providing 12V dc from the internal transformer and rectifier, which would be linked to the DC input pins inside a mains plug, I didn't expect these to be diagonally opposite, and as I guess most of the transistors are PNP, the 12v rail is negative to chassis, this made confirming the correct input a bit tricky, I applied the volts slowly from a current limited supply until I was sure nothing was going to pop.

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Topic starter Posted : 28/03/2019 9:35 am