Bush TV32. - UK Vintage Radio Repair and Restoration Discussion Forum

radiograham · 24th May 2023, 11:17 pm

This TV was bought as a parts only set from "high vacuum house" for £15. I picked it up at Golborne in April. First impressions were not good as you can see from the pics, surprisingly all the wound components turned out to be OK which was a surprise, I expected at least one of them to be o/c. Also the main electrolytics seemed to be in good condition. Armed with this knowledge I set about recapping the main deck. The waxys were in horrible condition basically falling apart, just snipping them out of circuit the cardboard was falling apart. I did reach a point where I thought am I wasting my time with this but plodded on, I managed to use spare tags on the boards which although dirty tinned well after a clean. The small electrolytics were replaced with 10uF 450 volt types and I replaced a few high value resistors. I then turned my attention to the various pots. The v/control turned out to be OK but the brilliance pot was o/c, this was replaced with a 50k ww type very similar to the original. All the rest though seized up responded to a good cleaning and lubrication. As regards valves I tested the line output and boost diode, PL81 100% PY81 u/s this was replaced with a used tested one.

FERNSEH · 25th May 2023, 9:16 pm

Very rare set and well worth restoring.
Been searching through the Radio and Television books for information about the TV32. No reference in the books I have here. I guess the upper chassis deck resembles the Bush TV36C and the RF unit is similar to later production units with EF80 pentodes.
Link to a TV32 restorations:

https://www.vintage-radio.net/forum/...d.php?t=124007

And

https://www.radios-tv.co.uk/communit...s/bush-tv32-3/

DFWB.

radiograham · 26th May 2023, 1:05 am

Hi,continuing on from my last post,the last thing was replacing some of the wiring which had started to crumble.The loom from the rf deck and the one to the scan coils were ok.The one to the crt base was replaced plus the one from the mains in to the on/off switch.I have a auto transformer with taps at 100-150-200-240 used in conjunction with a isolating transformer,I use a small crt for test 100 volt first,then gradually increase to 150.At 150volt there was some signs of life,a blue spark from ey51 anode but no eht.I tacked in a silicon eht diode and we had eht and a raster.I knew the crt in this set was u/s but i had a tube from an old gec set which i thought was a 7201a but it turned out to be a 7203a straight gun triode which of course does not need a ion trap magnet.I fitted this and the only thing different was the focus magnet had to be raised slightly,also fitted a new ey51.

radiograham · 26th May 2023, 1:31 am

Forgot to say, hope I am not tempting fate but i have always been lucky with my LOPT's. The set is now running on full 240VAC, two hours plus and the overwind is cool as a cucumber, primary same. Lets hope it stays like that, the overwind has a clear plastic cover no pitch present. Whether this has anything to do with it I don't know. Also replaced all the EF80's in RF deck as they were all down to about 2mA anode current, with very little slope.

24th May 2023, 11:17 pm	#1
radiograham Hexode Join Date: Oct 2017 Location: Manchester, UK. Posts: 320	Bush TV32. This TV was bought as a parts only set from "high vacuum house" for £15. I picked it up at Golborne in April. First impressions were not good as you can see from the pics, surprisingly all the wound components turned out to be OK which was a surprise, I expected at least one of them to be o/c. Also the main electrolytics seemed to be in good condition. Armed with this knowledge I set about recapping the main deck. The waxys were in horrible condition basically falling apart, just snipping them out of circuit the cardboard was falling apart. I did reach a point where I thought am I wasting my time with this but plodded on, I managed to use spare tags on the boards which although dirty tinned well after a clean. The small electrolytics were replaced with 10uF 450 volt types and I replaced a few high value resistors. I then turned my attention to the various pots. The v/control turned out to be OK but the brilliance pot was o/c, this was replaced with a 50k ww type very similar to the original. All the rest though seized up responded to a good cleaning and lubrication. As regards valves I tested the line output and boost diode, PL81 100% PY81 u/s this was replaced with a used tested one. Attached Thumbnails Attached Images

25th May 2023, 9:16 pm	#2
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,291	Re: Bush TV32. Very rare set and well worth restoring. Been searching through the Radio and Television books for information about the TV32. No reference in the books I have here. I guess the upper chassis deck resembles the Bush TV36C and the RF unit is similar to later production units with EF80 pentodes. Link to a TV32 restorations: https://www.vintage-radio.net/forum/...d.php?t=124007 And https://www.radios-tv.co.uk/communit...s/bush-tv32-3/ DFWB.

26th May 2023, 1:05 am	#3
radiograham Hexode Join Date: Oct 2017 Location: Manchester, UK. Posts: 320	Re: Bush TV32. Hi,continuing on from my last post,the last thing was replacing some of the wiring which had started to crumble.The loom from the rf deck and the one to the scan coils were ok.The one to the crt base was replaced plus the one from the mains in to the on/off switch.I have a auto transformer with taps at 100-150-200-240 used in conjunction with a isolating transformer,I use a small crt for test 100 volt first,then gradually increase to 150.At 150volt there was some signs of life,a blue spark from ey51 anode but no eht.I tacked in a silicon eht diode and we had eht and a raster.I knew the crt in this set was u/s but i had a tube from an old gec set which i thought was a 7201a but it turned out to be a 7203a straight gun triode which of course does not need a ion trap magnet.I fitted this and the only thing different was the focus magnet had to be raised slightly,also fitted a new ey51. Attached Thumbnails

26th May 2023, 1:31 am	#4
radiograham Hexode Join Date: Oct 2017 Location: Manchester, UK. Posts: 320	Re: Bush TV32. Forgot to say, hope I am not tempting fate but i have always been lucky with my LOPT's. The set is now running on full 240VAC, two hours plus and the overwind is cool as a cucumber, primary same. Lets hope it stays like that, the overwind has a clear plastic cover no pitch present. Whether this has anything to do with it I don't know. Also replaced all the EF80's in RF deck as they were all down to about 2mA anode current, with very little slope.