UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

jim_beacon · 3rd Jun 2006, 9:51 am

I would be looking at a couple of things here:

1. The smoothing cap - are you sure it is good? I've had problems with the units in these chassis before.

2. There are still alot of wax caps on the timebase chassis. Start by looking at the grid coupling caps on the sound, line and frame stages (the frame one is ISTR, a very large one). Leakage in these will cause the valve to conduct heavily and pull down the HT.

After you've checked them, work through the rest of the waxies! There are a lot on the RF chassis, but they are fairly easy to change, most, as I recall are HT decoupling ones (long time since I worked on one of these, and I don't have a diagram in front of me just now).

Jim.

3rd Jun 2006, 9:51 am	#16
jim_beacon Retired Dormant Member Join Date: Mar 2003 Location: Bishop's Waltham, Hants, UK. Posts: 939	Re: Can somebody please repair My TV22 I would be looking at a couple of things here: 1. The smoothing cap - are you sure it is good? I've had problems with the units in these chassis before. 2. There are still alot of wax caps on the timebase chassis. Start by looking at the grid coupling caps on the sound, line and frame stages (the frame one is ISTR, a very large one). Leakage in these will cause the valve to conduct heavily and pull down the HT. After you've checked them, work through the rest of the waxies! There are a lot on the RF chassis, but they are fairly easy to change, most, as I recall are HT decoupling ones (long time since I worked on one of these, and I don't have a diagram in front of me just now). Jim.