UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Oh no

dominicbeesley · 18th May 2010, 5:23 pm

Hello all,

I have to admit to being a bit stumped now. I've replaced PL81, PY81, PY82s and tried various ECL80s in the line-bistable, replaced out of tolerance resistors in line stage. All valve voltages given in Trader sheet are within 5% and waveforms given in Pye manual are either spot on or a bit over - except for [17] (line feedback?) which is 300V instead of 400V.

Only thing I can think of now is LOPT - what's the best (safest) way of removing these? Is it worth giving it a few hours in the oven?

Any advice would be gratefully received.

Dom

18th May 2010, 5:23 pm	#47
dominicbeesley Octode Join Date: Nov 2004 Location: Hebden Bridge, West Yorkshire, UK. Posts: 1,885	Re: Oh no - another V4! Hello all, I have to admit to being a bit stumped now. I've replaced PL81, PY81, PY82s and tried various ECL80s in the line-bistable, replaced out of tolerance resistors in line stage. All valve voltages given in Trader sheet are within 5% and waveforms given in Pye manual are either spot on or a bit over - except for [17] (line feedback?) which is 300V instead of 400V. Only thing I can think of now is LOPT - what's the best (safest) way of removing these? Is it worth giving it a few hours in the oven? Any advice would be gratefully received. Dom