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

dominicbeesley · 9th Sep 2011, 1:02 pm

It sounds like you might have duff electrolytic smoothers.

I can't remember what equipment you've got col but a test might be to lift the D11 connection from the radio/telly switch and apply a high DC voltage (say 250V) via a resistor (say 100k to start) between D11 and chassis and see what happens. You should get slowly rising voltage as the capacitor rights itself then you can change over to a lower value resistor as it improves to speed up the process. I'm saying all this but I bet you've got a capacitor reformer anyway among all your kit!

It sounds like what has happened is the PY32 has started to work (with the low heater volts before it was probably just trickling) and dumped full power into an un-reformed capacitor.

It might not be that but not a bad place to start...I'm sure the real experts will be along with better advice shortly!

D

9th Sep 2011, 1:02 pm	#63
dominicbeesley Octode Join Date: Nov 2004 Location: Hebden Bridge, West Yorkshire, UK. Posts: 1,885	Re: Restorers dream part 2 the chassis. It sounds like you might have duff electrolytic smoothers. I can't remember what equipment you've got col but a test might be to lift the D11 connection from the radio/telly switch and apply a high DC voltage (say 250V) via a resistor (say 100k to start) between D11 and chassis and see what happens. You should get slowly rising voltage as the capacitor rights itself then you can change over to a lower value resistor as it improves to speed up the process. I'm saying all this but I bet you've got a capacitor reformer anyway among all your kit! It sounds like what has happened is the PY32 has started to work (with the low heater volts before it was probably just trickling) and dumped full power into an un-reformed capacitor. It might not be that but not a bad place to start...I'm sure the real experts will be along with better advice shortly! D