UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Simple reformer for HT capacitors in valve-rectified equipment

Refugee · 19th May 2019, 11:36 pm

That is a posh version of what I do.
The 1N4007 anode goes directly into a safe block that is plugged into the isolating transformer. The negative of the 10uf capacitor goes into the other side of the safe block.
The resistor arrangement is 2 200K 2W resistors with crock clips to add the second resistor in parallel with the first one. The connection is to the rectifier cathode.
This way you can even leave the valves in the amplifier.
I always check the G1 voltages and select any replacement capacitors while reforming is in progress.

19th May 2019, 11:36 pm	#2
Refugee Dekatron Join Date: Apr 2012 Location: Worksop, Nottinghamshire, UK. Posts: 5,553	Re: Simple reformer for HT capacitors in valve-rectified equipment That is a posh version of what I do. The 1N4007 anode goes directly into a safe block that is plugged into the isolating transformer. The negative of the 10uf capacitor goes into the other side of the safe block. The resistor arrangement is 2 200K 2W resistors with crock clips to add the second resistor in parallel with the first one. The connection is to the rectifier cathode. This way you can even leave the valves in the amplifier. I always check the G1 voltages and select any replacement capacitors while reforming is in progress.