10-21-2020, 10:59 AM
1N4007 will work you will need to change R-20 from 22ohms to something around 50-80ohms. The 1N4007 will drop voltage around 7/10 of a volt the old SR-1 was dropping the voltage around 7 volts. Plus with todays higher mains voltage necessary to get B+ in the right spot. I do like wire wound but have used carbon when that was the only kind at hand. The carbon will have a shorter life.
