13-08-2020, 02:56 PM
Interesting work. For electrometer use I wonder if you would get better DC stability with a long tailed pair, with the CCS in the tail. If you need any 6BS7 I think I have a few in the stores. I think it's electrically similar to the 6BR7 but with the grid brought out to a top cap for ultra low leakage.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv







