• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

CCS on SE 2A3 cathode

Hi all,

Doesn't hear much on putting CCS at SE tube's cathode, 2A3 and 300B or alike.
I did make a pp EL84 with CCS on cathode with very good result, so I thought it might be a good idea to convert my 2A3 with that configuration.
I wonder if anyone out there has tried this configuration, and what is the result.
mus said:
But I don’t know the bypass cap can wired up that way?

You are probably talking of the NFB cap. Not sure i like it much either.

Btw, the interstage transformers i've tried don't sound too great loaded with 47k but you get low ringing on the scope. A much better compromise is to load with a snubber.

Nothing can convince me that the horrible 317 CCS is not audible in that position.
i was using LM317 in cathode of the 12B4 preamplifier - it was better than classic resistor but it was audiable that it is there.....so i ended using a ccs in the anode of the the tube....much much better.....
i assume that 317 ccs can be very well heard in this application....
especially in the treble...