Hello!
OK, I made this class A 3x12AQ5 amplifier with a PCL805 triode as the pre-amp.
The tubes are all in parallel with 5.1k grid stoppers for each, 220Ohm screen stopper for each and a 1MOhm leakage resistor for all of them. The PSU voltage is 170V. The audio input is 2V max P-P.
The problems I currently have are:
Really low gain compared to the pentode of one PCL805.
Distortion at high volume.
Can anyone point out the problem?
Thanks!
OK, I made this class A 3x12AQ5 amplifier with a PCL805 triode as the pre-amp.
The tubes are all in parallel with 5.1k grid stoppers for each, 220Ohm screen stopper for each and a 1MOhm leakage resistor for all of them. The PSU voltage is 170V. The audio input is 2V max P-P.
The problems I currently have are:
Really low gain compared to the pentode of one PCL805.
Distortion at high volume.
Can anyone point out the problem?
Thanks!
Last edited: