I finally got around to testing my Leach amp. It seems to work, as in that it didn't blow up or oscillate (at least that I could see on my sub-cheapo scope). It clips about 2/3 of the signal off at 1.15V input and stops clipping at about 0.4V input.
I cannot get the output voltage above about 20V. This is with a 40W bulb in series with my power transformer. If I run it normally (no current limiting), it acts similarly, but not clipping quite as early, still really bad though. I am using a test CD and a small CD player as a freq. generator. It cannot go above about 0.4V @1kHz, 1.125V @60Hz.
I have yet to set the bias current.
What do you suppose the problem might be?
I have yet to set the bias current.
What do you suppose the problem might be?