The Amp Garage

Oops, I left that out, there is a 2K resistor in there... I sketched this quickly..
I will play around with this over the weekend and see if I can figure out why it's distorting.

Nothing special.

Re: screens Not sure that makes sense, the tubes ( el34 ) are setup with their screen voltage regulated to 400V. Remember, the original circuit, which had a larger load, operated the power tubes at the same point (plate/screen) as the B+ reduced circuit. I suspect it may be something with the mosfet...

That's essentially what I did. The problem with just installing a switch is that you can only bias the tubes for one case / voltage. So not really easy to switch in and out without re-biasing the tubes. I first tried with with the B+ reducer in, biased for tubes, then remove it and re-biased. The po...

I have an amp that I've used over the years and it developed a problem with one of the mosfets I had installed as an emiter-follower in the power amp driver circuit. I decided to remove the followers and clean up circuitry. The amp worked well, and sounded great however, the reduced load resulted in...