Re: Update on Williamson Amplifier
Posted: May 27th, 2020, 11:08 am
Okay. Here's an idea. Disconnect the bias voltage and try cathode bias (I think Hafler says 200 ohms?) and see if it still oscillates.
DC Area Audio DIYer's Community
http://www.dcaudiodiy.com/phpBB3/
FerdinandII wrote:Do you have a cheap set of speakers you could attach to the outputs? It might help you identify whether this is a low frequency or a high frequency oscillation. The culprits would be quite different, I imagine. If it's motor-boating for instance, that's something you would hear right away.
Grover Gardner wrote:Okay. Here's an idea. Disconnect the bias voltage and try cathode bias (I think Hafler says 200 ohms?) and see if it still oscillates.
David McGown wrote:Grover Gardner wrote:Okay. Here's an idea. Disconnect the bias voltage and try cathode bias (I think Hafler says 200 ohms?) and see if it still oscillates.
Grover,
I was considering trying self bias as a last resort, but I guess it might be at this stage in the game.
David