Bottlehead Forum

General Category => General Discussion => Topic started by: fdandrews on February 09, 2010, 05:14:38 AM

Title: Cathode capacitor, do I need one?
Post by: fdandrews on February 09, 2010, 05:14:38 AM

Hi! I'm in the middle of building a parallel feed amp with a 6W6 output tube and cathode bias. I plan to use it only above 100hz in a biamped system. Does the cathode resistor still need a capacitor across it? Can I leave it out to reduce the low frequency signal going to the main speakers?

Title: Re: Cathode capacitor, do I need one?
Post by: Paul Joppa on February 09, 2010, 07:12:26 AM

That would probably work well. Return the output transformer to the cathode, not to ground, so that the bias resistor is not part of the midband signal current loop.