The Amp Garage

I'm open to correction since I don't post here much, but it seems to me that 25V of bias is REALLY high for EL84's. What is the measured value of your cathode resistor? Installing a ground isn't hard to do. You should first check to see if any of the grounded plugs in your place actually have the gr...

I can't say what was in the interview. But as I've considered and evaluated the Express design, I think the point is to let as much bass through as possible since it's rolled off hard earlier in the amp. The idea being that bass is gradually increased as you move toward the ODing stages. This way yo...

Since the NFB loop is a voltage dependent circuit, and there is more voltage at the 8 ohm tap than the 4 ohm tap, if all component values remain the same there will be more NFB using the 8 ohm tap.

I read an old thread where there was some discussion about how to get two different switchable volumes from an Express type build (or I guess ANY cranked up amp). There was a lot of "you get what you get and that's it" type thing. Glen suggested the UA with the dual master mod. But it can be much ea...