Skunkie and Forum,

I just built the EL34/12AX7 amp and it sounds really good. Thanks for everything you do to help us with this Hobby Skunkie!!! I am interested in trying to learn more about how to tune it for my preferences. Although with all the work you did it may be the best version as it sits.

I have it set up to switch between two different Schade resistor values and I was wondering if I can disconnect the Schade feedback completely while the amp is running or if I need to power down first. In reviewing the circuit I can't think of a reason I would need to power down unless it would cause a current/voltage spike. I'd like to do this to understand better how the amp sounds under different configurations. It is hard to compare if you have to remember the sound between subsequent power cycles. Does anyone have experience with a mod like this?

I am also planning to add the ability to change out the driver tube for 6-volt tubes like the 6AQ8 and 6DJ8. I plan to add relays and have the configuration controlled by a microprocessor. It would switch the heater wiring and required loads in/out.

any input would be appreciated!