I'm working on the final stage of my guitar amp. This stage needs to take the line-level signal (~1vpp-~2vpp) from the FX_RCV jack and swing it hard enough to drive the EL34 output tube. This stage of the amplifier is solid state to save on $.
I'm using an LND150 (500v depletion mode MOSFET) to boost the voltage and an IRF820 (500v enhancement mode MOSFET) to supply enough current to drive the output tube (when it goes into saturation).
When I fired the FX loop recovery section up, I had one resistor nearly explode (R29), and another smolder (R28) (Always wear safety glasses around high voltages!).
My wiring appears to be correct :( Is something wrong with my design around the LND150?
I figured it out! My wiring is so not correct! The gate on the LND150 is the middle pin, and the gate on the IRF820 is the left pin. This means ALL of my MOSFETs are wired incorrectly. I made the assumption that did not vary from the transistors I've used in the past vs these MOSFETs and the lesson is to RTFM!