The Amp Garage

Good point, the OP doesn't say what amp this is. Dana, how about a trim pot in series with lug 3 of the VVR pot (between pot and B+ / drain connection) for limiting the maximum B+ available for someone using a transformer that puts out too high a voltage? Useful for someone using a transformer spec'...

. Personally I like the offerings from ST since some of them have the protection diodes built in (look for the Z suffix). For example the STP4NK60Z is a 70W, 4 amp, 600V device with diode protection built in. It costs $1.21. If you feel safer with a bigger power dissipation there is the ST12NK60Z w...

Is there a particular reason the NTE is used or just everyone copying off someone's schematic? I got some similarly rated MOSFETs for $2 each.

The capacitors you want to purchase are paper in oil or PIO capacitors. The 59 Les Paul had 0.022uF capacitors. The smaller the value of capacitor, the more treble you retain as you turn down the tone knob. You might want to try anything between 0.01uF to 0.022uF. I like 0.01uF in the neck position ...