It's been a long time I've had a look at what was available as DIY electrostatic amps. Is there anything decent one could build under 500$ (before casing) ? Preferably (but not required) with PCBs I could buy somewhere ?
I'm pondering whether or not help someone building one vs buying a stax amp and I'd like to have an idea of the options I could suggest.
Otherwise there's this schematic that has been tempting me for a while. But why reinvent the wheel and take the risk of blowing out a lot of parts if something decent is already proven and tested ?