I fixed an M15MK1 by replacing the shielded wiring to the output tubes by unshielded ones...

I bought one ( € 1!) a few years ago, it's a rangemaster clone, but the resistors are different, base resistors are 6k8 to -, and 10k to ground, collector resistor is 4k7 , emitter resistor is 1 k. The input capacitor is 2 capacitors in series, both 10 N. There are 2 outputs, one is the cable, outpu...