[DigitalNoMore]

I'm fully aware of the fact that the amplifier I built is the audio output stage of a typical 1960s television. As a result the PCL82 triode-pentode it uses can be picked up for not much money and I wanted to see how cheaply I could build a usable valve guitar amplifier for home practice. I used an old wall wart isolated supply for the valve heater and then stepped this up to the HT supply using a DC-DC step up converter bought for £5 from China via Ebay.
As I stated in my original post, I used a single transistor treble booster in front of the amplifier I built because it wasn't really sensitive enough without it using either my Fender Stratocaster or my Antoria Les Paul (fitted with high output DiMarzio pickups). The sound was also very flat and muddy without the treble booster.

I've no interest in arguing. Just passing on the experience I had in case anyone else decides to build it or use an old radio with a similar output stage.