Tube Amp Archive

Whichever way I go, there will be a volume control before the first stage with the lowered voltage. I.e. pre PI MV if PI is included, post PI MV if only the KT66s are included. Although the question is not as simple as the standard pre vs post PI MV debate. PPIMV alone without VVR will only retain t...

I'm planning to build an amp very similar to the JTM45 (at least for the phase inverter and KT66 poweramp), but it will have a VVR/Power scaling circuit. I was wondering what people's opinion was on whether this amp would sound better (when the power's turned down) with just the poweramp on the cont...

Thanks rp, that's an incredibly useful answer! I'll go read your thread right away. I'll probably go for the 5F1, partly because my own DIY amp gets all of its distortion from pentodes (unless I use a pedal to overdrive the input triodes) and frankly if you push pentodes too hard without triodes to ...

As I say, I've built a more complex valve amp before, of my own design with 2xECC83, 1x EF86, 1x EL34 and 1xEZ81. That was a turretboard. I've drawn up tag strip plans for both revisions and I shouldn't really have any problems with either, since there's so few components. My only problem is chosing...

Hi all, Appologies if we're not supposed to discuss cloning here, but I don't see it written not to anywhere. I'm contemplating cloning a champ and I wondered if I could get some opinions on which revision to clone. The most popular 2 seem to be the 5C1 and 5F1, the difference mainly being that the ...