Anyway, when the amp arrived I gave her an inspection, clean-up and retube with a set of new.
She was now ready to be fired-up.
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The process of making all these modifications to sculpt the clipping response and timbre of the amp was like chasing shadows.As the amp warmed up she began to hum.The work required a certain dogged persistence to make any headway, however after several hours of tweaking and listening my Champ 12 was slowly beginning to shine.Print, print page 1, rename the bookmark, delete from my manuals?But maybe this Champ 12 was a good amp born in a bad time.Always scan any information downloaded from the internet with an up to date virus scanner before opening the downloaded information.The modified Champ 12 will never really work for high volume level gig situations, but it does make an excellent high calibre recording amp.This Website contains a compilation of information already available elsewhere on the internet and therefore considered to be in the public domain.Disclaimer, brand names and product names are the property of their respective owners.A few resistor and capacitor changes here and there might just open up the sweet spot and make the Champ sing as a tube amp should.With this in mind I uprated the power supply smoothing capacitors to reduce mains hum.
This schematic shows the mods made.
This wasnt a big deal and just involved popping off the red knobs and unscrewing the nuts that secured the pots and jack sockets.
The result of my labours was a beautiful sounding and quite useable little amp for practice, recording and testing subminiature tubes!
No, not impressed at all.
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Although it was only going to be utilised for test purposes, I could not resist the challenge of getting under the hood to perform some fine-tuning, make a few modifications to squeeze some extra performance from this little amp, after all, hot-rodding tube amps.