Prometevs wrote:ChrisAlbertson wrote:
What you mean is that I can use any amplifier schematic and then start testing, changing components until I'm satisfied. Is there any guidelines I can use for this?
Yes. Notice the hand drawn amp schematic that was posted. I think this was intended for HiFi. A guitar amp will try and boost the mid range and kill the highs and the lows. Choose a coupling cap that limits bass to 80Hz, same with cathode bypass caps no need for the amp to have gain in the low bass. and no need for highs past 8Hz
Also the schematic has only one triode gain stage. that is not nearly enough. You need at least two of those. Two 12AX7 stages will still give a mostly clean sound. You need at least one more (three total) to get into some seroius overdrive distortion.
A gutar amp with all that gain is prone to oscilation too. Limiting the baandwidth helps and also notice they use a longer multi-section power supply filter, one section per apir of triode gain stages. Guitar amps tend to be about twice as complex as hifi amps because of the complex preamps.
Between each stage you can play with coupling cap, cathode bypass, grid stop and miller capastance. to shape the tone. It is best to copy a know good sounding desing.
What I'd suggest is building your desiged output section with the power tube and OPT you have the them copying a preamp from the "building blocks" section of the ax84.com web site.
Youmight want a Fender/marshal style tone stack