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here is the schematic
Missing grid resistor on 6V6.
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this this tone/volume control setup
Odd, so odd that it may be mis-built, mis-fixed, or mis-transcribed.
0.005u coupling into 100K pot across the signal cuts-off everything below 350Hz, all the time. Huh?
0.01u cap, wiper turned to top, works against ~~30K plate node impedance to cut-off everything above 530hz.
Strongly suspect tone pot should be 250K-1Meg.
The intent is a simple treble shelf. This is useful with no-NFB pentode outputs and most speakers.... the speaker impedance rises above 500hz, pentode output rises, response is shrill. At the 1W level you can put a cap across the OT primary. At ~~4W level that's a sturdy cap, top-shelf in a low-level stage is cheaper.
Maybe compare to other Magnatone plans? I'd hate to see this become "just another Fender copy", the world has plenty of that.
This *appears* to be a
Varsity, which changed with every batch built, but the later 12AX7 job shows 1Meg tone pot (and topology similar to some Fenders; also a double-oh-one tonecap instead of oh-one.) (However with the higher-gain AX7 they took NFB from around the OT, so the tone-goal may have been different.)
http://magnatoneamps.com/schematics/magnatone_108.png
Both input jacks ground-switched? So if you only plug one guitar, you have a 2:1 cut-back at the input? Fender has only one finger-switch grounded so there is a 1:1 input or a 2:1 input. (The AX7 model does have all-grounds.)
The Melodier's tonestack is also of interest. http://magnatoneamps.com/schematics/magnatone_109_melodier.pdf