6V6, IMO, is always a good choice for a guitar amp, unless you need to fill a stadium with sound.
Paralleling the tubes gives a smoother sound, since you don't cancel the even harmonics. It also halves the plate impedance, which is fairly high with 6V6 (8 to 10K ohms each tube) and doubles the power output over a single tube in class-A.
But, with parallel, like the Gibson mentioned, you are still limited to class-A. Push-pull will give you a little more design flexibility and more power (15 watts RMS or so), but will sound different. The output transformers used are also different. SE and PP are wound and have their cores stacked *very* differently.
If you can, breadboard both SE and PP and see which you like
If anyone is wondering about a GA-9 schema, here's one: http://www.rru.com/~meo/Guitar/Amps/Gibson/GA9/Images/ga9.gif
Paralleling the tubes gives a smoother sound, since you don't cancel the even harmonics. It also halves the plate impedance, which is fairly high with 6V6 (8 to 10K ohms each tube) and doubles the power output over a single tube in class-A.
But, with parallel, like the Gibson mentioned, you are still limited to class-A. Push-pull will give you a little more design flexibility and more power (15 watts RMS or so), but will sound different. The output transformers used are also different. SE and PP are wound and have their cores stacked *very* differently.
If you can, breadboard both SE and PP and see which you like
If anyone is wondering about a GA-9 schema, here's one: http://www.rru.com/~meo/Guitar/Amps/Gibson/GA9/Images/ga9.gif
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