Howdy all, I have all the parts to create yet another amplifier using a pair of 6L6 tubes and some 12AY7. I'm thinking 1959 Bassman here. My question is, which is the definitive "best" circuit I should be considering?
It really depends on the goal/tone you are looking for.
The 58-60 5F6-A is the most widely accepted, duplicated & modded into hundreds of variations.
That said, Some of the other Bassman circuits share a different basic ancestry.
The 55 5E6 is similar topology in many ways to other earlier models like the Bandmaster.
They do sound different, very pleasantly so I might add.
5F6-A it is! My aim is just to build something different than what I've done already (Marshall, Hi-Watt, Fender, own custom x10, 18Watt, etc). Will it sound just like a '59 Tweed? I dunno, but its worth a shot I reckon.
I've decided that I'm going to build three Bassman amplifiers in one head. You see I have these surplus commercial networking selector switches that can switch 9, 15 and 25 circuits between 3 positions - nice! So here are my thoughts on circuits:
and a later 1960's one.
I welcome a suggestion here. Would like to stick to bone-stock circuits.
The circuits prior to the Blackface amps have an out of spec heater/cathode voltage on the cathode follower,
I don't know if that's the reason for the later change. A voltage divider off of the B+ line into the center tap
of a separate filament transformer for the preamp tubes can be used to correct this.
Just checking in to see how things are going around here, nice to see some familiar faces still hanging around. Having worked with quite a few Bassman circuits, including the 5E6A, 5F6A, AA864, AB165, and different combinations, my preference is the 5F6A, it's pretty hard to improve on it. Haven't messed with the blonde amps though, so maybe something there. I just like the tweeds, and of those I prefer the 5F6A.
HipKitty I think you have it right. I serviced an AA864 a while back and didn't want to give it back to the client after "testing" with my Strat. Switching from VT to SD rectification is going to call for a relay, but no biggie here given the complexity of the circuit regardless. Thanks for everyone's input!