Which Bassman Is The Best Circuit To Build?

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by donnyjaguar, May 19, 2015.

  1. donnyjaguar

    donnyjaguar Member

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    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?
     
  2. Blue Strat

    Blue Strat Member

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    BEST?!?!?! You're kidding, right? ;)
     
  3. donnyjaguar

    donnyjaguar Member

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    Nope! Give it to me straight, I can take it...
     
  4. Riscchip

    Riscchip Supporting Member

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  5. Trout

    Trout Member

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    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.
     
  6. Blue Strat

    Blue Strat Member

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    You've been here a while, right? It's like asking which color is best. ;)
     
  7. Trout

    Trout Member

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    Red tastes best on Sunday,, Mondays I love the taste of green or blue, NEVER yellow on Monday ;)
     
  8. 71strat

    71strat Member

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    I think you have it right with the 59 Bassman circuit.

    Ive got a Metro GMP45 which was copied/modded from the 5F6-A, and I would love a nice 5F6-A amp Head with 4 x 10 Fane AXA10's. 5E3 head would be nice too.

    Hendrix Voodoo Chile ( Slight Return ) was done with a 59 Bassman.
     
  9. donnyjaguar

    donnyjaguar Member

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    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.
     
  10. robrob

    robrob Member

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    gigs likes this.
  11. donnyjaguar

    donnyjaguar Member

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  12. skeeterbuck

    skeeterbuck Member

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  13. donnyjaguar

    donnyjaguar Member

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    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:

    5F6-A
    5E6
    and a later 1960's one.

    I welcome a suggestion here. Would like to stick to bone-stock circuits.
     
  14. 88bruce

    88bruce Member

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    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.
     
  15. gigs

    gigs Member

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  16. hasserl

    hasserl Member

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    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.
     
  17. hasserl

    hasserl Member

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    Man, post schematics when discussing circuits, layout drawings are for laying out the parts.
     
    mark norwine and pdf64 like this.
  18. jaytea4

    jaytea4 Supporting Member

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    Build one of each, it's just money. Love a 6G6A/B, AA864 or as stated above a tweed Bassman.
     
  19. HipKitty

    HipKitty Silver Supporting Member

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    When it comes to the BF realm, I prefer the AA864
     
  20. donnyjaguar

    donnyjaguar Member

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    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!
     

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