what tubes for 63 vibroverb clone

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by windjamma, Feb 13, 2012.

  1. windjamma

    windjamma Member

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    Hi guys would like your opinion on what tubes for a brownface vibroverb.

    the amp in question is a headstrong verbovibe.

    What current production would you recommend, it currently has all electro harmonix 12ax7 in the pre amp and jj 6l6 and gz34 in the power amp

    Does not sound bad in anyway with these tubes but i am getting a bit of tube noise so would like to replace them.

    thanks in advance and best wishes

    ps any nos advice would also be appreciated if i can find some for a reasonable amount
     
  2. big mike

    big mike Moderator - EL34 Emeritas Staff Member

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    Nos...
    RCA's for the preamp, and GE's for power and Recto.

    cheap(er) nos...get some RCA, GE and Raytheon mix and roll through them. Check the schematic and just change the tubes that impact the preamp. V1 of each channel for example. GE Power, and I still say a good solid reliable recto NOS.

    New stock...I like the tungsol 6l6GCSTR and Tungsol preamp tube.s
     
  3. Blue Strat

    Blue Strat Member

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    It's probably worth asking what you consider a reasonable price for the retube before recommending things that are out of range. What a lot of guys do is use some new production and some NOS tubes to keep sticker shock to a minimum.
     
  4. windjamma

    windjamma Member

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    Thanks for the replies gent's.

    was reading your site mike and i see you recommend the EH 12ax7 for modern production.

    was thinking after reading through the recommendations, maybe a mix of nos and current production.

    anythoughts on the tad 6l6gc's ?

    will look for some ge power valves but kinda rare here in the uk.

    and a good recto for longevity reasons.

    thanks and best wishes.
     
  5. pfflam

    pfflam Silver Supporting Member

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    When I had a 63 RI I tried as hard as I could to get cleaner tones - I found GE and RCA old stock in the pres and str387 in the power - I also tried 5881 in the power and they surprisingly sounded pretty good but I think they are rated for less power -
     
  6. Blue Strat

    Blue Strat Member

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    TAD 6L6WGCs are a good option at that price point.
     
  7. big mike

    big mike Moderator - EL34 Emeritas Staff Member

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    I'd be all over some NOS 5881 TungSol if I had one.
    Break up a tad earlier, those tubes are like bulletproof and sound GREAT.

    I think Somoene has em on special (ANOS Deal...Cough Mike) when I looked at his site last...
     
  8. Krayon

    Krayon Senior Member

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    honestly.. does anyone still believe that whatever NOS is left these days,

    is STILL better than the current stock?

    I mean we have been picking the bones of that Stuff since the late 70s.
     
  9. big mike

    big mike Moderator - EL34 Emeritas Staff Member

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    Have you directly compared?
    I have
    Yes it is.
     
  10. Blue Strat

    Blue Strat Member

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    What does that have to do with anything? There's still a lot of fresh stuff out there. I've got over 20,000 of them in stock.

    Obviously there's less every day and someday it will all be gone, but not yet.
     
  11. Krayon

    Krayon Senior Member

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    the phrase NOS tubes has been thrown around now since before I started building amps 20 year ago

    at some point I gotta think, its snake oil. why not just build useing new stock and forget trying to work with old stuff that may or may not be up to snuff.

    case in point.. long time friend who has an amp I built him for him about 8 years ago.
    he comes to me with a pair of RCA black plate 6L6s that he paid a mint and half for
    that hes scream'in at me that the amp I build ( and he has been playing for 8 years) is a POS because his new $$$ tubes sounds like crap in..

    so i check them. by tube tester they test fine with my B&K model 747

    but in the amp circuit they go into thermal runaway in seconds.. At ANY bias point... this pair is not a good tube for THAT amp. so hes all down on my skills because someone else tells him that these are the finest tubes on the planet.. blah blah blah the amp must be a POS.. yet, it sounds fabulous with a set of JJ or EH or TUNG-sols or even MY personal set of Short Bottle Tung-sol 5881s

    I'm just thinking that we gotta be hitting the dregs by now.
     
  12. big mike

    big mike Moderator - EL34 Emeritas Staff Member

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    I'm sure we're getting close
    And in certain cases I agree the expense isn't worth it.
    There's also some good sounding current stuff

    Most of my amps have a mix.
     
  13. Blue Strat

    Blue Strat Member

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    Cool story bro. One pair of bad tubes means that the other 2 million are also bad. Nice "scientific method" at work there. :aok :D
     
  14. Timbre Wolf

    Timbre Wolf GoldMember Supporter Gold Supporting Member

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    Oh hell yes!! Come on up from under that rock already. :rotflmao

    - Thom
     
  15. big mike

    big mike Moderator - EL34 Emeritas Staff Member

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    Simmer down Mikey.
     
  16. Blue Strat

    Blue Strat Member

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    Seriously? That was about as tame as it gets when responding to someone disseminating BS. All in good fun too. :)
     
  17. big mike

    big mike Moderator - EL34 Emeritas Staff Member

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    Just giving you hell. :p
     
  18. Blue Strat

    Blue Strat Member

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    :D..
     
  19. windjamma

    windjamma Member

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    hey guys i bought a couple of nos 12ax7wa ge and i have a question for mike, on the top of the valve the flashing i think, the silvery stuff on the inside there is a hole at the top by the nipple( ie no flashing ) in the flashing is this ok, or should i send them back.

    thanks and best wishes
     
  20. Timbre Wolf

    Timbre Wolf GoldMember Supporter Gold Supporting Member

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    I'm not Mike, but it sure sounds okay by me. From your description, the rest of the getter flash is intact and doing its job.

    I've seen lots of tubes, including the excellent Raytheon black-plate 12AX7A, have a darkened spot in the getter flashing where the heater filament has probably caused the discoloration.

    - Thom
     

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