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Basket of old tubes

Discussion in 'Glowing Bottle Tube Amp Forum' started by elihu, Nov 16, 2020.

  1. elihu

    elihu Poster Extraordinaire

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    DDF18199-DABB-4319-BA31-45EEFB520C81.jpeg Besides the 5y3 tubes is anything else useable?
     
    Last edited: Nov 16, 2020
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  2. Engine Swap

    Engine Swap Tele-Afflicted

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    6GC7 are worth some coin. Someone got to these before you....
     
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  3. David Barnett

    David Barnett Doctor of Teleocity

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    The 6CG7 is a good audio tube, often used as the driver in power amps. It's like a gutsier 12AU7.

    What are the ones without boxes, with the top caps?
     
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  4. schmee

    schmee Doctor of Teleocity

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    Seems like I've seen the 6GC7 somewhere. maybe it's a tube tester tube? I scored a bunch of NOS tubes in boxes, but no one wants all these oddballs. I cant sell them for even 50 cents each.
    [​IMG]
     
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  5. Guy Guyatone

    Guy Guyatone TDPRI Member Silver Supporter

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    The 1xxx, 2xxx, 4xxx, 5xxx, 7xxx, 8xxx, 10xxx, and 13xxx are all odd heater voltages, the 6xxx and 12xxx might be made to work in an audio application but are probably low gain or weird in some other way.
     
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  6. elihu

    elihu Poster Extraordinaire

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    I looked and all the Id markings were worn off.

    I used to be able to find all the preamp tubes but that’s getting harder to do.
     
  7. blues

    blues Tele-Holic Silver Supporter

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    You have two tubes that I can see that are used in guitar amps. 5Y3GT

    If that is what is in those boxes you "might" get 15 to 20 bucks a piece
     
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  8. elihu

    elihu Poster Extraordinaire

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    Yeah, that’s what I thought. And I’m thinking that Ampeg tube amps use the 6CG7?
     
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  9. David Barnett

    David Barnett Doctor of Teleocity

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    6CW4 is a Nuvistor with some audio uses, but not for guitar.
     
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  10. ThermionicScott

    ThermionicScott Poster Extraordinaire

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    Heh, I think most of us tube enthusiasts end up with bins of these oddball tubes eventually. If you're up for wiring in a different tube socket, the 7C5 is a 6V6 equivalent.

    Every so often, I daydream a little about designing an amp around all these sweep tubes and damper diodes, but there's no way to come out ahead in that scenario! :lol:


    P.S. Love your signature, @elihu .
     
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  11. slider313

    slider313 Tele-Afflicted Silver Supporter

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    The 6CG7 was used in Ampeg Gemini amps in the reverb section.
     
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  12. Dacious

    Dacious Poster Extraordinaire

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    6DQ6Bs - Aussie guitar amps like Goldentones, Moodys and Playmasters used them - TV sweep tubes, handle 700 volts. You can get 40-50 watts out of a pair - they don't sound quite like anything else but there's a tight fullness through period Plessey or Rolas.



    Like a big Vox on steroids

    Stick 'em on eBay should get $15-20 a tube. They're becoming harder to find in boxes.

    Never seen RCA branded ones

    images (65).jpeg
     
    Last edited: Nov 16, 2020
  13. VintageSG

    VintageSG Friend of Leo's Ad Free Member

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    The 6AK5 can find a use in headphone and pre amplifiers. It's listed as a viable substitute in a number of Little Dot amps and swaps directly for a 5654 or 6j1. If you want to sell them on Ebay, list a pair as suitable for such duties. Folk will pay big money to rid themselves of the stock 6j1
    The 6BK5 makes for a lovely little 3~4 Watt output valve. Stick with a 6~9K OT primary. It's easy to drive, heck, a 6AK5 would do it, and only requires a B+ of 220 to 250 V
     
  14. Engine Swap

    Engine Swap Tele-Afflicted

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    Sweep tubes in the output section seem a bit more common outside of the US.

    I have an old Braun CSV-60 that uses 4 PL500 in the output.

    [​IMG]
     
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  15. elihu

    elihu Poster Extraordinaire

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    Well I bought the two 5y3 tubes in the foreground for $1 each. I’ve already got two others but what the heck.
     
  16. Wulf

    Wulf Tele-Afflicted

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    thats handy to know
    put 12AU7 in a vox AC30VR and it transformed it
    now can you still get 6CG7?
     
  17. ThermionicScott

    ThermionicScott Poster Extraordinaire

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    My understanding is that 6CG7s were 6SN7s in a smaller package and derated a bit for voltage and dissipation. So they had a head start at being better than 12AU7s. :)
     
    Last edited: Nov 16, 2020
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  18. BobbyZ

    BobbyZ Doctor of Teleocity

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    My dad called me from a garage sale once and I ended up with enough boxes full of free tubes to fill the back of my Suburban. Out of all of those I got one shoe box of tubes that work in guitar amps. Mostly 5y3s and 5u4s, a few 12ax7s and 12sl7 or 12sn7s. They're all melted now.
    I still look at tubes for sale on CL and FB marketplace. But people always think they got gold, but all the nuggets are picked out.
     
  19. KS6V

    KS6V TDPRI Member Silver Supporter

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    The 6DQ6B sweep tube was used in a few old ham radios.
     
  20. drneilmb

    drneilmb Tele-Meister

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    Man I love weird old tubes. I've got a pair of 6146 RF power amplifier tubes waiting for something to do, but the real trip for me is that tubes aren't the worst part of acquiring parts for an amp build, transformers are. If you had a box of miscellaneous power and output transformers (with leads and ratings of course) then you'd be sitting on a real goldmine. :)
     
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