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Crack the Code Amp build 1000 Watt Tube Amplifier

Discussion in 'Amps [BG]' started by Bass Battalion, Jan 18, 2014.


  1. Bass Battalion

    Bass Battalion

    Joined:
    Jan 5, 2014
  2. Mr. Foxen

    Mr. Foxen

    Joined:
    Jul 24, 2009
    Location:
    Bristol, UK
    Disclosures:
    Amp tinkerer at Ampstack
    Probably best talking to John Chambers. Mammothsounds who posts here is a mate of his too. He winds his own transformers, so if you want same components, gonna have to ask him anyway. Plus the schematic is there on the page, along with construction notes.
     
  3. headband

    headband

    Joined:
    Oct 18, 2013
    Location:
    Indiana
    Be careful with an amp that uses transmitting tubes - very high plate voltage capped to the top of the tube verses under the chassis. Transmitter tube amps can be awesome but were generally shied away from for commercial use due to the increased danger.
     
  4. Mr. Foxen

    Mr. Foxen

    Joined:
    Jul 24, 2009
    Location:
    Bristol, UK
    Disclosures:
    Amp tinkerer at Ampstack
    The SVT did OK though.
     
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  6. BassmanPaul

    BassmanPaul Gold Supporting Member

    Joined:
    Aug 25, 2007
    Location:
    Toronto Ontario Canada
    Have you ever built a tube anything??? I'm seriously scared for your safety!!! I've been working with tube electronics since I was around 13 or 14 and I would not even dream of attempting a build of this scope.
     
  7. B-string

    B-string Gold Supporting Member

    Joined:
    Nov 21, 2008
    Location:
    Lake Havasu City, Az USA
    Well the first release had it's share of troubles. The output tubes were changed to a non-exposed anode pretty quickly.
     
  8. Passinwind

    Passinwind Charlie Escher Supporting Member

    Joined:
    Dec 3, 2003
    Location:
    Columbia River Gorge, WA.
    For another approach to a truly BABA, check out this thread. I've played through it and it works well.

    [​IMG]
     
  9. JimiLL

    JimiLL Supporting Member

    Joined:
    Jan 26, 2009
    Location:
    Hunt. Co., New Jersey
  10. Mr. Foxen

    Mr. Foxen

    Joined:
    Jul 24, 2009
    Location:
    Bristol, UK
    Disclosures:
    Amp tinkerer at Ampstack
    2 band baxandall stack give more adjustment than the 3 knob fender style typical on most amps.
     
  11. T-Bird

    T-Bird

    Joined:
    Apr 29, 2007
    Location:
    Finland (Northern Europe)
    Hi.

    Welcome to TalkBass Bass Battalion.

    This would be the first thing that comes to my mind as well.

    IMO that's not the main reason.
    Up to 50KV is pretty easy to do, even safely.

    Transmitter tubes in general cost at least 10x what a general power amp tube does and the availability is 1/100th. Or worse.

    An added trouble comes from water- or oil cooling, PITA to substitute with anything less messy that has the same heat transfer capability.

    HUGE +1 for what Paul there said.
    I was a hair older when I started though.
    I also do have a pair of NOS QE08/200H's waiting for the time to design an amp around them (300W PP) and there's an offer for a quartett of TH5186 tetrodes (1,5KW each) still open ;).

    Be safe and have fun.

    Regards
    Sam
     
  12. AlexanderB

    AlexanderB

    Joined:
    Feb 25, 2007
    Location:
    Sweden
    There is definitely a market gap concerning 6kW tube amps, T-Bird! :smug:

    Storage room could be an issue, though. Not for the amp, but for the 20 or so SVT-810 cabinets that you would hook it up to. :bassist:
     
  13. CrashClint

    CrashClint I Play Bass therefore I Am Supporting Member

    Joined:
    Nov 15, 2005
    Location:
    Wake Forest, NC
    OMG, what a pair! :eek:

    Of transformers that is. :D

    [​IMG]
     
  14. Mr. Foxen

    Mr. Foxen

    Joined:
    Jul 24, 2009
    Location:
    Bristol, UK
    Disclosures:
    Amp tinkerer at Ampstack
    Do wonder how the power section overdrive on this sounds.
     
  15. Bassmec

    Bassmec

    Joined:
    May 9, 2008
    Location:
    Ipswich UK
    Disclosures:
    Proprietor Springvale Studios
    Back in the old days we just built up tube bass rigs by adding reliable 200 watt 4XKT88 slave amps.
    [​IMG]
    Thus nothing weighed more than could be easily carried or powered and the ht voltages where kept within reason.:bassist:
     
  16. T-Bird

    T-Bird

    Joined:
    Apr 29, 2007
    Location:
    Finland (Northern Europe)
    Hi.

    :), quite true on both counts.

    In all fairness though, that 1.5KW is acchieved with 100KV on the plates.
    If I pull the trigger on those babies and eventualy am able to build the damn thing that hounts my imagination, it'll be "only" between 5 and 10KV on the plates.
    Plenty of tube power in any case :cool:.

    Regards
    Sam
     
  17. Mr. Foxen

    Mr. Foxen

    Joined:
    Jul 24, 2009
    Location:
    Bristol, UK
    Disclosures:
    Amp tinkerer at Ampstack
    Also, those were wired up to only work with two cabs attached, because no single cab of the time could cope with 200w.
     
  18. B-string

    B-string Gold Supporting Member

    Joined:
    Nov 21, 2008
    Location:
    Lake Havasu City, Az USA
    100KV?? I used to build transmitters and our 25KW FM's plate supply was just under 9KV.
    Another consideration with transmitting tubes is they are mostly direct heater. Much higher heater current than the 1.9A KT88. I have a pair of 811's hanging around and the heater draw is 4 amps.
     

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