Going To See A 1959 Reissue Tomorrow... Snagged!

Discussion in 'Let's Talk Vintage' started by Geeze, May 11, 2018.

  1. Geeze

    Geeze Well-Known Member

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    Yes, I know it's loud. I want it so. I have a 1987 and I want its big brother - yes it's a compensation thing...

    It has a loop so it's one of the later series reissues. Are there any gotchas to look for? Other than it's not an original gotchas that is. No extra knobs or holes from the pics. Shell not too beat up - I'll build one.

    Thanks for the input.

    Russ
     
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  2. GuitarIV

    GuitarIV Well-Known Member

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    Get earplugs. Be prepared to talk to cops. Buy a sixpack for every neighbour. And last but not least: rock.
     
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  3. Geeze

    Geeze Well-Known Member

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    Thanks @GuitarIV . Have ear plugs, will travel. The guy has a rockcrusher into a 1960A with 75's. So I can push it to hear some grind. Other than checking the noise floor this is a done deal unless it smokes...

    I have an 18,000 sqft shop for after hours blasting. I need more greenbacks!

    Russ
     
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  4. liontato

    liontato Well-Known Member

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    Russ, if you buy it we need a clip eventually....preferably in the 18,000 sqft rock cave.
     
  5. Geeze

    Geeze Well-Known Member

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    @liontato that's a whole 'nuther can o' worms. I have zero recording gear and spent some time talking to the Universal Audio rep at the last show regarding their OX system. Me so horny. Not exactly a live room recording setup but one I could use at home and keep the townhouse neighbors blissfully ignorant of the 600 watts worth of sonic destruction lurking in their midst.

    I have to dump a couple of amps and empty speaker cabs to acquire that bit of kit.

    Russ
     
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  6. liontato

    liontato Well-Known Member

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    Well just your summary will do for now once you get it. I’m sure it’s a beast.
     
  7. GuitarIV

    GuitarIV Well-Known Member

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    Jesus man, enjoy! I remember the feel of the endorphines rushing through my body the day I cranked my 2203... better than sex.
     
  8. ampmadscientist

    ampmadscientist Well-Known Member

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    You need to upgrade the "humdinger..." that's the pot that fails. This was the only bad thing about reissues.
     
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  9. ampmadscientist

    ampmadscientist Well-Known Member

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    Actually:
    it triggers the same chemical in the brain as sex does. (this has been studied by scientists).
    Now you understand...
     
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  10. jmp45

    jmp45 Well-Known Member

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    I have a 96 SLP, no loop. That and my 69 1987 tie for first. You won't be sorry if it's anything like my SLP. I removed c17 & c18. Didn't snip in case I want to restore. I have no idea what the humdinger mod is, if it's a pot issue, mine doesn't suffer from it.
     
  11. Geeze

    Geeze Well-Known Member

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    Unfortunately the test run has been put on hold for a few days. I'm already contemplating the next cab build madness.

    Russ
     
  12. grainman

    grainman Active Member

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    its the humbalance pot on the circuit board wich is sensitive to power surges or shorted tubes...one may bypass it with 2x resistors ( values?? )...
     
  13. grainman

    grainman Active Member

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    PS.. this trouble happened to me twice in all...even once repaired and modded, it striked me once again!! ...you have to put strong tubes in these amps....shorted tubes did damage these 2x resistors...since then, i use jj el34 only (as suggested by a tech...jjs or n.o.s el34 are tough enough for the high voltage of the 1959) no more problems occured even if played/abused on a regular basis since...its a great amplifier with tons of power !!
     
    Last edited: May 13, 2018
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  14. jmp45

    jmp45 Well-Known Member

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    K, makes sense. There is only one trim pot on my SLP board. VR1 used for bias adjust, no others. Board is tagged 1959SLP-60-00 2345. I'm running 6CA7s, EH most likely IIRC.
     
  15. ampmadscientist

    ampmadscientist Well-Known Member

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    I actually think there is a bad circuit track, or a bad component which causes this.
    Which circuit track we do not know yet.

    I think high voltage is leaking into the filament circuit.
     
  16. ampmadscientist

    ampmadscientist Well-Known Member

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    Yes
     
  17. ampmadscientist

    ampmadscientist Well-Known Member

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    The humdinger is the filament hum balance pot.
    The pot is replaced with fixed resistors.
    However, there seems to be an underlying cause, which has not been addressed or identified.

    (the exploding pot is the symptom)
    (replacing the pot with resistors is the band aid)

    It actually seems like somewhere the high voltage is arcing into the filament...

    [​IMG]
     
    Last edited: May 13, 2018
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  18. jmp45

    jmp45 Well-Known Member

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    Make sense. I'm good, my early version slp only has one trim pot for bias.
     
  19. GuitarIV

    GuitarIV Well-Known Member

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    It certainly did feel like I had an orgasm hahaha
    It's amazing what a roaring amplifier, playing an instrument and music in general do to people. I think it's truly a gift from god.
     
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  20. Yugedrums

    Yugedrums Active Member

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    Mine too (a 2000 model).

    I have two schematics for the 1959 reissues... one dated 1992 and the other dated 2002. My 2000 model follows the 1992 version, which has only the bias trim pot at V1 and has no V2. The 2002 schematic shows the V1 pot (bias) and V2 pot ("exploding" hum balance). It also includes the effects loop schematic, that the 1992 version doesn't have (like my 2000).

    I'm glad mine doesn't have the V2 pot, but if it did I'd be doing the resistor replacement AMS recommends.
     
    Last edited: May 18, 2018 at 3:01 PM
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