1. Please take 30 seconds to register your free account to remove most ads, post topics, make friends, earn reward points at our store, and more!  
    TalkBass.com has been uniting the low end since 1998.  Join us! :)

Is this possible, or am I being scammed?

Discussion in 'Amps and Cabs [BG]' started by eukatheude, Apr 1, 2014.

  1. I've put my eyes on an used Kustom DE 300 HD head. The asking price is right. The guy states in the ad that sometimes volume cuts out for a second or two, and says the fault is in the old, "tired" preamp tube. Since a new tube isn't much money, and what i'm reading of this head so far is convincing me, I'd quite inclined to splurge. However I think it's best to check with you folks! Could it really be just the tube or it could be a symptom of something far more troublesome? I contacted the guy for more info and I'm to call him this evening, is there anything specific you think I should ask about?
  2. CL400Peavey

    CL400Peavey Supporting Member

    Nov 7, 2011
    Grand Rapids Michigan
    I would avoid that amp. YMMV
  3. lfmn16

    lfmn16 Supporting Member

    Sep 21, 2011
    charles town, wv
    If it is a cheap easy fix, why doesn't he do it himself? I would pass because I don't know enough about amps to take a chance.
  4. I know a bit about electronics and I'd be able to swap out components if need be. But I've never worked on an amp before and I don't feel like taking chances either. I'm curious though, and I want to know what does he have to say on the matter.
  5. Dave W

    Dave W Supporting Member

    Mar 1, 2007
    White Plains
    Yes, absolutely.
  6. Can't be too much wrong or it would be dead.
  7. BurningSkies

    BurningSkies CRAZY BALDHEAD

    Feb 20, 2005
    Seweracuse, NY
    That's not a symptom of 'tube failure' there's something else going on.
  8. Thanks. I may be able to talk him down significantly on the price with this in mind. He's asking for 150 euros btw, but if I can snag it for cheap it's a deal. Even if I have to fix it.
  9. MrLenny1


    Jan 17, 2009
    If I were selling an amp with a simple fix issue I would certainly fix it
    before listing it.
    Buyer beware.
  10. Save your dosh and spend it towards a good cab. ;)
  11. Not much discount on a new one from Thommann. At 16kg it should be an oldschool amp and fixable but you want a far better price.
  12. I should add he states on the ad that, when the volume cuts out, the line output is still stable.
    Which doesn't sound right to me. If the problem is the tube (and assuming he's running the line out post-eq), how can the line out be stable? Maybe the issue is in the power section.
    Best way to check would be playing it through the power amp in / FX loop.

    Well it's 100 euro less. And he says no haggling. But I'm gonna haggle anyway.

    Heh. I want both a new amp and a new cab. If I buy this or any other amp, I can also sell my Ashdown combo for at least 200-250 and have more to invest in the cab.
  13. Zooberwerx

    Zooberwerx Gold Supporting Member

    Dec 21, 2002
    Virginia Beach, VA
    This is true. Riis's Rule of All Things Electrical and/or Mechanical: @#$& that's truly broken doesn't repair itself.

    Offer him a fraction of the asking price with the knowledge that the problem may reside elsewhere and bench fees are not cheap.

  14. You're onto it. If it's SMD boards you can give it away. If it's oldschool circuits a tech can probably fix it, accent on probably, so the price needs to reflect that. Mucho cheaper.
  15. I'd try to repair it myself if it dies. Always wanted to learn about amp repair.
    I doubt it's SMD but I'm sending a mail to Kustom to double check.

    I checked the owner's manual and that confirms my suspicion about the tube: http://www.kustom.com/Content/20103/DE300HD-OwnersManual-RevA_Final_31MAR2009ra.pdf page 9
    If the tube is faulty, why isn't the line out affected too? Doesn't matter if he runs it pre/post EQ as the tube is always involved.
  16. username1


    Dec 28, 2005
    alberta canada
    If it were just a simple fix like changing a tube I'm sure he would have done it already to get the best price from the amp. I think he's getting rid of it because of the problem.
  17. As I said, you're onto it, meaning you are correct, the power stage is corrupting.
  18. Yep. This however deprives him of the benefit of the doubt (if he was running the line out pre eq, and the tube was out of the circuit, it was still a possibility that the tube was malfunctioning).
    What do you mean by corrupting? Is it a general term for malfunctioning or you mean something specific?
  19. Cutting out.

    Over and out.
  20. Steve Dallman

    Steve Dallman Supporting Member

    Before I retired as an amp tech, I fixed amps for a Kustom dealer. Most repairs were store stock and turned out to be poorly seated ribbon cables. While I've never worked on one of these heads, I would assume it is something as simple as a tube reseat, cable reseat or tube change. I felt Kustom's designs were great but the construction is a bit under-robust.