Problem with a fender era Sunn 1200s

Discussion in 'Amps and Cabs [BG]' started by TomSchirmer, Feb 20, 2016.

  1. TomSchirmer


    Feb 19, 2016
    Hello! Im new here and i think that someone out there can help, a friend of mine had this sunn 1200s wich he wants to sell because he don't use it anymore, he says it has a problem but he dont know what is, the amp doesn't work, I check the pre circuits (wich is tube made) and it's all perfect, I believe that the problem must be in the solid-state part, hope it can he fixed, I love that amp.
    Anyway, can someone please tell me what can be the problem and if it can be fixed? Thanks to all

    Attached Files:

  2. Mr. Foxen

    Mr. Foxen Commercial User

    Jul 24, 2009
    Bristol, UK
    Amp tinkerer at Ampstack
    Doesn't work as in no output? Most of the preamp in this is solid state, probably should see if signal gets as far as effects loop, get at least something to work with.
    TomSchirmer likes this.
  3. jastacey


    Feb 8, 2009
    Did you try jumpering the effects jacks? ... ddi the amp take a hard fall?
    TomSchirmer likes this.
  4. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
    This is one amp that I recommend a really good tech for service. The power amp is quite complicated for a bass amp.
    TomSchirmer likes this.
  5. TomSchirmer


    Feb 19, 2016
    Thanks for the answer but I didnt have time to try yet, but the guy tells me that he cant get any sound
  6. TomSchirmer


    Feb 19, 2016
    I would had that in mind, thanks for answering!
  7. TomSchirmer


    Feb 19, 2016
    I havent try anything with it, he told me that it maybe got a punch travelling or so, what can be the problem if it had a hard fall?
    Thanks for answering
  8. The list of what could be wrong might overload this forum. Without a crystal ball or a lot more info from you or him you are really asking the impossible. Could be from cheap to the cost of a brand new high power current production amp or not repairable due to obsolete parts.
    TomSchirmer and Teacher like this.
  9. TomSchirmer


    Feb 19, 2016
    Youre right, but I dont know anymore since Im a noob in this hahah
  10. I would suggest that since it isn't working and
    sounds like that will be it's current state for some time
    that you either pass on it or see if you can get it REAL cheap.

    It could be anything from a simple broken solder joint to
    completely toasted.
    Before commiting to it, maybe you should find someone that
    has the knowledge to find out what it will need.

    I'd bet there is a tech out there somewhere that knows that amp inside and out.
    Maybe not local to you, but somewhere.
    TomSchirmer likes this.
  11. Teacher


    May 3, 2012
    Agreed. This is a problem for a good tech. As it is, the forum can't really help you. Sorry.
    TomSchirmer likes this.