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Tube brand options for Ampeg SVT 2 Pro...

Discussion in 'Amps [BG]' started by Andybart, Dec 11, 2012.


  1. Does anybody know the best tubes to get for an Ampeg SVT 2 Pro? I'm in search of new power tubes for my amp and I'm not sure what the best option is for me. I've never owned a tube amp until the last few months and it is making some really weird noises which lead me to believe my power tubes (maybe more) are spent. If anybody has any insight on this I'd really appreciate it. Does Ampeg recommend Sovtek or Electro Harmonix or what?
     
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  3. chaosMK

    chaosMK Supporting Member

    May 26, 2005
    Albuquerque, NM
    Disclosures:
    Hi-fi into an old tube amp
    I think JJ KT-88's are pretty epic. Huge sounding with extra lows and slight compression. (at least through my 400)

    I have Tung Sol RI 6550's in two amps that I own and like them. They are a little flatter in terms of frequency response. I tried the TS because they were a little cheaper but am very happy with them.

    As long as your power section is biased right it should be all good.

    Noise... preamp is usually the culprit and a fraction of the cost.
     
  4. jastacey

    jastacey Supporting Member

    Feb 8, 2009
    Houston,Tx
    In the 2 SVT 11 Pro's I had over the years, I've always installed Sovtek 6550's power tubes ..... for the preamp & driver tubes I've used Sovtek & JJ's and Tung-Sol's
     
  5. Morning Beer

    Morning Beer

    Oct 2, 2009
    Cleveland
    I retubed a CL with EHX and was very happy with the results, cheap too.
     
  6. No need to splurge on tubes, all you need is something robust that can handle the screen and plate voltages. EH and Sovtek 6550/KT88 are good. Haven't tried the JJ 6550 but the JJ KT88 have done really well in my Matamp.
     
  7. stiles72

    stiles72

    Mar 20, 2009
    Albany IL
    Nothing wrong with Sovteks all the way around. If you felt like splurging on NOS tubes, I'd try a couple in the preamp. Tubes in general don't need to be replaced unless they go bad, so you may want to have your amp looked at and have the tubes tested.
     
  8. Thanks for the info! I guess I should've maybe explained the problem as well so that maybe somebody could help me determine if it needs to go in and be serviced or not. A few weeks ago my SVT 2 pro started making my speakers sound like they were blown (kind of a crackling undesirable sort of distortion) I tried the head through a few different cabs I have at our practice space and it made the same noise with all of them. Then last week as I was warming up my head on standby mode the standby/fault light started flashing between red and green and my amp is now shut down completely. I read in the manual that this most likely means a failure in the power tube circuit which is why I was leaning toward replacing the possible burned out ones or whatever.
     
  9. I don't know about SVT but Mesa suggest checking out resistors which can be taken out by tubes dying. Jimmy must be busy today.
     
  10. meatwad

    meatwad

    Apr 9, 2008
    Smallville, USA
    If power tubes are all you need, I recommend Winged "C"s. I have those in my SVT-CL, and love them. Compared to the original Sovteks, they sound bigger in the lows and tend to overdrive easier, but still incredibly loud.
     
  11. JimmyM

    JimmyM

    Apr 11, 2005
    Apopka, FL
    Disclosures:
    Endorsing: Ampeg Amps
    The chances of you having more than one or two blown tubes is low. Likely you have only one. You can buy a set of 6 if you want, but SVT power tubes are made to be matched and biased in triplet sets, so the cheaper option is to buy 3 and just replace the half that's got the bad tube. But yeah, I'd say you have a bad power tube. I'm no tech but that'll happen when you have a bad tube.
     
  12. Thanks, I think I'll just try getting half new tubes. SUPER expensive anyway for a whole set. Kind of wishing I hadn't tried out a tube amp and experienced how much better they sound than most solid states cause man it's expensive!
     
  13. JimmyM

    JimmyM

    Apr 11, 2005
    Apopka, FL
    Disclosures:
    Endorsing: Ampeg Amps
    Ever price a replacement motherboard in a solid state amp? ;) Any kind of amp can break and have a costly repair bill.
     
  14. Bassoballs

    Bassoballs

    Nov 14, 2009
    Mid Michigan
    I also recommend Winged =C= tubes. I use them in my 2 pro and feel they are more musical than the originals. They are a bit pricey, but I feel it is a worthwile upgrade.
     
  15. So those are the SED 6550C power vacuum tubes?
     
  16. Yes
     
  17. Red Planet

    Red Planet

    May 29, 2005
    Everywhere - All The Time
    Disclosures:
    OEM Manufacturing Supplier
    The best 6550's currently being produced anywhere on the planet are the Winged C's.

    =C=
     



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