Will Tung Sol 6550 Fit Ampeg SVT CL?

Discussion in 'Amps and Cabs [BG]' started by leemelone, Nov 18, 2016.

  1. leemelone


    May 24, 2011
    It's time for re-tube and I'm concerned about them fitting in my SVT CL without any modifications. The body seems a lot fatter and I'm worried about having enough clearance between the tubes and if the tube holder springs will fit.
  2. beans-on-toast


    Aug 7, 2008
    Yes they will fit. This tube store recommends this tube as part of their premium package: Ampeg Heritage SVT-CL - Ultimate Package (Heritage and CL are the same in terms of tube positioning).

    Although they fit, because the tube is a coke bottle shape, there is less space between the tubes and this affects cooling. Many have used these tubes without any issues though.

    The retainer springs are also tight against the tube. They can rattle with either tube type. If they do, slipping a length of high temp silicone tubing over the spring fixes it. Loud also sells the vintage style clamps that are used in the Heritage model. They can be retrofitted, there is also a Youtube video showing how to install them.
    jastacey likes this.
  3. jastacey


    Feb 8, 2009
    I did the retrofit power tube clamp on my CL-SVT, very easy upgrade, I personally would go with the Sovtec 6550's

    17902290608_30079a19d5_b.jpg 20150525_131057 by Jessica Stacey, on Flickr
    Last edited: Nov 19, 2016
    beans-on-toast likes this.
  4. JimmyM

    JimmyM Supporting Member

    Apr 11, 2005
    Apopka, FL
    Endorsing: Yamaha, Ampeg, Line 6, EMG
    I'm happy with the JJ's in mine, personally. And not to brag, but my Heritage was the very first amp made using those newer low profile power tube clamps, and I would most definitely get some and swap out those weird spring contraptions.

    beans-on-toast likes this.
  5. okcrum

    okcrum in your chest

    Oct 5, 2009
    Verde Valley, AZ
    RIP Dark Horse strings
    :thumbsup: on switching to tube base clamps. No more spring buzz either.

    The Tung Sol 6550s worked fine in my SVT-CL and sounded great.