Jump to content
Why become a member? ×

Ampeg SVT IIP Preamp.


steve-soar
 Share

Recommended Posts

Hi Bass chatters. I have an Ampeg SVT IIP preamp that has served me well in the past, but it has developed a fault. Playing through it before into my power amp, then into my cab, it started to loose gain and start sounding scratchy. I swapped basses, still the same problem. I swapped preamps, then no problem. I have discounted basses, leads and the power amp, so the problem lays with the Ampeg
As I say, it started to loose volume,ie gain strength. As well as getting quieter,then getting louder, then starting to sound scratchy.

Any ideas as to what could be the problem?

Thanks in advance
Steve.

Link to comment
Share on other sites

Dont know that exact model but my first check would be any signal interrupting jacks like send and return loop, headphones jack or similar. When the fault is there is it effected by tapping the aforementioned jack sockets. If so then they need replacement or may respond to a bit of cleaning or repeated in and out therapy.

Also I have worked on a couple of ampegs this year with bad solder joints from the factory. This can give the same symptoms as the amps warm up the joints go bad.

Link to comment
Share on other sites

I would recommend a full service as these do suffer from solder joints going bad on all the front panel connections to pots and switches. If I remember correctly it's a ballache to change the valves too. If your not sure what your doing get it to a proper tech, it is valve so watch out for nasty voltages lurking in the filter caps. None of it is particularly difficult, it just needs a lot of care and much dismantling. Good pre amp when working.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...