Need help diagnosing VOC AC30 problem
Old 5th February 2013
  #1
Gear interested
 

Thread Starter
Need help diagnosing VOC AC30 problem

Hey everyone,

I'm hoping somebody might be able to help me diagnose a sound my Vox AC30 CC2 has been making lately. I've owned the amp for about five years with no issues, using it mostly at home and rarely playing it at higher volumes until recently (I'm wondering if this might be the cause).

I've attached a couple of short clips so you can hear what the problem is. It's sort of a high-pitched rattle that happens as a note is receding. This is the first tube amp I've owned, and I'm pretty unknowledgeable about its inner workings.

Before I haul the amp down to the neighborhood repair shop, I was hoping to figure out what the problem might be and what I'd be looking at in terms of a repair cost.

Thanks for any help!

Farawayradio
Attached Files
SG_Clip.mp3 (293.9 KB, 76 views)
Strat_Clip.mp3 (261.4 KB, 53 views)

Last edited by farawayradio; 5th February 2013 at 09:39 PM.. Reason: Typo
Old 5th February 2013
  #2
Gear Head
 
sheltone60's Avatar
 

One of your preamp tubes is microphonic. You can identify which preamp tube is microphonic by turning the amp on like you were going to play through it and then tapping each preamp tube. When you get to the one that is microphonic, the tapping noise will be loud. Replace that preamp tube and you'll be good to go.
Old 6th February 2013
  #3
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That sounds like an easy fix. Thanks very much for the help!
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