The No.1 Website for Pro Audio
 Search This Thread  Search This Forum  Search Reviews  Search Gear Database  Search Guitars for sale  Search Gearslutz Go Advanced
Need help diagnosing VOC AC30 problem
Old 5th February 2013
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!

Attached Files

SG_Clip.mp3 (293.9 KB, 184 views)

Strat_Clip.mp3 (261.4 KB, 139 views)

Last edited by farawayradio; 5th February 2013 at 10:39 PM.. Reason: Typo
Old 5th February 2013
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
Gear interested

Thread Starter
That sounds like an easy fix. Thanks very much for the help!
Post Reply

Welcome to the Gearslutz Pro Audio Community!

Registration benefits include:
  • The ability to reply to and create new discussions
  • Access to members-only giveaways & competitions
  • Interact with VIP industry experts in our guest Q&As
  • Access to members-only sub forum discussions
  • Access to members-only Chat Room
  • Get INSTANT ACCESS to the world's best private pro audio Classifieds for only USD $20/year
  • Promote your eBay auctions and listings for free
  • Remove this message!
You need an account to post a reply. Create a username and password below and an account will be created and your post entered.

Slide to join now Processing…
Thread Tools
Search this Thread
Search this Thread:

Advanced Search
Similar Threads
Thread Starter / Forum
sonicdom / Geekslutz forum
museician01 / Music Computers
emeline-rec / Music Computers
Reggie Love / Remote Possibilities in Acoustic Music & Location Recording

Forum Jump