Hello all,
I have a Vox AC30CC that I just bought. It is used. It is a 2006. I have only had it for 3 days and it just started cutting out some. It happened after playing for about 20 minutes. I opened it up and wiggled all the tubes to make sure nothing was loose. While looking around, I saw that the top of the EL34s were a little brown on top. They are Electro Harmonix and the pre's are Sovteks.

I do not know a whole lot as I have never had an amp with problems (gladly).

Also, I noticed on the bottom of the tube sockets are a little brown or rusted looking. Nothing bad at all though.

Any suggestions on what the problem could be?

Do I just need to replace some tubes? And if so, which ones?

Or do you think it is a speaker connection? And when you say they sometimes have bad connections you mean the soldering right onto the actual speakers, correct?

Thank you soooooo much!

Hi,
re-tubing is a good idea... you shouldn't have el34's...I hope that the bias has not been changed......

i have the exact experience with my recently purchased, used, AC30CC2X. The volume seems to drop for no apparent reason and then comes back eventually. I read another blog that said to not use the standby switch and to allways leave this switch in the on position. I tried this 2) weeks ago and have not had a problem since

If your amp is a CC model that uses a Tube Rectifier......DO NOT use the SB Switch. Leave it in the Off Position and never touch it again.
No amp "needs" a stand by switch. But the SB in the CC models can/do/will spike the tube diodes so hard, that it causes them to fail.
Good Luck

No, I mean Off.
If the Stand By is On, the amp will not play.

Where can I get the electric circuit sceme for Vox AC30 CC?