ben.gardner
Registered User
Join date: Mar 2014
10 IQ
#1
I recently acquired a vox ac30cc2 and haven't been able to play with it because it will turn on and power up but when I plug a guitar in and try to play nothing comes out I have already replaced the rectifier tube and still no change. any help, or suggestions would be much appreciated
Cathbard
Grumpy Old Tech
Join date: Oct 2009
240 IQ
#3
The next place to look would be the preamp tubes (or phase inverter). If you do one power tube you will still get some sound out of it. You are looking at something common and fatal to lose and that means one of the small tubes. Buy one and try it in every position until you find the faulty one.
If it isn't one of the 12AX7's then you are looking at something on the board that's died like a capacitor or resistor and finding something like that is a bit beyond explaining on a forum.
Gilchrist custom
Yamaha SBG500
Telecasters
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100


Cathbard Amplification
My band
red.guitar
Imagine All The People
Join date: Mar 2007
160 IQ
#4
I had the exact same issue with mine.

For some reason with these amps if you turn the amp on to warm up with the standby on, it will store a charge, then when you turn the stby off to play the charge goes straight to the rectifier tube, killing it and the fuse It's a know major design flaw.

I'm willing to bet that you fried the rec tube and hts fuse (maybe the new tube too ). When I had this issue, I replaced the tube and fuse, then made sure to never use the standby switch again Just turn the amp on and let it warm up a bit before you play it instead of using the standby switch.

Hope this helps!
Guitars:
PRS Custom 24
Gibson Les Paul 60's Tribute
85' MIJ Strat
97' Snakepit Les Paul
LP Traditional 1960 Zebra
02' Dean TC Z

Amps:
EVH 5150iii
Peavey Ultra 112
Jet City JCA50H
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Peavey XXX
66' Bassman
ben.gardner
Registered User
Join date: Mar 2014
10 IQ
#5
ok ive already replaced the rectifier tube and all three 12ax7s and still no change
Cathbard
Grumpy Old Tech
Join date: Oct 2009
240 IQ
#6
Then it's time to try new power tubes.
Gilchrist custom
Yamaha SBG500
Telecasters
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100


Cathbard Amplification
My band
red.guitar
Imagine All The People
Join date: Mar 2007
160 IQ
#7
Quote by ben.gardner
ok ive already replaced the rectifier tube and all three 12ax7s and still no change


Like I said above, even if you replaced the rec tube and fuse, you WILL blow both the next time you turn the amp on using the standby switch! Trust me, 2 rec tubes and a pack of fuses later, I figured this out for myself


Don't use the damn stby switch!
Guitars:
PRS Custom 24
Gibson Les Paul 60's Tribute
85' MIJ Strat
97' Snakepit Les Paul
LP Traditional 1960 Zebra
02' Dean TC Z

Amps:
EVH 5150iii
Peavey Ultra 112
Jet City JCA50H
Peavey VTM 60
Peavey XXX
66' Bassman