#1
I am having an issue with my VOX ac15. It turns on and all the tubes glow. HOWEVER, the sound is really really quiet. It picks up a small signal and if I turn the master volume all the way up and the top boost volume all the way, some sound comes out of the speaker but hardly any. Any suggestions? I'm thinking about buying some new tubes, but other than that, I'm STUMPED!
GEAR


VOX AC15 / AC4
Fender MIM Sunburst Strat
epiphone les paul custom in white
Yamaha FG730s
The Tweak-O fuzz pedal
#3
yes! I've tried a handful of combos (les paul, strat, ibanez, and various input cables)
GEAR


VOX AC15 / AC4
Fender MIM Sunburst Strat
epiphone les paul custom in white
Yamaha FG730s
The Tweak-O fuzz pedal
#5
since the summer...it hasn't failed me and then one fateful day at band practice it started sputtering and then stopped working and it hasn't worked since
GEAR


VOX AC15 / AC4
Fender MIM Sunburst Strat
epiphone les paul custom in white
Yamaha FG730s
The Tweak-O fuzz pedal
#8
Quote by forsaknazrael
It's possible it's the power tubes. Replace them with some JJ EL84's, see what happens. Let us know.


ginx 12345. You owe me a coke
#10
Quote by forsaknazrael
...fail. It's spelled "jinx".


No, I'm talkin about somethin entirely different.

I knew it didn't look quite right, after it went up.
#11
would there be any visible signs that the tubes are bad?
GEAR


VOX AC15 / AC4
Fender MIM Sunburst Strat
epiphone les paul custom in white
Yamaha FG730s
The Tweak-O fuzz pedal
#13
I replaced the tubes...and it STILL does not work! ****!!!
GEAR


VOX AC15 / AC4
Fender MIM Sunburst Strat
epiphone les paul custom in white
Yamaha FG730s
The Tweak-O fuzz pedal
#15
Quote by forsaknazrael
Not always. volume fluctuation is a symptom of bad power tubes, though.

every time ive had volume flucuations (3 or 4 times now) it has been due to a bad preamp tube.
Quote by BryanChampine
It was like a orgasm in my ear.
Chea_man is the best.
#16
arghhhh I swapped ALL the tubes (with Groove tubes for the record) and it still isn't working. This isn't good. Any other ideas? The tubes are distorting the sound but it is extremely quiet. I'm at a loss, especially considering I have a show on Sunday to play...AHH
GEAR


VOX AC15 / AC4
Fender MIM Sunburst Strat
epiphone les paul custom in white
Yamaha FG730s
The Tweak-O fuzz pedal
#18
Quote by mju4t
arghhhh I swapped ALL the tubes (with Groove tubes for the record) and it still isn't working. This isn't good. Any other ideas? The tubes are distorting the sound but it is extremely quiet. I'm at a loss, especially considering I have a show on Sunday to play...AHH

That is quite aggravating. Do you know an amp tech that lives near you?
#19
Quote by MAYNARD
Do you not have to rebias?


No, AC15 is cathode biased.

TS: You need to see an amp tech.