Normally I'd say no, probably not, but the Vox trem, like everything else AC-series, is wonky and actually dicks with your bias voltage to produce the effect, or at least the classic Vox tremolo did. The driver tube is in the preamp, should be a 12au7. It could just be a fuse? Also, check your footswitch and any other switching apparatus they may have decided to stuff in there (I don't know if they added a way to toggle the trem on and off by hand, though depending on the footswitch connection you might be able to test it with another cable, or the relay from the G-Major if you still have it.)

Re: footswitches, I don't know who owns Vox currently, but it was Marshall for a while, and I have to say my experiences with Marshall's footswitches... Well, frankly, they were total shit. Like utterly useless.

It could be any number of things, really. Assuming it's not a dodgy footswitch, I'd say pull the chassis and take a look. Another annoying AC-non-feature: pulling the chassis to get at the tubes. So get used to it.

If everything's connected properly and doing what it should, you should notice the tremolo. It is not at all subtle.

Okay, never mind some of what I said there: apparently, according to Vox's site, the AC15 CC1 has a solid state rectifier, and the 'verb and tremolo are SS-driven as well.

Yo, the CC AC15, it only has the footswitch jack, not an external toggle as well? If so , maybe take a look at the footswitch itself, and if you have random footswitches from other maps or whatever, maybe plug them in and see if you get a different result.

Yo, the CC AC15, it only has the footswitch jack, not an external toggle as well? If so , maybe take a look at the footswitch itself, and if you have random footswitches from other maps or whatever, maybe plug them in and see if you get a different result.

Just gave it a shot with no footswitch (which by the way they sent me for free which was kind of nice) and either I am just not hearing it, or turning the trem depth and speed knobs cause only very subtle changes. The reverb mix knob works just fine, but I can tell little to no difference from the trem depth and speed knobs turned all the way down and all the way up.

I do have another 2-button that I use with the Tron, Ill give that a go.

The issue I had with the Marshall switches (this was really annoying with the TSL... especially 'cause it had a 5-pin DIN connector and wasn't cheap... well, price-wise) was that the individual stompybits would go under normal use- just plain fail- and the others would function fine. So you could change channels and not turn the loop off, for example. And I had one shipped to me pre-broken right out of the box once. Usually you could tell though, as it wouldn't make a proper stompy click! and the feel was off.

Yarr, i am thinking that with no footswitch, it might default to "off".

And that a footswitch might be required in the AC15 version to turn it on.

And that your footswitch might be the problem. Which would actually be good, because it is much easier to mail the switch back to them than the whole amp.

Hmm, well then, it seems perhaps likely to either be a loose connector from the switch/trem controls to the poweramp bias, or perhaps the switching BJT, or the trem mosfet itself might be toasty.