Voxman or any other Vox folks out there, can i get some advice please?
I'm new to the forum but I think may had a similar problem on my AC50CP2...
I was at practice last week and the volume suddenly dropped. The amp was not entirely silent, I could hear my guitar... but only just. There sound was not distorted - it was my normal guitar sound just very very quiet. Same on both channels. The problem persisted for about 5mins. I checked my cabling and after some un-plugging and plugging back in, the volume came back (immediate, no fade). I put it down to a dodgy cable somewhere.
A few days ago I was back at practice when, after about an hour of playing I had the same problem. After 10mins or so of checking with cables I figured out that there was something amiss with the amp.
I've been playing today for several hours with the FX loop unplugged and just a guitar straight into the input and I've had no repeat of the problem.
I was worried that this might be something complicated like a transformer/rectifier problem, but I'm mystified why that would be an intermittent fault. I was all set to change out the valves to see if that would fix it, but I'm reluctant to do anything unless I can get it to go wrong again! Besides, the amp is barely 18months old and had been well looked after, despite quite a lot of use and gigging - I wouldn't have thought the valves would be on the way out?
After reading the post by fuzzydog, I wondered if this might be dirty connectors in the FX loop. But it seems unlikely to me - I'd have expected the volume to cut completely?
Any ideas what this could be?
Grateful for any help,