I've found the Vox AC15 to be a fine gigging amp for a wide range of applications. I've read about various mods that people have done over the years, but I've only ever done a single one: remove the bright caps. The tubes have been replaced over the years (JJs), but everything else is stock. I've toyed with the idea of changing the speaker, but the greenback sounds just fine. I'm curious to hear what others have done (or not done) to get the most out of this amp. What has worked for you? Here are a few I've heard about: - Cut bright caps: the only mod I've done, and it made the amp much better. A few quick snips to remove three caps and it's done. This removed some unpleasant highs that made this amp hard to dial in. Now it sounds good almost all the time. - Add a bright switch: A mod I've thought about. Like on a BF Fender, it could be nice to have a switch to add the bright cap back in sometimes. This would only be for the normal channel, as the top boost doesn't need any more treble. - Replace reverb tank: I know that many have done this, but what's the difference? I find the stock reverb sounds ok, but I haven't compared it to anything else. - Change speaker: The famous and pricy Blue is a classic, but there are other nice alnico options by Celestion and other makers, as well as other ceramic options. I've found the old stock Greenback to work nicely, and also have a great clean tone, but again, I haven't tried anything else. - Different tubes: some have put in a lower gain tube for V1. I tried it once, but I don't remember a big difference. - Add a switch to jumper the channels internally. Do the same thing as you can do with a 4 input AC30 and a patch cable - New cab: find a plywood cab that can shave some weight off the obscenely heavy AC15 (that weight being the only real disadvantage) - Extra handles: two extra handles on either side (like an AC30) for the looks, and for carrying it two handed (that weight!).