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Am I right in thinking that all pre500's were manufactured for US voltage? If this is true, when did the first ones start being made specifically by Mesa for Europe and 220V? I've had a look but I can't find an answer yet. :D

That is one stunning amp!

Thanks Dom. I'm going to replace the preamp tubes I think. (after a little more research on here) I that the likely suspect for the volume drop on one channel then? Cheers, Will

(Rev G Dual Rec) Hi there, After about thirty minutes of playing loudly I seem to get a big volume drop on the clean channel. If I switch it over to Variable High Gain on the back, it goes back to normal. The other channel is totally fine. I'm guessing this is a preamp valve issue? Thanks...

Thanks for the advice. Job done!

Hi there. Long time Dual Rec owner here, I finally got round to registering on the forum. Looking forward to some mods. Will

Thanks for this :)