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It could be one of the pre amp tubes, specifically the v1 tube. I would recommend getting a mesa spax7 tube for it or a normal tung sol in v1 to eliminate the noise. * thanks. I have been fiddling around with the settings, and turned the loop switch off so now all three channels volumes are...

hi scratching my head what to do. I have had a mark V for about a year or so sounds pretty great racked up. However were trying to record now, and are finding a buzz behind most of the tones especially audible on clean and at certain lower frequencies. Ive taken it apart, tightened all screws...

I do believe it is slightly more complicated than that. Varistors, fuses small components etc have to be added and changed. Dangerous advice to say it's a straight swap and match.

thanks. Dunno why its so hard to find the export schematic, this amp has been out for years..!

Yup already been there ty. It's not a mark V unfortunately but it's certainly the closest I've found. He's also a helpful guy. Apart from this the Internet appears to not hold an export/uk conversion schematic/guide

possibly this has been covered before. Does anyone have a copy of the export schematic for Mark V power transformer. I have a US model which obviously needs to be converted which is quite possible but without the schematic is considerably less possible.! Has anyone successfully done this? and...