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Not normal. Possibly a microphonic tube.

My 5:25 has no more hiss than any other tube amp I have ever owned or used in 30 years. It seems entirely normal and appropriate to me.

I the guitar world nobody that I know of stocks replacement parts for reverb tanks because it's just not cost effective when replacement tanks are cheap and easy to install. Your best bet is the major electronic components suppliers, e.g. RS, Farnell, Mouser, Newark etc.

What they said.

Because of the diagonals in the weave that looks more like a tweed used to cover amplifiers more than it looks like jute. Most grill cloth materials have no diagonals to them at all. The closest actual grill cloth with similar diagonals I can find is this Fender style brown, but that definitely...

I found this thread while researching because my Express 5:25 does a similar same thing. With the reverb knob set to 9 o'clock it's an unusable, huge mid scoop, like there's a phase issue. The reverb then sounds fine from 10:30 - 12 o'clock, but turning it up higher doesn't add more reverb, just...

I would not simply replace the fuse and continue troubleshooting yourself. Fuses should never blow on their own accord. Always assume a blown fuse is indicative of fault and something somewhere needs to be diagnosed and replaced. An experienced amp tech can do that without risking further damage...

Dominic Miller has been playing with Sting since the 90s. His main choice for most of that was a pair of Lone Stars, though he used a pair of Express 5:25s for a tour back in 2012 (part of the reason I bought one).

Steve Lukather was a Boogie dude in the 80s. Mark II C+ I think. This Star Licks video was recorded in 1984.

Vernon Reid of Living Colour has been a Boogie dude for 30+ years. Mostly rectifiers and a Lone Star on occasion.

Send me private message here with your email address and I'll email the schematic I have to you. I'd start by verifying the voltages. That will help you figure out what part of teh circuit to look at,.

Email Mesa and give them your serial number. They can send you the appropriate schematic and maybe give you advice on what to check. The power section itself isn't too complicated but finding/accessing the components may be some work.

My first guess would be a loose component somewhere that rapidly connects and disconnects when you hit the big low note. If that's due to a cracked solder joint it could be impossible to find but there's more obvious things to go after first. First do a tap test tap on each tube. If you get...

Oddly, it's the amp I never had that brought me to Mesa! In my earliest years (early 90s) I had a Crate combo, then a Fender Performer 1000 (holy loud, Batman!), then in my 15 years of gigging I used smaller Laney combos (EL84s, British voiced, 10" Celestion speakers). Coming to the end of the...

The two JFETS, J175C1 and J175C2 are the possible culprits here. When they are faulty, the contour circuit won't work right. They are also easy to change without totally dismantling the amp. Easy and fast job for a tech. I just changed mine and now I hear what the contour is supposed to do!

I have no expertise but I do know that tubes that are sold as matched may not be, and expecting up to a 10% difference seems reasonable. And once they go into an amplifier and start working, they can drift further out of whack too. Honestly, I have tried some A-B recordings of pairs of tubes...

The Express 5:25 combo came in both 1x12 and 1x10 versions. The 1x12 had the V30. (I changed mine out for a V-type and finally settled on a Greenback for less bass and more treble).

Fantastic idea!

Well done and thank you, Wagdog! I may do this myself in the coming months.

The Express series and Stiletto series are completely different pre amp designs and voicings and there is no Marshall-style bright cap as such. The only caps connected directly to the gain controls are C4 (0.001 µF) for Ch2 and C16 (0.005 µF) for Ch1, directly from V2a, which (I think) is the...