A Marshall JPM 50 arrives in the workshop.  This blog covers this  Marshall JPM50 Re-Commission. This Marshall  JPM50 Amp is from the classic era of pre-1973 Marshall amps. It…

Marshall JCM2000 DSL Image

Marshall JCM2000 DSL100 Hum after warmup fix   There are a couple of key problems with the Marshall DSL can TSL series printed circuit boards.  One is the drifting bias…

Our task was to renovate a June 1973 Marshall Model 1959 Super Lead 100 watt head It had been modified in the 1990’s to use 5881 output valves. This was…

A Marshall JCM900 Breaking Valves was the cause of this amp’s failure. It travels around a lot and it has the original 1990’s valve retainers on the output valves. The…

Marshall JCM900 Chassis image

A Marshall JCM900 100 Watt Combo  arrived in the workshop.  This version is the 4102  It was very poorly. The first issues seen were : 10 amp fuse in the plug!!…

Marshall JCM2000 DSL amp image

The early (1997-2003) Marshall JCM2000 DSL50, DSL100, TSL100 and TSL122 amps are often troubled by an unstable bias (drifting bias). These are nice amps and I have one myself This…

Here are Things learned about Valve Amps in 2018 . They are in no particular order. Perhaps some useful info about your amp. I thought I would share them before…

EL34L JJ Matched Quad Pack Image

We have broadened our range of EL34’s in our store. But which one is best for my amp? This is a handy quick guide to EL34’s We now have :-…

A Marshall JCM900 amp arrived.  The JCM900 combo is basically a 100 watt twin 12 inch speaker combo and is a true Marshall stack in a matchbox. Nice and easy…

Customer Reviews


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"New customer here. I want to say that I was blown away with the incredibly fast shipping! Now I can get my JCM 2000 DSL 100 performing the way it should with no bias worries much sooner that I thought. The fantastic price, wonderful illustrated mod instructions and unbelievable shipping speed is second to none. The whole experience was great and I would highly recommend valvetubeguitaramps.com for all of your amp needs!" - North American customer J.J. bought a Marshall Stable Bias kit reviewed 4th January 2021

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"Fast reliable service and good value!" UK customer bought Vox AC 30 CC2 valve kit and reviewed 14th January 2021

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