Marshall

Kenny Hale, Huntington Beach with JCM2000 image

Exciting News for Marshall JCM2000 Owners

Exciting News for Marshall JCM2000 Owners We’re thrilled to announce the upcoming release of a replacement main board for the iconic Marshall JCM2000 amp series, including the DSL50, DSL100, TSL100, and TSL122. Sign up here to stay posted as they become available, and read on for more details about this rocking amp upgrade. Why You Need This Upgrade Great tone never dies, but unfortunately amp components do. As beloved as they are, Marshall’s iconic JCM2000 […]

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Marshall JCM2000 DSL100 Tube Damage

Note: We now have a new, superior solution to Marshall JCM2000 bias drift and valve failure issues. Find the details here.   Marshall JCM2000 DSL100 Tube Damage Cascading Events following an EL34 valve /tube failure This Marshall JCM2000 DSL100 tube damage  results in  a number of failures –  all caused by a Marshall branded EL34. The valve had short circuited. The EL34 was a TAD EL34 and these were supplied to TAD I believe from

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Marshall JPM50 Re-Commission

  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 is therefore highly desirable when fully operational.   The Marshall JTM50 on its last period of production, was re-branded as the Marshall JPM50. The amp went though final test at Marshall on 13th June. 1972. This is the highly desirable lead model from one of the

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Marshall JCM2000 DSL Image

Marshall JCM2000 DSL Hum Solution

Note: We now have a new, superior solution to Marshall JCM2000 hum, noise, and bias drift issues. Find the details here.   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 due to board leaking current.  This causes the EL34 output valves to overheat,We sell  Stable bias board kits for  the DSL and the

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Restoring a 1973 Marshall Super Lead

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 the time when good quality EL34’s were difficult to source. JCM900’s were using 5881’s in production. A master volume had been added too. The amp had been stored in a garage for 15- 20y ears so it was not a smart plan to switch it

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Marshall JCM900 Breaking Valves

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 original ones fitted to this 4102 model are shown below.  These are fitted over the 5881’s to hold them in place. The issue is that an amp is well gigged and in and out of vans suffers a lot of vibration. These holders rub on

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Marshall JCM900 Chassis image

Marshall JCM900 100 Watt Combo

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!! Low power output and VERY  loud mains hum Pots noisy Amp plays a dying gasp when amp switched off Pops / crackles and very low volume. The valves were tested on an AVO MkII and CT160 tester.  The preamp valves were down to a lot

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