Marshall

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

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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

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