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Old 11th Aug 2018, 10:49 am   #5
'LIVEWIRE?''s Avatar
Join Date: Mar 2006
Location: N.W. Oxfordshire(Chipping Norton)
Posts: 6,579
Default Re: Marshall JTM45 Guitar Amplifier- Mains (Primary)Fuse Blows

Thanks, everyone for your suggestions. B.t.w., the amp is a 1990 production version with the small components mounted on a fibreglass PCB. The rectifier is a GZ34, and the o/p valves are 'GT' KT66 x 2, although a maker's plate on the amp. chassis states that they should be 5881's, which should 'only be replaced with the same types' I won't be back in the workshop until Monday, but will follow the advice given. Martin, the message I got was something to do with the biassing, so maybe the o/p valves are at fault. Now to look for some 1.25" 2A (T) fuses!
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