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Old 11th Aug 2018, 11:50 am   #9
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Join Date: Mar 2006
Location: N.W. Oxfordshire(Chipping Norton)
Posts: 6,595
Default Re: Marshall JTM45 Guitar Amplifier- Mains (Primary)Fuse Blows

I'd already downloaded & printed the schematic diagram from that site, Colin. It looks fairly straightforward, but one thing puzzles me a little, which is what is the function of the semiconductor diode connected between one side of the HT secondary and the o/p valve grid bias resistors, via some r's & c's?
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