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Marshall JCM 900 4100 blowing fuses
I’m not entirely sure how to determine the exact model but I can supply the following; It is a 100 watt hi-gain dual reverb Chassis end sticker says 4001 U Preamp board says 94 1-0 Speaker Jack board says A.I It should be noted the unit came to me with EL34s that tested approximately...- Hapa
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- Forum: Marshall Amps
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Marshall JCM 900 4100 blowing fuses
Sirs; I have on my bench a GCM 900 that is blowing fuses immediately on power up. I removed all the tubes and it still does it. The standby switch position makes no difference. I’m feeling this is a transformer issue, but there are no telltail Signs such as discolored windings or evidence of...- Hapa
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- Replies: 4
- Forum: Marshall Amps
