Search found 18 matches

by Rroxon
28 May 2017, 15:36
Forum: Marshall JMD1
Topic: jmd 1 head fuse keeps blowing
Replies: 29
Views: 7923

jmd 1 head fuse keeps blowing

Not sure how to deal with this now... I've changed out the EL34's from JJ... The JJ preamp tube did not work.. So I reinstalled the original ... The F1 1 amp fuse still keeps blowing.. Bias on both sides are set at 78mv.. Any thoughts on this issue ??? I'm stumped.. :bang
by Rroxon
25 May 2017, 20:04
Forum: Valve Amplifiers
Topic: JJ EL34 matched set of 4
Replies: 1
Views: 549

JJ EL34 matched set of 4

I just purchased a new set of EL's for my JMD 1.... Only one of the tubes has a 21 test point while the other three have 20... WTH.. I still haven't heard from the seller.. Any Ideas ????? Thanks
by Rroxon
25 May 2017, 19:31
Forum: Marshall JMD1
Topic: BIAS
Replies: 15
Views: 11200

Re: BIAS

i just bought a set of new JJ tubes for my JMD 1... Only thing I don't understand is one of the set of EL34's have a 21 bias set point... The other three are 20's... Still haven't been able to get an answer... I have the tools to bias my amp..But am scared as hell I'll blow something up................

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