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My Marshall…

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Started by Auto_Surgery (Andy) in Musicians (Gear, Tabs & Lyrics)

I have a Marshall JCM900 4100 Dual Reverb head. I’ve noticed that it’s not as loud as it once was, thus I’m planning to get it re-valved and serviced.

I’ve got some cheapy cheapy valves in it at present, anyone got any suggestions as to what are the best mid range valves?

It’s power amp section is driven by 4 EL34’s and the pre amp by 3 x ECC83’s

Not really the place for this question but figured people who share my taste in music must have some experience in getting their amps sorted

Posted on Tue, 5 December 2006 at 21:18

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#1

ctrlaltdelete (chris) wrote:

Buy this months guitar and bass magazine, they have a feature on some nice valves.Why have you got cheap ones in?that might be your answer right there.

Posted on Tue, 5 December 2006 at 21:58

#2

Auto_Surgery (Andy) wrote:

Some JCM’s were equpped with 5881’s when there was a shortage of EL84 during the 90’s. My Friend bought new valves for his (thinking they were El84’s) but his had 5881’s in it - You can tell if a JCM 900 has 5881’s by the fact the Speaker Output Jack Sockets have a red gromit around them…

Anyways I bought them from him for about £20 which is what he paid so I figure they must have been cheap!

Thanks for that, I’ll pop out at lunch time and get a copy of that mag :D

Posted on Wed, 6 December 2006 at 12:20

#3

Lector wrote:

http://www.jj-electronic.sk/
JJ´s are the best valves for Marshall me thinks. But be sure you´ll get a matched set. Otherwise the tubes won´t last too long.
Also check out http://www.tubeampdoctor.com/
Great stuff there. The Biasmaster especially. You can replace the tubes and then easily bias the amp yourself. Gets cheaper in the long run.

Posted on Fri, 8 December 2006 at 09:30

#4

Auto_Surgery (Andy) wrote:

Wow awsome site Lector, cheers for the advice :D

Posted on Fri, 8 December 2006 at 09:49

#5

buffalo-boy wrote:

Or a better idea would be to sell it..and your guitar and buy a bass and amp instead… then you could be a REAL musician he he he!! :p

Posted on Fri, 8 December 2006 at 16:28

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