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Just received my new JCM 800 2203 head with a new vintage 1960 av cabinet. Hooked it up and turned the power on standby. Very noticeable humming sound coming from inside the head. Is this normal? I have a early 90's JCM 900 that never has made any sounds on standby or powered up fully. Can I get some advice before I decide to send it back and go with something else?

thanks much!

 

 

 

 

asked 14 Dec 2019 at 02:55 PM

Rory Lasee
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Hi there, guys 

I’m new to the forum and new to valve amps. In fact, I’ve just purchased my first valve amp: a brand new JCM 800 2203 reissue.

Running through a 1960av and a Rivera Rock Crusher attenuator and it sounds awesome - except for these damn so called ghost notes (just learned about them) that only happen when I set the master volume at higher values (above 6.5 or 7). It also only seems audible in higher pitches around the 12 fret.

Reading a lot about filter caps and stuff. But it’s a brand new amp and I still have warranty. So that’s not the case for trying to fix it myself.

My question is: should I assume it’s “normal” and keep my amp? If that’s the case, how can I crank it (and get that  beautiful power section overdrive) and minimize those annoying ghost notes? Is electric grounding improvement / adding a power filter of any good?

Or you guys think I should go to Marshall assistance and ask for a replacement?

Thank you very much,

Any help appreciated,

asked 15 Jul 2018 at 03:57 PM

Jopa Travassos
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