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Discussion Starter · #1 ·
Hey my JCM 800 sounds a bit noisy in the effects loop, like a hissing sound when i put my delay in, and the delay is fine, not noisy at all on my JCM 900. The JCM 800 doesnt have an effects loop level control for some reason. Are the 800s usually noisy in the loop or is this just mine?
 

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Ant1981 said:
no its not modified, its the split channel, and they did have loops, dunno where you got that idea from, check your resources
Oh! its a split channel, I see.

The old 2203's(100w) and 2204's (50w) DIDN'T have FX Loops.

The split channel amps did have FX loops.(The 100w version was the 2210, the 50w version was the 2205)
 

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Gex said:
The old ones never had loops. (IIRC) only the reissues.

Its been modified.

I'd have a tech look at it, make sure it was done correctly.
Didn't the later models, the 2205 and 2210 have an effects loop? I think they did but I am not sure - I keep forgetting.

Edit: I've been beaten!

But yeah I would take that to a tech. Could have a bad capacitor or something that is not getting power and making noise.
 

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honky_tonk said:
probably a bad preamp tube.??... i think the effects loop is probably in the tube path
This is also what I was thinking.

Id rotate the tubes around, or replace them if youve got some extras. (or "Borrow" the ones from your JCM 900 real quick, just to see if thats the problem)
 

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Discussion Starter · #12 ·
Maybe I should get it re vavled, wish I knew how to bias it myself, I could do it, being an electrician i've got the sense to do it, just need to know what to do to the amp.
 

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Gex said:
This is also what I was thinking.

Id rotate the tubes around, or replace them if youve got some extras. (or "Borrow" the ones from your JCM 900 real quick, just to see if thats the problem)
The effects loop on Marshalls has always been solid state.
 
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