This is a vage or general question but here goes..... My early 80's JCM 800 2204 50 watt model head has an added pretube circuit..... I have been told that this extra circuit is most likely the source of the extra noise and hum that the amp has... It's been checked over by a tech, but he is not the best tech... What type of MOD circuit is this.... what do they do besides add another tube for more gain?.... what else may go with this extra tube inside.....?
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? about my JCM 800's mod....
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Re: ? about my JCM 800's mod....
Sounds like it's just an additional gain stage, pretty common mod. But yeah, with more gain stages, you get more noise. Have the filter caps been changed?
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Re: ? about my JCM 800's mod....
Originally posted by Monty-JaySounds like it's just an additional gain stage, pretty common mod. But yeah, with more gain stages, you get more noise. Have the filter caps been changed?
MJ
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Re: ? about my JCM 800's mod....
Typically mods are a little noisier, but you have a very common mod. However, it shouldn't be so noisy that you can't use it. Where do you live, perhaps we can point you to a good tech in your area. Otherwise, there are a couple of techs we all know that do great work. You'de need to ship it to one of them, but they would make it right.
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Re: ? about my JCM 800's mod....
Originally posted by Jeff_HTypically mods are a little noisier, but you have a very common mod. However, it shouldn't be so noisy that you can't use it. Where do you live, perhaps we can point you to a good tech in your area. Otherwise, there are a couple of techs we all know that do great work. You'de need to ship it to one of them, but they would make it right.
As soon as i throw the standby switch it sounds like i have a single coil guitar and and fuzz pedal on... And that is with my volume off on my guitar.... or even when i do not have a guitar cable plugged in the amps imput... the noise/hum is always there.... my 5150 is dead quiet compaired to my 800 head... I knew it was a fixer upper when i bought it...
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Re: ? about my JCM 800's mod....
It just sounds like with a cap replacement and some other tweaks/shielding it can be made right. It will probably never be DEAD quiet, but it can get close.
If you have a tech with a reputation like you say, then it's worth every penny to take it to him. Give him carte blanche and say do what you need to do, make it right. It probably won't cost what you think to get it done, and you'll be much happier. The tone will kill you.
I had my 2205 modded to be Fender BF on the clean channel, and Plexi/2204 on the drive channel, just to get some of what you already have. Your 2204 will sound FANTASTIC when you get the noise issue taken care of....there is nothing like it cranked and smokin.
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Re: ? about my JCM 800's mod....
Originally posted by Jeff_HIt just sounds like with a cap replacement and some other tweaks/shielding it can be made right. It will probably never be DEAD quiet, but it can get close.
If you have a tech with a reputation like you say, then it's worth every penny to take it to him. Give him carte blanche and say do what you need to do, make it right. It probably won't cost what you think to get it done, and you'll be much happier. The tone will kill you.
I had my 2205 modded to be Fender BF on the clean channel, and Plexi/2204 on the drive channel, just to get some of what you already have. Your 2204 will sound FANTASTIC when you get the noise issue taken care of....there is nothing like it cranked and smokin.
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Re: ? about my JCM 800's mod....
It will definately be worth the drive. Theory and knowledge on how to get Marshalls to sound their best have come a long way. Amazing things can now be done to them WITHOUT adding tubes or diode clipping. I have no doubt that a good tech can achieve this for you.
Can't wait to hear how you like it.
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