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Old 09-21-2014, 10:00 AM   #1
juliusxxrock
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JCM 800, time for new tubes?

Heya!

I just brought my jcm 800 home from my bands rehearsing place since we nowadays rehearse at our school.

Anyway, when I turned it on it sounded pretty crappy.
Sure, the volume was low, but this amp sounded like shit to my ears. I even played it through my other cab.
I don't know if it's because I want a more distorted sound than before, but this sounded harsh, very un even, like the tone didn't ring out in a smooth way, it kind of sounded like a tremolo effect was applied. I also feel like it's lost some gain, but I'm not sure about that. I'm boosting my signal with a bad monkey, but I'm using it as a clean boost.

The amp have been standing in a garage where the climate, so I can imagine the tubes have taken a beating from that.

I can fix a video where I play the amp through 2 different cabs for you guys to hear.

Any ideas?
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Old 09-21-2014, 10:02 AM   #2
Cathbard
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First thing to try is to remove all the tubes and plug them back in again.
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Old 09-21-2014, 01:20 PM   #3
Fisheth24
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Quote:
Originally Posted by juliusxxrock
Heya!

I just brought my jcm 800 home from my bands rehearsing place since we nowadays rehearse at our school.

Anyway, when I turned it on it sounded pretty crappy.
Sure, the volume was low, but this amp sounded like shit to my ears. I even played it through my other cab.
I don't know if it's because I want a more distorted sound than before, but this sounded harsh, very un even, like the tone didn't ring out in a smooth way, it kind of sounded like a tremolo effect was applied. I also feel like it's lost some gain, but I'm not sure about that. I'm boosting my signal with a bad monkey, but I'm using it as a clean boost.

The amp have been standing in a garage where the climate, so I can imagine the tubes have taken a beating from that.

I can fix a video where I play the amp through 2 different cabs for you guys to hear.

Any ideas?


Aren't you the guy that uses a Valveking for cleans? Maybe I'm wrong, Also. Listen to Cathbard, but I'd try putting the tubes in and out again, but also changing up the preamp tubes for now.
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Old 09-21-2014, 02:09 PM   #4
MaaZeus
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Quote:
Originally Posted by Cathbard
First thing to try is to remove all the tubes and plug them back in again.



...with a healthy dose of not-lubricating contact cleaner on the pins I might add.
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Old 09-21-2014, 09:44 PM   #5
Cathbard
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Agreed. I'd hit it with electrical contact cleaner as well. But if you don't have any just pulling and replacing them will often do the trick even without it. When you pull them out it's usually pretty obvious if it needs cleaning. Don't use WD40 or anything like that, you want proper contact cleaner. Deoxit is a good one.
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