Problems with RM50

[wengnutt]

Hey everyone.

I've had this RM50 for around a month now, and I've been having some problems with it.

First, when it arrived I was getting an AWFUL buzzing, cutting in and out farty sound out of it. Then the whole thing powered down, and it turned out to be the main fuse. I replaced it and it seemed to work fine! Then I rebiased it and the farty sound was gone...or so I thought. Now it's having problems with the volume jumping up and down and the channels arent switching from both the footswitch, and then front of the amp. I'm at a loss for words now.

Anybody have any clues what the problem could be?

Thanks in advance for the help.

 

[wengnutt]

Bump

 

[JKD]

Hate to say it but if you've not managed to solve the problem with tubes then it likely took a bump in transit.

It really sounds like you have some kind of loose connection somewhere.

Volume jumps can sometimes be associated with the fx loop contacts....plug a regular patch cable from the series send directly to the return and test again....

...however, given that you are having foot switch problems too and I think all those jack plugs are on a single board...possible something took a knock back there.

 

[wengnutt]

Hate to say it but if you've not managed to solve the problem with tubes then it likely took a bump in transit.

It really sounds like you have some kind of loose connection somewhere.

Volume jumps can sometimes be associated with the fx loop contacts....plug a regular patch cable from the series send directly to the return and test again....

...however, given that you are having foot switch problems too and I think all those jack plugs are on a single board...possible something took a knock back there.

Good point JKD. I havent checked that part of the board yet. I'll take a look and see what I can find.

Thanks man!

 

[GtrGeorge!]

i also have a RM50 combo which has troubles. There is very little output and what little there is is spitty and sputtering. I have chnaged modules, cleaned contacts..and it will persist for some time and then...its working fine. i dont get it.
I did notive the power tubes were running just mildly warm when the sound sucked and properly heated when the amp sounded fine.
Can anybody confirm if this is a transformer issue?? In other words,..when transformers fail...do they supply insufficient power to the power tubes intermittantly...???
GtrGeorge