Where to get an amp repaired?

[jaash5]

I have a Marshall JTM 30 that has some issues. I need to get it serviced and possibly fixed and or modded to get what I want?

Any ideas on where or to whom I should take this to?

[TobaccoSoup]

What's the matter with it? It could be something simple. It's a pretty straightforward topology, not much to go wrong with it.

[jaash5]

I got the amp second hand for a really good price. It has a bias adjuster and a cooling fan added. When i got it it sounded awesome, but now the volume on the gain channel is lower in comparison to the clean channel, and the tone has become very fizzy on this same channel. Great tone clean, tone sucking and fizzy when in OD mode.

[Kyle B]

Always suspect the tubes first. Since your problem is on the dirt channel, not the clean channel, mostly likely it'd be the one labeled "V102" on the schematic
http://www.drtube.com/schematics/marsha ... -61-02.pdf
http://www.drtube.com/schematics/marsha ... -60-02.pdf
(I have no idea which one that is in the physical amplifier... maybe it's labeled??)

Since you have 3 ECC83's in there, you can just swap 'em around and see if it helps your situation at all. If things change dramatically, time for new tubes. If there's absolutely no discernible difference, then yes you need to take it to a tech.

You might give this cat a jingle: http://buffalo.craigslist.org/muc/4103799210.html I think he's pretty awesome. Of course, I'm biased 'cuz it's me

Tube amps are childs play compared to most of the stuff I work on. I'm finishing up a couple hot rod Fenders ATM - my bench will be open in about 2 weeks if you're interested.