Where to get an amp repaired?

Talk about everything related to guitar and bass.

Moderators: guitarmartin416, Admin Team

jaash5
Member
Posts: 22
Joined: February 5th, 2013, 10:23am

Where to get an amp repaired?

Postby jaash5 » November 13th, 2013, 4:48pm

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
Member
Posts: 35
Joined: August 7th, 2004, 10:20pm
Location: within an electro-magnetic field
Contact:

Re: Where to get an amp repaired?

Postby TobaccoSoup » November 13th, 2013, 6:01pm

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
Member
Posts: 22
Joined: February 5th, 2013, 10:23am

Re: Where to get an amp repaired?

Postby jaash5 » November 15th, 2013, 1:18pm

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.

User avatar
Kyle B
Member
Posts: 224
Joined: November 20th, 2007, 6:24pm

Re: Where to get an amp repaired?

Postby Kyle B » November 21st, 2013, 1:50am

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.


Return to “Guitar and Bass Forum”

Who is online

Users browsing this forum: No registered users and 1 guest

(function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })();