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ceez
Senior Member
Posted
Have a friend, Allen, who has a Marshall JCM 900 early '90s combo that has a problem that just came up. As we were trying to play it today, plugged in amp, connected guitar, NO SOUND! Not even a hum!

To troubleshoot, we left it on to let the tubes and transformers warm up. After a while of waiting, all tubes were warm to touch, but the transformer behind the guitar cable input was cold as though to suggest it wasn't working.

If anybody here might know what is going on, or if anybody has some suggestions it would be greatfully appreciated. Allen is sad. Frown
 
Posts: 169 | Location: Bakersfield, CA | Registered: October 11, 2005Edit or Delete MessageReport This Post
rologibson
Grand Master
Picture of rologibson
Posted Hide Post
Tube amps required technical mantainance, I had trouble with a Marshall Tsl amp. I learned that a knowledgable repairman has to bias the tubes (regulate voltage of the amp so that all the tubes receive same voltage) plus there are other internar parts that do wear out after a while so dont try to repair yourself. A music store that sells Marshall Amps should have the repair manuals, good luck.

This message has been edited. Last edited by: rologibson,


"At higher gains, it gets a bit pregnant sounding in the lows"-Corleone
 
Posts: 670 | Location: Marshall Territory | Registered: June 09, 2007Edit or Delete MessageReport This Post
Billion81
Member
Posted Hide Post
Sounds like a small issue but if you are not a tech type than take it to an amp tech. Being in Bakersfield you should go to the man himself at PlexiPalace. He is the guru of all gurus on those bad daddys. Now clearly the plexi palace guys are really about "Plexi" style Marshalls but likely know there business on the JCMs.

Also check out Jerry Blaha @ AmpCrazy in Hollywood. He does shit loads of Marshall repairs.

ted

quote:
Originally posted by ceez:
Have a friend, Allen, who has a Marshall JCM 900 early '90s combo that has a problem that just came up. As we were trying to play it today, plugged in amp, connected guitar, NO SOUND! Not even a hum!

To troubleshoot, we left it on to let the tubes and transformers warm up. After a while of waiting, all tubes were warm to touch, but the transformer behind the guitar cable input was cold as though to suggest it wasn't working.

If anybody here might know what is going on, or if anybody has some suggestions it would be greatfully appreciated. Allen is sad. Frown


1994 Fender VibroKing
Marshall 2061HW
1966 Marshall JTM 45/100 Full Stack
2 EJ Fender Strats
Fender custom shop Danny Gatton Tele w/Bardens
 
Posts: 28 | Registered: May 28, 2007Edit or Delete MessageReport This Post
ceez
Senior Member
Posted Hide Post
quote:
Sounds like a small issue but if you are not a tech type than take it to an amp tech. Being in Bakersfield you should go to the man himself at PlexiPalace. He is the guru of all gurus on those bad daddys. Now clearly the plexi palace guys are really about "Plexi" style Marshalls but likely know there business on the JCMs.


Thanks Bill. You're probably right. Allen and I aren't real amp tech guys. We just play them. He'll have to check PlexiPlace.

This is really disappointing to me too, as I'm in the market for a Marshall sounding/style combo amp. I've been researching on Marshall combos and there tends to be mixed reviews on these amps. Technical problems! I know that they sometimes run hot, but other problems? Kind of a turn off for a possible consumer, huh. Confused
 
Posts: 169 | Location: Bakersfield, CA | Registered: October 11, 2005Edit or Delete MessageReport This Post
hellwood
Junior Member
Posted Hide Post
quote:
Originally posted by ceez:
quote:
Sounds like a small issue but if you are not a tech type than take it to an amp tech. Being in Bakersfield you should go to the man himself at PlexiPalace. He is the guru of all gurus on those bad daddys. Now clearly the plexi palace guys are really about "Plexi" style Marshalls but likely know there business on the JCMs.


Thanks Bill. You're probably right. Allen and I aren't real amp tech guys. We just play them. He'll have to check PlexiPlace.

This is really disappointing to me too, as I'm in the market for a Marshall sounding/style combo amp. I've been researching on Marshall combos and there tends to be mixed reviews on these amps. Technical problems! I know that they sometimes run hot, but other problems? Kind of a turn off for a possible consumer, huh. Confused


listen pal! you need at least 1 Marshall! take your chances. you wont be sorry!
 
Posts: 8 | Location: malibu | Registered: March 02, 2007Edit or Delete MessageReport This Post
bandofthieves™
Senior Member
Posted Hide Post
quote:
Originally posted by ceez:
Have a friend, Allen, who has a Marshall JCM 900 early '90s combo that has a problem that just came up. As we were trying to play it today, plugged in amp, connected guitar, NO SOUND! Not even a hum!

To troubleshoot, we left it on to let the tubes and transformers warm up. After a while of waiting, all tubes were warm to touch, but the transformer behind the guitar cable input was cold as though to suggest it wasn't working.

If anybody here might know what is going on, or if anybody has some suggestions it would be greatfully appreciated. Allen is sad. Frown

Have you checked the HT fuse??? If it is blown don't replace it with anything other than the same value..Good Luck
 
Posts: 126 | Registered: April 05, 2007Edit or Delete MessageReport This Post
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