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What do you think has happened to my amp?
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16th March 2013
Old 16th March 2013
Gear interested
Joined: Mar 2013
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Thread Starter
Thematt202 is offline
What do you think has happened to my amp?

My Marshall JCM800 2203 amp head was switched on at the mains with both the standby and power switches set to the "on" position (by a non-guitar playing friend). There was a big blue flash from the head and now the amp is dead.

Can anyone give a rough idea as to what has potentially blown and whether this is repairable (by a professional, not into DIY fixes personally).

Thanks in advance!
16th March 2013
Old 16th March 2013
Gear addict
Joined: May 2006
Posts: 367

trippy is offline
A fuse blowing can make a flash like that, but its more likely you'd notice it in a dark or semi-dark room. Have you checked the fuse/s?

If the amp had the correct fuse/s installed, there no reason that anything else would have been damaged. In fact, normally that situation (fully "off" to fully "on") wouldn't have even caused a fuse to blow.
17th March 2013
Old 17th March 2013
Gear nut
Joined: Aug 2006
Posts: 141

markblasco is offline
You may have blown a power tube, which would probably then blow the fuse. If that's all that happened, than you'll need a new set of tubes and a new fuse, which is easy for a tech to do. If it's more than that, a good tech should be able to figure it out and fix it.

There is very little that can't be fixed on an amp by a good tech. This is something you don't want to just take to whatever music shop is local, find a certified marshall repair tech and go there. If they don't have a listing on the Marshall web site than email them and ask where you should take it.
17th March 2013
Old 17th March 2013
Lives for gear
Joined: Apr 2007
Posts: 3,099

Joe Porto is offline
As mentioned, you probably blew a tube, but take note...the amp should be able to handle being switched on to full power. It may take some life out of the tubes, but not blow them. The tube was probably weak already, or had a defect which caused it to short when powered on cold.
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