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PostPosted: Wed Sep 16, 2015 9:33 am 
Bottle Rocket

Joined: Wed Sep 16, 2015 8:36 am
Posts: 1
Hi guys,

New on here and seemed to have picked up an issue with my 50W Mesa Single Rectifier Solo head.

It is a 110V amp (running off an oversize step down transformer rated 5 times the amps wattage.) It has performed flawlessly for years. I run it into a Blackstar cab with 2x Celestions 70 80's.

Problem I'm facing is the suddenly the gain channel no longer has that beastly growl on modern but has turned into something soft like Shania Twains tone :( It started a couple of days ago.

I've done several basic troubleshooting like swapped out guitar cables, amp to cab cables, footswitch cables, used the channel switch to manually change channels.

The channels are switching but the distortion is absent. At most I've got an overdrive sound on the dirty channel.

I tried swapping out the 12AX7s in sequence one by one to see if that would assist with pinpointing a blown tube but no change in sound.

Out of Ideas....Appreciate some help.


PostPosted: Wed Sep 16, 2015 10:01 am 
Mark IV

Joined: Thu Aug 15, 2013 12:20 am
Posts: 656
Location: Tucson, AZ
Maybe, try getting contact cleaner and cleaning the jacks and tube sockets. Spray the cleaner on the tube pins or plug and insert it as many times as needed until it is clean. A bad connection from buildup of some sort could do that.

If you have any effects in the loop or between the guitar and amp, take them out to troubleshoot. Try another guitar, in case the guitar has a fault.

2007 3 Channel Dual Recto w/loop mod

My Humble Music Tech Blog:
Dual Rectifier Index

PostPosted: Wed Sep 16, 2015 1:00 pm 
Mark III
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Joined: Sun Mar 15, 2015 4:14 am
Posts: 163
Location: North Florida
I would buy a set of preamp tubes, more than one can fail simultanously, you should have a spare set anyway (power and pre). You may want to get some aresol Deoxit 5 and hit all the pots with that and work them stop to stop a bit.

PostPosted: Tue May 02, 2017 9:23 am 
Mark I
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Joined: Mon Mar 14, 2011 6:00 pm
Posts: 27
^^^^ agree. I bought a pre-amp tube set from Dougs Tubes for mine.........what a world of difference.

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