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PostPosted: Mon May 07, 2018 3:52 am 
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Mark I

Joined: Wed Mar 27, 2013 7:28 am
Posts: 23
Hello,
My Lonestar Special keeps burning the tube rectifier and fuse. Every other week or so. I understand that Mesa offers a mod to avoid this situation but I am not in the position to send the amp to Mesa for modification since I am in Romania. I tried various tubes, I ordered from TAD and they know about the LS problem with the rectifier tube. I installed the new set but the rectifier burned within a week. Replaced the rectifier but I noticed that the EL84 tube farthest from the 5Y3 was redplating. Is there something wrong with my amp? Any ideas?


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PostPosted: Mon May 07, 2018 7:28 am 
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Single Recto
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Joined: Sat Jan 12, 2008 12:32 pm
Posts: 1319
Swap the EL84 that's red plating to the EL84 socket farthest from it. Generally, if the redplate issue follows the tube, it's a tube issue, if it stays with the socket, it's an amp issue.

I don't know the details of the mod, but you could try an NOS 5Y3 or 5V4. They are much more robust than new rectifiers.


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