Lonestar Special rectifier tube mod

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adrianni

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Mar 27, 2013
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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?
 
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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