I bought a Carvin Clubmaster that had a fresh set of these a few years back and one shorted right after I got it. This set has been in my spare tube box for a few years. I dropped a 2 of the 3 I have into my Marshall JCM 900 MK III Dual Master 50 last night and they KILL in this amp! What are these ? I have never seen this base and plate design before. I know Mesa doesn't build tubes so they are relabeled something else so--what are they??
![](http://img.photobucket.com/albums/v27/rutledri/My%20stuff/DSCF0445.jpg)
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