I won't fit anything other than new-production tubes to Matchless amps. They don't last long at all and I got bitten years ago by fitting expensive NOS and having them come back after three months.
The killer with these amps is studios leaving them switched on all day long unplayed and not putting them in standby between sessions, or even takes.
Another problem is those tube socket sleeves with the Nomex (or whatever) lining. They cause the base to overheat. I had an amp with an arced socket and when I replaced them got rid of the sleeve and installed a regular bear-trap retainer. I noticed on the last tube swap the bases hadn't discoloured anywhere near as much.
The killer with these amps is studios leaving them switched on all day long unplayed and not putting them in standby between sessions, or even takes.
Another problem is those tube socket sleeves with the Nomex (or whatever) lining. They cause the base to overheat. I had an amp with an arced socket and when I replaced them got rid of the sleeve and installed a regular bear-trap retainer. I noticed on the last tube swap the bases hadn't discoloured anywhere near as much.
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