Don't own any CJ gear, wouldn't mind trying one of there preamps on my Mac tubes though. I'm just surprised if it wasn't just one batch of bad tubes that a company like CJ didn't offer a fix. Running the heaters at that elevated voltage will cause problems with tubes. I'd want to see the heater voltage between 6.1 and 6.2 volt's for long life.
Not bashing CJ gear, like I said, I'd love to try one of the preamps, even an older one, I have heard nothing but good reports on them.
BillWojo
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