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Possibly a fuse. See these photos....

Posted by AbeCollins on July 16, 2022 at 18:06:03:
I found a couple CJ Premier 11a photos on the internet.
There appears to be two fuse sockets on top of the chassis and four fuses in fuse clips under the chassis. The ones up top should be easy to check as I believe the RED LED should light indicating a blown fuse.
You'll have to open the CJ to see the fuses under the chassis.
Check the values and replace with identical fuses or CJ might send a complete set free of charge - ask them.

There wasn't a big difference between the Premier 11 and Premier 11a. According to the schematic it appears that the power tube filaments go directly to the transformer output but the signal tubes are AFTER the fuse and bridge rectifier [for DC on the signal tube filaments]. I suspect the fuse but w/o being there to actually measure with a DMM this is just my best educated guess.
Good luck !!