>From what I understand, the GC at the end of the 6L6 means "glass
container"

WRONG!!! This is an error coming from Aspen Pitman from Groove Tubes.
The "G" means glass envelope. The "C" means this particular model
(supposedly) conforms to the specifications for the C revision to the
design, as opposed to the B revision, A revision, or original design.
Don't believe everything you read in Pitman's books.

Regards.

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