by TomMcNally » Fri Jun 13, 2014 9:12 pm
Those are good sockets. 6B4G are 8 pin, Octal. 300B and 6A3 (and 2A3) are 4 pin, UX4.
The sockets you are getting from Triode need a 1 1/16" hole in the chassis, and two 4-40 mounting screws.
They look nice mounted from under the chassis.
Good luck with the amp, show us some pics!
... tom