The link posted goes to pics of me in two files, and an empty file. Nothing to do with a 300B amp. I contemplated one until PB built my MQ-enabled stereo 2A3 amp attached here. The tubes are JJ 2A3-40's and the OT's are MQ TFA 2004 M6/Cobalt pinstriped. All MQ chokes, etc. & all V-Caps You can see the Cobalt lams in the middle of the stack.
Cheers, Hank