After a number of long interruptions, I was finally able to get near the finish line, on my 300B Amp and Speakers The speakers are based on Markadio Alpair 7.3's The chassis I selected is quite a bit smaller, so wiring layout was a bit of a struggle. Amp is dead quiet! I have one issue, where channel balance is uneven, I've so far measured 98V between 1st and 2nd stage (pin 3 - 5) on one channel, 124V on the other. Will measure all other points and let you know.....

thanks Danny! I've got a pair of MarkAudio Alpairs that will go into some Pensil TL Cabinets, very efficient. As I get those assembled, I'll share photos here! /john