On the bench: Sylvania Halolight 21C611M

[DaveWM]

Low B+ does it match what the sams say it should be?

Did I see that you have the orig selenium rectifers still in? if so may be the cause of low B+ (if test low).

I assume the centering rings have been tried, I ask cause generally speaking you would have equal amounts of space on either side to confirm the pic is actually narrow.