[Daniel Bingamon]

I'm working on a 37-610 and it has a 5Y4G rectifier and the schematic shows that as well.
Its compliment is 5Y3G, 6A8G, 6K7G, 6Q7G and 6F6G.
But other general 610 drawings have the older tube set starting with the 80 rectifier.
I suggest comparing the whole set of tubes as manufacturers don't wait till end of year to put changes into place. Looking at the set as a whole might help match drawings closer.

But try to put the tube that was intended for the set in place - this can take a little detective work.