[Radioroslyn]

Hi Dave
B- on your set would be at the off/on switch.
Connect the - lead to it and the + to the pin
that is to be measured. With modern meters
the measured voltage will read a bit higher
than what is listed. They don't load the
circuit down as much as the older ones.

As my neighbor Jon said be really carefully
working on these old guys this isn't 1938
anymore and the the 604/37-604 are kinda
rare/collectable because of there unusual
styling so finding a parts set may be difficult
and expensive. Last one I saw in good shape
was about $200.

I've got a 37-604 that I picked up on Epay
a while back. Great playing set with good
sensitivity on both BC and SW bands. The
only problem I have with it is I don't have
enough time to listen to it as much as I'd like!
Love the dial pointer.
GL w/it
Terry