[Chuck Schwark]

Thanks Ron, I looked thru all my Philco Parts Calatogues too - same thing.
Finally, figured out that it is 1.5/90 from various battery set's schematics and voltages and tube data.

Thanks Bill. My client for the Model 41-90 also got a info sheet about your battery repro service with your email in my info packet.
You should get a small website with more pics and specs & details.

Chuck