[Jake Blake]

" . . . look see if any are from the time frame of 1939-1940."


Of the 3 metal, 12-volt tubes, the Raytheon 12SA7 appears to have what might be a date code - the numbers 280 and 617 stamped on the body.  If it is, I'm not sure how to read it.

The Ken-Rad 12SQ7 has the number 62 stamped on the base.  Would that be for 1962?  But we know this radio is older than that.

The Tung-Sol 35Z5GT  has the number 12 stamped on it's base.

. . . and the GE 50L6GT  has 3-09  and 188-5 stamped on it's base.  Could that be the ninth week of 1943?  

Thanks David.