[Milsurplus] Question: What rigs used the 837 tube?

[Mike Morrow]

Ian wrote:

> GF (some models)

More specifically, the complete list:

CBY-52028   GF-2           (1934)
CBY-52063   GF-3           (1935)
CBY-52063A  GF-4 to GF-10  (1936 to 1939)
CW -52063A  GF-11, GF-12   (1941)

Mike / KK5F