[Milsurplus] was [MRCA] SCR-288 - MI-8751 - BC-474

[Hubert Miller]

Al,
Your Japanese key is JNAF. I have this key also, and some photos of the key with the radio ( which I cannot access right now. )

The R3RB-61 receiver: I would guess similarly, "3 receiving tubes, regenerative, battery supplied". The number I have no guess.
( I have a National Parks service radio DC2A3. In a similar way of interpreting this model number, I read this one as, "2 volt DC
operated, voice only radio. )

The YN "date code" I would say is right on: 1934 is perfect. The CMS tube selection looks more 1940-41 and at this point no one,
including Meissner kits, would be using the #30 tube in a new design. My thinking on the CMS is still that it was intended as a
Philippine stay-behind set, or maybe for the U.S.N. Saco operation in China, but was judged too 'hammy' in operation rather
than suited for military operators of varied experience.  Also, I maintain that a QST article in 1940 ( can't cite date right now )
was instrumental in the CMS design, in that the QST 'survival radio' used a similar transmitter tube socket wiring so you could
use any of about 10 different tubes from 1.5 to 6 volt, triode or pentode tube.
-Hue
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