[BC] What are these?

[Milspec390 at aol.com]

51J-4? In which photo? Not the one posted. This is a 51S-1. 'J-4, 
sometimes referred to as R-388A, almost identical in appearance to 
R-388/51J-3. 'J-4 distinguished by addition of lever peripheral to 
BFO PITCH knob, to select 1, 3, or 6 Kcs filters.


Is there another photo depicting 51J-4? Curious.

I'll have to take a look in radio room & below workroom. Maybe I 
collected 51S-1's over the years, rather than R-388's? Doesn't that 
make me a canny investor? Yow!

                                                              z

pv zecchino
manadisparities key, fl