[Milsurplus] R-388

gl4d21a at juno.com gl4d21a at juno.com
Tue Aug 9 09:33:44 EDT 2005


Larry:

AFIK, the break-in switch mod is one of the ways you can differentiate a R-388 from a 51J-3.  

I do not recall if I previously mentioned that that series of receivers follows the time honored tradition of the Signal Corps and is a high impedance input device.  The R-390 vintage stuff were the transition to lower impedance (75 and then 50 ohm) system impedance.  Somewhere (Electric Radio, perhaps) I read that adding a 75 to 300 ohm TV balun in front improves the sensitivity remarkably in a 50 ohm system.  Other than that, it is indeed a sensitive receiver.

hth,
George
W5VPQ


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