[Milsurplus] R-388

[telegrapher at att.net]

got the newly acquired R-388 fired up.  Now a question.

In the 388 manual they show 2 jacks on the front panel.  One for 
headfones and one for speaker.  My unit does not have this.  It has one 
jack for headfones and where the 2nd jack was it has a toggle switch 
labeled "break-in" ON- Off".  On the front panel is labeled "MWO SIG 
11-264A-1"  Did that MWO change out the jack for the switch?  Or, is 
this not really an R-388?  What's the difference between an R-388 and a 
51J-3?  Or are they the same radio just different nomenclature depending 
on who wanted to use them?

The mod is not ham done, it looks like it might have been done in Depot 
or somewhere along the radio line as the lettering matches up with the 
rest of the lettering on the panel.

ALso, has anyone put a signal generator to the antenna input and 
measured the sensitivity of theirs?  With 400 cycle modulation i can 
hear a signal at less than 1 uv.  I takes about 90uv to read 40Db on the 
"S" meter and about 12uv to read 20db.  Is it fair to think that this is 
a pretty good sensitive receiver?  Methinks it is.

However the BFO arrangement is not working.  Seems to be a thing with 
all the receivers i end up with.

Larry
W0OGH