[R-390] Orange Drop vs ceramic disc

[Barry]

 On Fri 01/04/11  9:05 AM , rbethman rbethman at comcast.net sent:
> The difference in performance between the two R-390A/URRs that you did 
> have so many variables that it is impossible to say why.  Could be the 
> difference in alignment, methodology of restoration, or different 
> manufacturer of the actual radio.
> 
> You have been using HP equipment lately.  What did you use before that?

At that time, I was using an HP410B, a General Radio GR1001A with a Fluke 1920 counter .  The 1001A was replaced with an HP606A and now an HP8640B.  I still have an HP410B and an HP410C.

Barry - N4BUQ