[R-390] meters arrived

[ka9egw at britewerkz.com]

well, I got the meters today.  They're phaostron units, and a phone call to
them talking to Tony who was involved in meter sales to R390a contractors
early in his career, reveals these are "most likely" 100 ohms.

He also told me from 1962 on wards, the spec on r-390a meters changed from
"s" for self-luminant to "p" for "phosphorescent", which means there may
well be many 390A meters pulled that are not radioactive at all.  How to
tell the diff, I haven't a clue...

Now to see about testing one of these puppies...

73, Brian