[R-390] R-390A dating

[R390rcvr@aol.com]

David:

The 1st thing to check in your case is the number of fuses on the back panel. 
1 or 3? The 54 contract, one fuse. The 56 contract had one fuse until # 2683, 
then 3. All the 58 contract had 3.

You can sometimes get dates off installed components, such as the line 
filters, etc. Obviously, may have been changed, but not often. The filter caps often 
are changed and are dated but less reliable.

Lots of other tips if you are interested in further refinement of your 
dating. As many others will tell you, often they have been through the depot refurb 
process, where everything is shuffled around, and you end up with a mongrel, 
aka depot dog. Still good radios, but more mutt like. Hard to tell who the 
parents were!

Randy


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