[R-390] Receiver classification and cabinet comment

[Don Heywood]

Hello all, during all the years I have been involved with the R-390 family 
starting in 1963 on the submarine Sailfish, have any of the equipment or 
technical manuals been classified. I do however have an R-391 manual which 
is marked "restricted", this is a preliminary draft and probably was marked 
for company security. This is the one with the interesting spelling, i.e. 
"alinement"...
Concerning the cabinet issue, no one has yet to mention that a lot of the 
extra heat generated is due to the higher household voltage nowadays. I use 
bucking transformers on all my equipment, including the Collins A-line and 
S-line equipment save the 30L-1 and 30S-1...Most of my gear sees 113VAC. I 
do point small fans at the side of the R-390's regulator tubes. I have never 
had any heat related problems with the "A" models, even in a proper cabinet, 
receiving the proper AC input.

73
Don WC4G
Charleston, SC