Re: [Amateur-repairs] Creating a LSB and USB Test Signal!!

They did this so that there could be a number of different voltages used for the filament voltage for "portable" or mobile use.
You have to be very careful when wiring up the AC cord for Collins or you can easily wire it for the wrong voltage.
Also of note is often with extended use the alignment key on the 11 pin (IIRC) on the socket in the chassis can wear and the plug inserted incorrectly and zip go all of your tubes as well. 
The 51S1 was uses extensively by the ASA (Army Security Agency) in the Vietnam era. It was used as a light receiver where the big boat anchors were a little cumbersome. Two were used in helicopters for RDF (and other unspecified uses).
When used with the Collins transmitters of the series they would allow almost full coverage of the range. 
All of this is from a very poor memory of way back then.
JD
KE4MD

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