[R-1051] New R-1051B(?) owner with questions

[Adam Vaughn]

Hello everyone! I recently picked up what I believe to be an R-1051B, a picture of which can be seen here:

http://www.electronixandmore.com/adam/temp/r1051b_lit.jpg

As can be seen from the photo, it's missing it's ID tag, and has been converted for LED lighting. Several of the small knobs are cracked, but the receiver seems to work fairly well. I have some questions about the unit:

1. Is it possible to find out the manufacturer, as well as the serial number, from somewhere other than the ID tag? I know that some R-39x receivers had a stamp on the back of the chassis with ID info, but have yet to remove this receiver fully from it's case to check and see if this sort of thing is true for R-1051x receivers. Since it has 100cps increments on the fine tuning control, I assume it to be at least an R-1051B, but am not entirely sure.

2. Does anyone know what the official designations for the power and audio connectors is?  Mine is missing mating connectors for these, and I'd like to know what to look for.

3. Does anyone know what the "Field Changes" for these receivers entailed? My receiver has a sticker on the far left side which has the heading "Field Changes Accomplished", and the numbers 1, 2, 3, and 4 written in squares on it. I have yet to find out any info on what these field changes might have involved.

Thanks in advance!
-Adam

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Adam Vaughn
Collector of old computers, video game systems, radios and other electronic
equipment...
Visit my page at
http://www.electronixandmore.com/adam/index.html