[Boatanchors] NC-183 versus NBS-1 help

[jeremy-ca]

Does anyone have a picture or link to a front panel that clearly shows the 
control functions? Or just a listing will help.

So far I have found the NBS-1 differs:

No noise limiter

Three position IF selectivity switch, Broad, Medium, Sharp. VERY interesting 
as this is the only National that Im aware of that has this. Somewhat 
similar to the old Super Pros. This might make an excellent BCB DXer.

No AM position as such, the mode switch says Phono, MCW, CW

Carl
KM1H