Restored National NC-57B receiver. Electrical condition is
excellent, cabinet is good (some paint wear). The two tuning
knobs are not original but very close. The 57B differs from
the model 57 in that the detected audio is routed to a rear
connector to allow use of the Select-O-Ject (not included).
The following restoration work was done this year:

replaced all capacitors
replaced most resistors
new speaker and output transformer
new tubes (NOS)
complete alignment

You can see pictures of it he
http://www.greenapple.com/~sbertsch/k8zg/boatanchors/

Additional information from the 1948 National catalog:
http://www.io.com/~nielw/nat_list/nc57.htm
http://www.io.com/~nielw/nat_list/selec.htm
http://www.io.com/~nielw/nat_list/SM57.HTM

This receiver is quite sensitive, ten feet of antenna wire
strung indoors is enough for SW broadcast listening.

It was a fun project, but I've got too many projects and
not enough room. Asking $125, op/service manual included,
local pickup/delivery in Columbus area only. Trades for
other cool stuff will be considered.