National NC-183D s/n 357 0786
NORMAL FEATURES # 0.54 to 31. mc. plus 47-55 mc frequency coverage. # Calibrated amateur band spread for 6, 10-11, 15, 20, 40 and 80 meter bands. # Two R.F. amplifier stages for excellent sensitivity. # Three I.F. amplifier stages for improved selectivity. # Double conversion on the A, B and C bands for a high order of image rejection (62 db. on 10 meters). # Double-diode noise limiter effective on both phone and C.W. reception. # A wide range crystal filter with 6 uniform steps of selectivity variation. # A.V.C. for both phone and C.W. reception. # S-meter with adjustable sensitivity for phone and C.W. reception. # Stabilized voltage regulated circuits and push-pull audio output stage. # Accessory connector socket and phonograph input jack.
ADDED FEATURES IN THIS RADIO
# Product Detector
# 1st & 2nd Mixer Filaments on at all times - added transformer
click on pix for full size
Paint is original, there are various scratches, etc., but nothing terrible
A product detector was installed as described in an article in the Dec. 1992 ER magazine. A 6SN7 tube was utilized, plugged into the accessory socket. This makes SSB listening a real pleasure.
All "BBOD's" and any other questionable capacitor or resistor has been replaced. Many originals were tested and found to be within specs, so were left in the circuit.
showing the bottom cover