Website credits: The below datasheet was obtained from Niel Wiegand's National Radio website http://www.io.com/~nielw/nat_list/nat_list.htm
The NC-240D is a professional communications receiver in every sense. Sturdy and dependable, it uses a cast aluminum coil set carriage for all tuned stages and a positive drive mechanism. All coils are on polystyrene forms with air trimmers used throughout. It is truly stable and selective.
Designed for the radio amateur, the NC-240D receiver is also suitable for general communications service in the 490 to 30,000 kc. range. Calibrated electrical bandspread tuning is provided for the 80, 40, 20, 11-10 meter Amateur bands.
|1st I.F. Amp.||6SK7|
|2nd I.F. Amp.||6K7|
|A.V.C., push-pull Audio Output||(3) 6V6|
|General Coverage||Band Spread|
|490 kc. - 30 Mc.||27 - 30 Mc.|
|14 - 14.4 Mc.|
|7 - 7.3 Mc.|
|3.5 - 4 Mc.|
SENSITIVITY: Less than I microvolt input produces a 6 db. signal/noise ratio.
SELECTIVITY: Crystal Filter OFF
|Voltage Ratio||Nominal Bandwidth|
|6 db.||4.0 kc.|
|60 db.||22.0 kc.|
Crystal Filter In - 20 db.
|5||Max Selectivity - 200 cycles.|
A.V.C. CHARACTERISTIC: Constant within +-3 db. from 10. to 100,000 microvolts input.
IMAGE REJECTION: Above 50 db. up to 10 Mc. Above 40 db. up to 15 Mc. Above 30 db. up to 30 Mc.
AUDIO FIDELITY: The frequency response of the audio system is flat within +- 2 db. from 50 cycles to 10,000 cycles.
POWER INPUT: Approximately 70 watts; either 110-120 or 220-240 volts 50/60 cycle, Phase a.c., A plug and socket is provided for convenient external connection for battery operation.
POWER OUTPUT: A 10,000 ohm output circuit delivers 8 watts with negligible distortion.
Table Model: NC-240DT; 19 1/4" x 10 5/8" x 15 1/2": Weight- 60 Lbs., Finish -- Gray Wrinkle; Enclosure -- Cabinet.
Rack Model: NC-240DR; 19" x 10 1/2" x 17 1/2"; Weight- 65 Lbs.; depth behind panel 14 7/8" overall; Finish -- Gray Wrinkle; Enclosure -- Dust Cover.
Rack or Table Model (with tubes) Net $225.00
NC-2RS (Rack) or NC-2TS (Table) Speaker Net $16.44
Source: National Radio Products 1948 Catalog, Picture from WA1KPD
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