The new National NC-108 FM Receiver/Tuner is a nine-tube plus rectifier and tuning indicator (the rack model employs a tuning meter) superheterodyne with ratio type FM detector. The frequency range is 87 - 109 mc. and the dial is calibrated in both megacycles and channels. There is a built-in 5" PM speaker for monitoring and VOLUME and TONE controls are operative on both self contained and external audio systems. The NC-108 is designed primarily to serve as the nucleus of a high fidelity installation for the reception and reproduction of FM broadcast entertainment. It can be used in conjunction with any public address or other audio amplifier-loud speaker system or with any conventional broadcast or short wave receiver. The built-in speaker can be switched on or off from the front panel as desired. The NC-108 may also be used as an FM receiver complete in itself---the monitoring speaker affords thoroughly enjoyable listening.
TUBE COMPLEMENT:
| R.F. Amplifier | 6BA6 |
| Mixer | 6AG5 |
| Heterodyne Osc. | 6C4 |
| 1st, 2nd, and 3rd I.F. Amplifiers | (3) 6SG7 |
| Ratio discriminator | 6H6 |
| 1st Audio | 6SJ7 |
| Monitor, Power amplifier | 6V6GT/G |
| Tuning indicator (on table model only) | 6U5/6G5 |
| Rectifier | 5Y3GT |
SENSITIVITY: With 22.5 kc. deviation, a 7 microvolt signal gives 8 volts of audio at output terminals with less than 2% distortion.
SELECTIVITY: I.F. bandwidth 150 kc. at 3 db. down and 600 kc. at 60 db. down.
IMAGE REJECTION: Approximately 40 db.
FIDELITY: Overall response flat within 2 db. from 50 to 18,000 cycles. Standard RMA de-emphasis can be cut in or out as desired.
AUDIO OUTPUT: Maximum audio voltage delivered to output terminals is approximately 10 volts. Input circuit of the following amplifier should be high impedance.
POWER REQUIREMENTS: Both the NC-108R and NC-108T operate from 110/125 V. 50/60 cycles A.C.
PHYSICAL DATA: NC-108R panel height 8 3/4", 25 lbs. net (31 lbs. packed for shipment), depth behind panel 8 3/4" overall, Black Wrinkle finish. NC-108T 16 9/16" x 8 3/4" x 8 1/2", 24 lbs. net (30 lbs. packed for shipment), smooth Gray Enamel finish.
PRICES:
| NC-108R Rack Model | Net $115.00 |
| NC-108T Table Model | Net $99.50 |
| TB-1 Tilt Base for the Table Model | Net $3.95 |
Source: National Radio Products 1948 catalog.
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