NC-108

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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