Collins 75A-2 
Tube List: 0A2 (1), 5Y3GT (1), 6AL5 (3), 6AQ5 (1), 6BA6 (6), 6BA7 (2), 6CB6 (1), 12AT7 (1), 12AX7 (1). Description: The Collins 75A-2 receiver is dual conversion and covers the 160 thru 10 meter amateur bands. Selectivity choices include five positions for the crystal filter (approximately 5 kc to 200 cps bandwidth) and that of the 455 kc IF transformers for AM operation. The crystal phasing circuit provides a tunable notch rejection for phasing out interference heterodynes. Operating modes for the receiver include AM, CW, MCW. Accurate tuning is accomplished through the use of a slide rule drum dial calibrated in .1 Mc and a vernier dial calibrated in 1 kc increments (2 kc increments on the 10 and 11 meter bands). Separate noise limiters are used for AM and CW operation. Front panel controls include: Band Switch, Main Tuning, Tuning Zero Set, On-Off-Standby Switch, RF Gain, AF Gain, Crystal Selectivity Switch, Crystal Phasing Control, CW-AM-FM Mode Switch, CW Pitch Control, Noise Limiter - Calibrate Switch, CW Limiter Control, and Antenna Trim. An optional 100 kc crystal calibrator (8R-1) is available as a plug-in unit. Other options include a plug-in NBFM adapter (148C-1) and external cabinet mounted speaker (270G-2). Specifications: FREQUENCY RANGE: 160 Meters: 1.5 - 2.5 Mc 80/75 Meters: 3.2 - 4.2 Mc 40 Meters: 6.8 - 7.8 Mc 20 Meters: 14.0 - 15.0 Mc 15 Meters: 20.8 - 21.8 Mc 11 Meters: 26.0 - 28.0 Mc 10 Meters: 28.0 - 30.0 Mc MODES: AM, CW, MCW TYPE OF SERVICE: Fixed Station operation. POWER REQUIREMENTS: 115 vac, 50-60 cycles; power consumption is approximately 85 watts. IMAGE AND SPURIOUS REJECTION: Image rejection better than 50 dB. IF rejection is better than 50 dB CALIBRATOR: 100 kc crystal oscillator (optional). FREQUENCY STABILITY: Drift is negligible after warm-up and varies only slightly with line voltage variations. BANDSPREAD: Approximately ten turns of the vernier dial per frequency range. VISUAL DIAL ACCURACY: Within 1 kc (160 - 15 meter bands), within 2 kc (10 and 11 meter bands). SENSITIVITY: 2 uv for 10 dB signal-to-noise ratio. SELECTIVITY: Crystal Filter, 5 positions: 4 kc to 200 cycles nominal (6.0 dB points). Fixed I.F.: 13 kc (60 dB points). AVC: Audio output level is within 6 dB for an RF input change of 5 uv to .5 v. Delayed, amplified AVC circuit. VARIABLE FREQUENCY OSCILLATOR: 70E-12 permeability tuned oscillator (PTO). ANTENNA INPUT IMPEDANCE: 50 to 150 ohms nominal (unbalanced, balanced). AUDIO OUTPUT LEVEL: 2.5 watt at AGC threshold. AUDIO OUTPUT REQUIREMENTS: Speaker: 3-4 ohms / 500 ohms. PROTECTIVE DEVICES: Fuse in ac line. SIZE: Receiver: 21 1/8" W, 12 1/2" H, 13 1/4" D. WEIGHT: 70 lbs (shipping wt). |
