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Collins 75A-1

75A-1
Amateur Band Communications Receiver Rating (1-5): HHHHH (5)
Made In: United States 1947-1950 Voltages: 115 VAC 50-60 Hz
Coverage: Ham. See Comments. Readout: Analog Lin.
Modes: AM/CW/MCW Selectivity: 4-.2 kHz 5 steps
Circuit: Double Conversion Superheterodyne. 14 Tubes. Physical: 21.125x12.25x13.9" 57 Lbs. 536x311x352mm 25.8 kg
Circuit Complement: 6AK5 RF Amp, 6SA7 1st Mixer, 6SK7 IF Amp, 6L7 2nd Mixer, 6AK5 Crystal Osc, (2) 6SG7 500 kHz IF Amp, 6H6 Detector/NL, 6SJ7 AVC, 6SJ7 BFO, 6SJ7 1st Audio Amp, 6V6 Audio Power Amp, 6SJ7 VFO and 5Y3GT Rectifier. Uses 70E-7 sealed VFO. IF 1500-2500, 500 kHz.
Features: " Head. Jack S-Meter ANL Hinged Cover RF Gain BFO Mute AVC ON/OFF Dial Lamp Standby Fiduciary Adj.
Accessories: 353C-14 1.4 kHz Mechanical Filter Adapter, 270G-1 Speaker, 353C-31 3.1 kHz Mechanical Filter Adapter, 307E-1 Gear Reduction Knob, 353C-60 6 kHz Mechanical Filter Adapter
New Price: $375 Used Price: $250-490
Comments: One view is that the 75A-1 was simply referred to as the Collins 75A until the 75A-2 came out in 1950. Another theory suggests that a small run of less than 200 75As were made in 1946. Ranges: 3.2-4.2, 6.8-7.8, 14-15, 20.8-21.8, 26-28 and 28-30 MHz. Only the band in use is illuminated. Dial accuracy is to 1 kHz (2 kHz above 26 MHz). Virtually no backlash. St. James gray wrinkle finish. Requires a speaker.

Collins 75A-3

75A-3
Amateur Band Communications Receiver Rating (1-5): HHHHH (5)
Made In: United States 1952-1954 Voltages: 115 VAC 50-60 Hz
Coverage: Ham. See Comments. Readout: Analog Lin.
Modes: AM/CW/MCW/FM Selectivity: 3/_ & 2.4-.2 kHz 5 steps
Circuit: Double Conversion Superheterodyne. 18 Tubes. Physical: 21.125x12.5x13.13" 50 Lbs. 536x317x333mm 22.7 kg
Circuit Complement: 6CB6 RF Amp, 6BA7 1st Mixer, 6BA7 2nd Mixer, 12AT7 Crystal Osc, (3) 6BA6 455 kHz IF Amp, 6AL5 Det/AVC Rect. 12AX7 AVC Amp/AF Amp, 6AL5 ANL, 6AQ5 Audio Power Amp, 6BA6 BFO, 5Y3GT Power Rect, 6BA6 VFO, 6BA6 VFO Isolation, 6AL5 CW NL, 0A2 Voltage Reg., 6BA6 455 kHz IF Amp. Uses 70E-12 sealed VFO. IF 1500-2500, 500 kHz.
Features: " Head. Jack S-Meter Antenna Trimmer AGC OFF/SLO/FST RF Gain Hinged Cover Mute Line Out 500 ohms Dial Set Adjust CW Limiter Dial Lamp ANL BFO
Accessories: 270G-2 Speaker, 148C-1 NBFM Adapter, 8R-1 Calibrator 100 kHz, F445B-08 800 Hz Filter, F455B-60 6 kHz Filter, 307E-1 Gear Reduction Knob
New Price: $530 Used Price: $320-500
Comments: Frequency bands, tuning and dial accuracy is the same as the 75A-2. St. James gray wrinkle finish. Requires speaker. The 75A-3 saw the introduction of the famous Collins Mechanical Filter. A two position concentric switch under the BFO knob selects the supplied 3 kHz or the optional 800 Hz mechanical filter.

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