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Favorite Tube-Type Shortwave Receivers


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Collins 51J-4

51J-4
General Coverage Communications Receiver Rating (1-5): HHHHH (5)
Made In: United States 1957-1963 Voltages: 115/230 VAC 45-70 Hz
Coverage: 540 - 30500 kHz Readout: Analog Lin.
Modes: AM/CW Selectivity: Dependent on filter.
Circuit: Triple Conversion Superheterodyne. 19 Tubes. Physical: 21.125x12.5x13.13" 55 Lbs. 536x317x333mm 24.9 kg
Circuit Complement: Same tube complement as the 51J-3 except for an additional 6BA6 4th 500 kHz IF Amp. Conversion: triple .54-1.5, single 1.5-3.5, double 3.5-30.5 MHz. Uses 70E-15 VFO.
Features: " Head. Jack S/AF Meter ANL Antenna Trimmer RF Gain BFO Mute AVC ON/OFF Dial Set Adjust IF Out Jack Rack Handles Speaker Jack Dial Lamp Standby
Accessories: 270G-3 Speaker, F500B-08 800Hz Filter, F500B-14 1400Hz Filter, F500B-31 3100Hz Filter, F500B-60 6000Hz Filter, Tabletop cabinet
New Price: $1200-1464 Used Price: $610-950
Comments: Similar to model 51J-3, but now with a mechanical filter. Note the concentric filter selection switch on BFO knob. Designed for 19" rack mount (most common). The inside top cover features a schematic. Requires a speaker.
Variants: A variety exists with gray front panel and black lettering. For F.A.A.?
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Collins 51S-1

51S-1
General Coverage Communications Receiver Rating (1-5): HHHHH (5)
Made In: United States 1959-1975 Voltages: 115/230 VAC 50-400 Hz
Coverage: 200 - 30000 kHz Readout: Digital Mech. to 100 kHz then Analog Lin.
Modes: AM/LSB/USB/CW Selectivity: 5/2.75/.8 kHz -6dB.
Circuit: Triple Conversion Superheterodyne. 17 Tubes plus Semi. Physical: 14.75x6.6x13.18" 26 Lbs. 375x167x332mm 11.8 kg
Features: " Head. Jack S-Meter Hinged Top Cover Calibrator 100 kHz RF Gain Rejection Tuning Mute Ext. VFO Jack IF Out Jack Dial Lock Zero Set Atten. 10 dB Sidetone Jack Dial Brake (late prod.)
Accessories: 55G-1 LF/MF Preselector/Speaker, 351R-1 Rack Mount Kit, CC-2 Carry Case, 350D-5 Shock Mount, 312C-1 Rack Mount Speaker, 312B-3 Speaker, 200Hz Filter, 3200Hz Filter, 6000Hz Filter
New Price: $1500-2567 Used Price: $1100-2100
Comments: Double conversion above 7 MHz. 400 Hz dial accuracy. Tunes in thirty 1 MHz bands. Requires a speaker. An outstanding receiver and a very long lived model. Early units had white S-Meter, later had brown S-Meter, dial-lock and round logo. Very late units substituted mechanical AM filter for T4 & T5.
Variants: Model 51S-1A (R-1430/UR) is 28VDC. Model 51S-1B is equipped with an IF Out Jack on the rear. Model 51S-1F is rack mounted with 2.4/.8 kHz (R-1156/GR), also model 51S-1F with 2.75 kHz (R-1156A/GR). Model 51S-1AF is 28 VDC, rack mounted version with 2.4/.8 or 2.75 kHz. Also see LTV model G133 in Shortwave Receivers Past & Present.

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