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: • ¼" 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

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: •¼" 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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