Collins 51S

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Art Collins founded Collins Radio Company in 1933 in Cedar Rapids, Iowa for the purpose of designing and producing both shortwave and AM broadcast radio equipment and equipment.

The company introduced their first amateur radio receiver, the 75A-1 around 1947. This unit achieved excellent stability due to high build quality and the use of a permeability tuned oscillator (PTO) in its second conversion stage. It was one of the few dual-conversion superheterodyne receivers manufactured at that time and was designed to receive only the amateur bands.

The 75A amateur line was continued throughout the early 50s, ending with the 75A-4, released in 1955. The Collins mechanical filter was introduced in the 75A-3, and the 75A-4 was one of the first receivers marketed specifically as a single sideband receiver.

In 1958 the 75A series was replaced with the much smaller 75S series, part of the S/Line. These top-end receivers featured mechanical filters, excellent stability and very accurate frequency readout.

With the introduction of the S/Line in 1958, Collins moved to an integrated equipment system, making them the first manufacturer to take this approach. Collins was also introduced a compact HF transceiver, the KWM-1, the year before. These two innovations put Collins ahead of its competition and set the stage for other amateur radio equipment makers and the next generation of HF radios.

In 1978, the S/Line came to an end after a two decade run. The KWM-380 transceiver was introduced the next year – innovative in its use of transistors and digital technology, and its styling. It was Collins’ final entry in the amateur radio market until it was discontinued in the mid-1980s.

The Collins Radio Company was purchased by Rockwell International in 1973. In 2001 the avionics division of Rockwell International was spun off to form the current Rockwell Collins, Inc., retaining its name. Rockwell Collins serves the defense and commercial avionics industries and no longer markets receivers to the public. The company today employs over 19,000 people.

More information on Collins Radio:
Wikipedia reference on Collins Radio
Collins Collectors Association
Virtual Collins Radio Museum

Collins 51S EBay Bargains!

COLLINS 51S-1 - REJECTION TUNING VARIABLE RESISTOR
COLLINS 51S-1 - REJECTION TUNING VARIABLE RESISTOR
Ends in 5 Hours 20 Minutes 27 Seconds
Current price: $59.99 (0 bids)
COLLINS 51S-1 - AF GAIN - LINE AF GAIN - KNOB - p/
COLLINS 51S-1 - AF GAIN - LINE AF GAIN - KNOB - p/
Ends in 5 Hours 23 Minutes 14 Seconds
Current price: $49.99 (0 bids)
COLLINS 51S-1 - MAIN SWITCH - p/n 259-1336-000
COLLINS 51S-1 - MAIN SWITCH - p/n 259-1336-000
Ends in 5 Hours 26 Minutes 38 Seconds
Current price: $59.99 (0 bids)
COLLINS 51S-1 - p/n 360-0136-000 - JACK - PHONES -
COLLINS 51S-1 - p/n 360-0136-000 - JACK - PHONES -
Ends in 5 Hours 46 Minutes 50 Seconds
Current price: $19.99 (0 bids)
COLLINS 51S-1 - ZERO SET - KNOB - p/n 544-7268-002
COLLINS 51S-1 - ZERO SET - KNOB - p/n 544-7268-002
Ends in 5 Hours 55 Minutes 6 Seconds
Current price: $19.99 (0 bids)
COLLINS 51S-1 - METER LEVER SWITCH with KNOB - p/n
COLLINS 51S-1 - METER LEVER SWITCH with KNOB - p/n
Ends in 5 Hours 58 Minutes 38 Seconds
Current price: $39.99 (0 bids)
COLLINS 51S-1 - VARIABLE RESISTOR - RF GAIN - 25k
COLLINS 51S-1 - VARIABLE RESISTOR - RF GAIN - 25k
Ends in 16 Hours 5 Minutes 29 Seconds
Current price: $14.99 (0 bids)
Rola Co.  Headset Adapter MC-385-C High To Low Imp
Rola Co. Headset Adapter MC-385-C High To Low Imp
Ends in 1 Days 17 Hours 33 Minutes 45 Seconds
Current price: $24.95 (0 bids)
COLLINS 51S-1 - PLASTIC TRIM RING - p/n 609-0573-0
COLLINS 51S-1 - PLASTIC TRIM RING - p/n 609-0573-0
Ends in 2 Days 7 Hours 7 Minutes 13 Seconds
Current price: $99.99 (0 bids)
COLLINS 51S-1 - MEGACYCLES KNOB - p/n 548-8244-000
COLLINS 51S-1 - MEGACYCLES KNOB - p/n 548-8244-000
Ends in 3 Days 14 Hours 5 Minutes 29 Seconds
Current price: $59.99 (0 bids)
COLLINS 51S-1 - ESCUTCHEON PLATE with SCREWS - p/n
COLLINS 51S-1 - ESCUTCHEON PLATE with SCREWS - p/n
Ends in 3 Days 14 Hours 9 Minutes 56 Seconds
Current price: $149.99 (0 bids)
COLLINS 51S-1 - PTO COUPLER ASSEMBLY
COLLINS 51S-1 - PTO COUPLER ASSEMBLY
Ends in 4 Days 5 Hours 44 Minutes 55 Seconds
Current price: $42.49 (0 bids)
COLLINS 51S-1 - SHOCK MOUNT SHOCKMOUNT SHOCK ABSOR
COLLINS 51S-1 - SHOCK MOUNT SHOCKMOUNT SHOCK ABSOR
Ends in 4 Days 13 Hours 38 Minutes 15 Seconds
Current price: $9.99 (1 bid)
Collins 51S-1 NEW Chassis Mounted Replacement Capa
Collins 51S-1 NEW Chassis Mounted Replacement Capa
Ends in 5 Days 18 Hours 7 Minutes 28 Seconds
Current price: $44.99 (20 bids)
COLLINS 51S-1 HF RECEIVER “REPAIR”
COLLINS 51S-1 HF RECEIVER “REPAIR”
Ends in 6 Days 22 Hours 2 Minutes 56 Seconds
Current price: $300.00 (1 bid)
COLLINS 51S-1 - p/n 360-0136-000 - JACK - PHONES -
COLLINS 51S-1 - p/n 360-0136-000 - JACK - PHONES -
Ends in 7 Days 5 Hours 54 Minutes 36 Seconds
Current price: $16.99 (0 bids)
COLLINS 51S-1  - AF TRANSFORMER T-8 -  p/n 667-030
COLLINS 51S-1 - AF TRANSFORMER T-8 - p/n 667-030
Ends in 7 Days 17 Hours 20 Seconds
Current price: $55.00 (0 bids)
TWO (2) #47 6.3 VOLT BULBS for Collins 51S1 / 75S-
TWO (2) #47 6.3 VOLT BULBS for Collins 51S1 / 75S-
Ends in 7 Days 19 Hours 4 Minutes 59 Seconds
Current price: $4.95 (0 bids)
COLLINS 51S-1  - AF TRANSFORMER T-8 -  p/n 667-030
COLLINS 51S-1 - AF TRANSFORMER T-8 - p/n 667-030
Ends in 9 Days 5 Hours 42 Minutes 53 Seconds
Current price: $54.99 (0 bids)
COLLINS 51S-1 - CRYSTAL 11.000 MHz 11000 KHz - Y7
COLLINS 51S-1 - CRYSTAL 11.000 MHz 11000 KHz - Y7
Ends in 9 Days 7 Hours 11 Minutes 25 Seconds
Current price: $24.99 (0 bids)
Wire Pro 86CP9 Amphenol 9 Pin octal style plug phe
Wire Pro 86CP9 Amphenol 9 Pin octal style plug phe
Ends in 9 Days 12 Hours 52 Minutes 4 Seconds
Current price: $12.95 (0 bids)
COLLINS 51S-1 - CRYSTAL 12 MHz 12000 KHz - Y8 - p/
COLLINS 51S-1 - CRYSTAL 12 MHz 12000 KHz - Y8 - p/
Ends in 9 Days 14 Hours 11 Minutes 52 Seconds
Current price: $24.99 (1 bid)
COLLINS 51S-1 - BANDPASS FILTER -  FL1 -  p/n 241-
COLLINS 51S-1 - BANDPASS FILTER - FL1 - p/n 241-
Ends in 9 Days 17 Hours 27 Minutes 41 Seconds
Current price: $49.99 (0 bids)
COLLINS 51S-1 - TERMINAL BOARD - TB1 - p/n 367-734
COLLINS 51S-1 - TERMINAL BOARD - TB1 - p/n 367-734
Ends in 9 Days 17 Hours 57 Minutes 29 Seconds
Current price: $25.49 (0 bids)
COLLINS 51S-1 - ALUMINUM FILTER HOLDER ASSEMBLY -
COLLINS 51S-1 - ALUMINUM FILTER HOLDER ASSEMBLY -
Ends in 9 Days 18 Hours 1 Minutes 35 Seconds
Current price: $25.49 (0 bids)
COLLINS 51S-1 - FILTER COMPARTMENT COVER- p/n 547-
COLLINS 51S-1 - FILTER COMPARTMENT COVER- p/n 547-
Ends in 9 Days 18 Hours 5 Minutes 40 Seconds
Current price: $25.49 (0 bids)
COLLINS 51S-1 - PTO - COUPLER
COLLINS 51S-1 - PTO - COUPLER
Ends in 9 Days 18 Hours 34 Minutes 57 Seconds
Current price: $33.99 (0 bids)
Collins 51S-1 Signature Series Ham Radio Amateur R
Collins 51S-1 Signature Series Ham Radio Amateur R
Ends in 10 Days 11 Hours 37 Seconds
Current price: $40.00 (3 bids)
COLLINS 51S-1 - FIDUCIAL WINDOW MECHANISM
COLLINS 51S-1 - FIDUCIAL WINDOW MECHANISM
Ends in 10 Days 15 Hours 11 Minutes 58 Seconds
Current price: $69.90 (0 bids)
Collins 51S-1 Receiver  Weighted PTO Knob Insert S
Collins 51S-1 Receiver Weighted PTO Knob Insert S
Ends in 10 Days 18 Hours 46 Minutes 21 Seconds
Current price: $32.99 (2 bids)
COLLINS 51S-1 - DIAL DRIVE-
COLLINS 51S-1 - DIAL DRIVE-
Ends in 11 Days 13 Hours 8 Minutes 47 Seconds
Current price: $79.00 (1 bid)
COLLINS-51S-1-32S-3-KWM-2-S-LINE-KNOB-p/n 543-8039
COLLINS-51S-1-32S-3-KWM-2-S-LINE-KNOB-p/n 543-8039
Ends in 11 Days 13 Hours 16 Minutes 28 Seconds
Current price: $24.95 (0 bids)
Collins 51s-1 CW Filter 800Hz p/n 293-0928-000
Collins 51s-1 CW Filter 800Hz p/n 293-0928-000
Ends in 11 Days 15 Hours 9 Minutes 32 Seconds
Current price: $79.00 (0 bids)
Collins 51s-1 Mechanical USB Filter 2.75 KHz p/n 5
Collins 51s-1 Mechanical USB Filter 2.75 KHz p/n 5
Ends in 11 Days 15 Hours 16 Minutes 51 Seconds
Current price: $79.00 (0 bids)
Collins 51s-1 Mechanical LSB Filter 2.75 KHz p/n 5
Collins 51s-1 Mechanical LSB Filter 2.75 KHz p/n 5
Ends in 11 Days 15 Hours 19 Minutes 58 Seconds
Current price: $79.00 (0 bids)
Canadian Military Made Collins 51S-1 Miniature Rec
Canadian Military Made Collins 51S-1 Miniature Rec
Ends in 11 Days 17 Hours 1 Minutes 3 Seconds
Current price: $8,506.62 (0 bids)
COLLINS 51S-1 Receiver  Vintage RARE 51S1 Roun Emb
COLLINS 51S-1 Receiver Vintage RARE 51S1 Roun Emb
Ends in 12 Days 30 Minutes 20 Seconds
Current price: $1,488.00 (0 bids)
COLLINS 51S-1 - DIAL SCALE - p/n 547-2559-002
COLLINS 51S-1 - DIAL SCALE - p/n 547-2559-002
Ends in 12 Days 9 Hours 49 Minutes 26 Seconds
Current price: $89.90 (0 bids)
COLLINS 51S-1 - S-line - ROUND EMBLEM - INSIGNIA -
COLLINS 51S-1 - S-line - ROUND EMBLEM - INSIGNIA -
Ends in 12 Days 9 Hours 57 Minutes 48 Seconds
Current price: $79.90 (0 bids)
AMPHENOL 78-S9 9 PIN POWER SOCKET FOR LESLIE JOHNS
AMPHENOL 78-S9 9 PIN POWER SOCKET FOR LESLIE JOHNS
Ends in 12 Days 16 Hours 10 Minutes 1 Seconds
Current price: $22.95 (6 bids)

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