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 NEW Chassis Mounted Replacement Capa
Collins 51S-1 NEW Chassis Mounted Replacement Capa
Ends in 5 Hours 53 Minutes 24 Seconds
Current price: $53.99 (25 bids)
COLLINS 51S-1 - VARIABLE RESISTOR - RF GAIN - 25k
COLLINS 51S-1 - VARIABLE RESISTOR - RF GAIN - 25k
Ends in 1 Days 3 Hours 24 Minutes 55 Seconds
Current price: $14.99 (0 bids)
COLLINS 51S-1 - p/n 360-0136-000 - JACK - PHONES -
COLLINS 51S-1 - p/n 360-0136-000 - JACK - PHONES -
Ends in 1 Days 17 Hours 40 Minutes 32 Seconds
Current price: $17.59 (0 bids)
Collins 51S-1 Shock Mount Base-Shockmount -  bumpe
Collins 51S-1 Shock Mount Base-Shockmount - bumpe
Ends in 3 Days 3 Hours 29 Minutes 34 Seconds
Current price: $69.00 (0 bids)
AMPHENOL 86-CP9 9PIN OCTAL STYLE POWER ACCESSORY P
AMPHENOL 86-CP9 9PIN OCTAL STYLE POWER ACCESSORY P
Ends in 3 Days 6 Hours 18 Minutes 58 Seconds
Current price: $18.95 (8 bids)
COLLINS 51S-1 - CRYSTAL 11.000 MHz 11000 KHz - Y7
COLLINS 51S-1 - CRYSTAL 11.000 MHz 11000 KHz - Y7
Ends in 3 Days 18 Hours 57 Minutes 21 Seconds
Current price: $29.99 (1 bid)
Collins 51S-1 Receiver Choke Transformer
Collins 51S-1 Receiver Choke Transformer
Ends in 4 Days 1 Hours 25 Minutes 7 Seconds
Current price: $50.00 (0 bids)
COLLINS 51S-1 - DIAL SCALE - p/n 547-2615-003
COLLINS 51S-1 - DIAL SCALE - p/n 547-2615-003
Ends in 4 Days 1 Hours 42 Minutes 33 Seconds
Current price: $99.99 (0 bids)
COLLINS 51S-1 - MAIN SWITCH - p/n 259-1336-000
COLLINS 51S-1 - MAIN SWITCH - p/n 259-1336-000
Ends in 4 Days 1 Hours 48 Minutes 47 Seconds
Current price: $49.99 (0 bids)
COLLINS 51S-1 KWM-2 KWM-2A S-line -100kHz CALIBRAT
COLLINS 51S-1 KWM-2 KWM-2A S-line -100kHz CALIBRAT
Ends in 4 Days 1 Hours 52 Minutes 21 Seconds
Current price: $49.99 (0 bids)
COLLINS 51S-1 - CRYSTAL 12 MHz 12000 KHz - Y8 - p/
COLLINS 51S-1 - CRYSTAL 12 MHz 12000 KHz - Y8 - p/
Ends in 4 Days 1 Hours 57 Minutes 48 Seconds
Current price: $24.99 (1 bid)
COLLINS 51S-1 - SHAFT (TURRET ASSEMBLY) - p/n 548-
COLLINS 51S-1 - SHAFT (TURRET ASSEMBLY) - p/n 548-
Ends in 4 Days 2 Hours 2 Minutes 21 Seconds
Current price: $39.99 (0 bids)
COLLINS 51S-1 - TERMINAL BOARD - TB1 - p/n 367-734
COLLINS 51S-1 - TERMINAL BOARD - TB1 - p/n 367-734
Ends in 4 Days 5 Hours 43 Minutes 25 Seconds
Current price: $49.99 (0 bids)
COLLINS 51S-1 - ALUMINUM FILTER HOLDER ASSEMBLY -
COLLINS 51S-1 - ALUMINUM FILTER HOLDER ASSEMBLY -
Ends in 4 Days 5 Hours 47 Minutes 31 Seconds
Current price: $20.99 (0 bids)
COLLINS 51S-1 - FILTER COMPARTMENT COVER- p/n 547-
COLLINS 51S-1 - FILTER COMPARTMENT COVER- p/n 547-
Ends in 4 Days 5 Hours 51 Minutes 36 Seconds
Current price: $20.99 (0 bids)
Collins 51S-1 Power Supply Choke L109 Tested 100%
Collins 51S-1 Power Supply Choke L109 Tested 100%
Ends in 4 Days 19 Hours 17 Minutes 50 Seconds
Current price: $67.50 (0 bids)
Collins 51S-1 Power Supply Transformer Tested 100%
Collins 51S-1 Power Supply Transformer Tested 100%
Ends in 4 Days 19 Hours 23 Minutes 12 Seconds
Current price: $119.50 (0 bids)
Collins 51S-1 Signature Series Ham Radio Amateur R
Collins 51S-1 Signature Series Ham Radio Amateur R
Ends in 4 Days 22 Hours 46 Minutes 33 Seconds
Current price: $34.00 (4 bids)
COLLINS 51S-1 - FIDUCIAL WINDOW MECHANISM
COLLINS 51S-1 - FIDUCIAL WINDOW MECHANISM
Ends in 5 Days 2 Hours 57 Minutes 54 Seconds
Current price: $69.90 (1 bid)
Collins  51S-1 Communications Receiver,  Weighted
Collins 51S-1 Communications Receiver, Weighted
Ends in 5 Days 6 Hours 32 Minutes 17 Seconds
Current price: $31.99 (19 bids)
COLLINS 51S-1 - LAMPHOLDER - p/n 262-1210-000 - XD
COLLINS 51S-1 - LAMPHOLDER - p/n 262-1210-000 - XD
Ends in 5 Days 21 Hours 34 Minutes 32 Seconds
Current price: $19.99 (0 bids)
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 6 Days 1 Hours 2 Minutes 24 Seconds
Current price: $24.95 (0 bids)
COLLINS 51S-1 - CRYSTAL 16 MHz 16000 KHz - Y12 - p
COLLINS 51S-1 - CRYSTAL 16 MHz 16000 KHz - Y12 - p
Ends in 6 Days 2 Hours 27 Minutes 32 Seconds
Current price: $24.99 (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 6 Days 2 Hours 55 Minutes 28 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 6 Days 3 Hours 2 Minutes 47 Seconds
Current price: $79.00 (1 bid)
COLLINS 51S-1 - CLAMP - HARD TO FIND - p/n 504-753
COLLINS 51S-1 - CLAMP - HARD TO FIND - p/n 504-753
Ends in 6 Days 5 Hours 9 Minutes 41 Seconds
Current price: $24.99 (0 bids)
COLLINS 51S-1 Receiver  Vintage RARE 51S1 Roun Emb
COLLINS 51S-1 Receiver Vintage RARE 51S1 Roun Emb
Ends in 6 Days 12 Hours 12 Minutes 29 Seconds
Current price: $1,488.00 (0 bids)
COLLINS 51S-1 - PHONO JACK - RCA TYPE - p/n 360-01
COLLINS 51S-1 - PHONO JACK - RCA TYPE - p/n 360-01
Ends in 7 Days 6 Hours 36 Minutes 23 Seconds
Current price: $9.99 (2 bids)
COLLINS 51S-1 - DETENT - SPROCKET - p/n 269-2224-0
COLLINS 51S-1 - DETENT - SPROCKET - p/n 269-2224-0
Ends in 7 Days 18 Hours 12 Minutes 48 Seconds
Current price: $27.99 (1 bid)
Collins 51S-1 51S-1A 51S-1F Operating & Servic
Collins 51S-1 51S-1A 51S-1F Operating & Servic
Ends in 8 Days 9 Hours 52 Minutes
Current price: $15.00 (43 bids)
COLLINS 51S-1 - AF GAIN - LINE AF GAIN - KNOB - p/
COLLINS 51S-1 - AF GAIN - LINE AF GAIN - KNOB - p/
Ends in 8 Days 18 Hours 29 Minutes 9 Seconds
Current price: $49.99 (0 bids)
COLLINS 51S-1 - ALUMINUM COVER VIF - RF TUNING UNI
COLLINS 51S-1 - ALUMINUM COVER VIF - RF TUNING UNI
Ends in 8 Days 18 Hours 29 Minutes 15 Seconds
Current price: $19.99 (0 bids)
COLLINS 51S-1 - ALUMINUM PLATE - PART OF GEAR TRAI
COLLINS 51S-1 - ALUMINUM PLATE - PART OF GEAR TRAI
Ends in 8 Days 18 Hours 29 Minutes 31 Seconds
Current price: $9.99 (0 bids)
COLLINS 51S-1 - CHASSIS PLATE ( POWER SUPPLY ) - p
COLLINS 51S-1 - CHASSIS PLATE ( POWER SUPPLY ) - p
Ends in 8 Days 18 Hours 29 Minutes 52 Seconds
Current price: $19.99 (0 bids)
COLLINS 51S-1 - CRYSTAL 10.0 MHz 10000 KHz - Y6 -
COLLINS 51S-1 - CRYSTAL 10.0 MHz 10000 KHz - Y6 -
Ends in 8 Days 18 Hours 30 Minutes 6 Seconds
Current price: $24.99 (0 bids)
COLLINS 51S-1 - CW CRYSTAL FILTER - p/n 293-0928-0
COLLINS 51S-1 - CW CRYSTAL FILTER - p/n 293-0928-0
Ends in 8 Days 18 Hours 30 Minutes 26 Seconds
Current price: $99.99 (0 bids)
COLLINS 51S-1 - GEAR SECTOR DRIVE  part of GEAR TR
COLLINS 51S-1 - GEAR SECTOR DRIVE part of GEAR TR
Ends in 8 Days 18 Hours 30 Minutes 49 Seconds
Current price: $17.49 (0 bids)
COLLINS 51S-1 - ROTARY SWITCH WAFERS ASSEMBLY - p/
COLLINS 51S-1 - ROTARY SWITCH WAFERS ASSEMBLY - p/
Ends in 8 Days 18 Hours 31 Minutes 54 Seconds
Current price: $29.99 (0 bids)
COLLINS 51S-1 - RF COIL TURRET BOARD - 547-2685-00
COLLINS 51S-1 - RF COIL TURRET BOARD - 547-2685-00
Ends in 8 Days 21 Hours 24 Minutes 9 Seconds
Current price: $69.99 (0 bids)
COLLINS 51S-1 - GEAR SPUR-126T - from GEAR TRAIN A
COLLINS 51S-1 - GEAR SPUR-126T - from GEAR TRAIN A
Ends in 9 Days 1 Hours 37 Minutes 3 Seconds
Current price: $27.99 (0 bids)

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