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 - RF TRANSFORMER - T16 - p/n 278-063
COLLINS 51S-1 - RF TRANSFORMER - T16 - p/n 278-063
Ends in 9 Hours 59 Minutes 54 Seconds
Current price: $19.99 (3 bids)
COLLINS 51S-1 - TRANSFORMER ASSY T12  T13 - p/n 27
COLLINS 51S-1 - TRANSFORMER ASSY T12 T13 - p/n 27
Ends in 10 Hours 3 Seconds
Current price: $19.99 (2 bids)
COLLINS 51S-1 - TRANSFORMER ASSY T14  T15 - p/n 27
COLLINS 51S-1 - TRANSFORMER ASSY T14 T15 - p/n 27
Ends in 10 Hours 8 Seconds
Current price: $19.99 (1 bid)
COLLINS 51S-1 - CW CRYSTAL FILTER - p/n 293-0928-0
COLLINS 51S-1 - CW CRYSTAL FILTER - p/n 293-0928-0
Ends in 1 Days 4 Hours 15 Minutes 3 Seconds
Current price: $95.99 (0 bids)
9 pin female power connector for Collins 51-S1 wit
9 pin female power connector for Collins 51-S1 wit
Ends in 1 Days 5 Hours 17 Minutes 51 Seconds
Current price: $39.95 (0 bids)
COLLINS 51S-1 - REJECTION TUNING VARIABLE RESISTOR
COLLINS 51S-1 - REJECTION TUNING VARIABLE RESISTOR
Ends in 1 Days 8 Hours 49 Minutes 10 Seconds
Current price: $47.99 (0 bids)
POWER CORD FOR COLLINS 51S-1
POWER CORD FOR COLLINS 51S-1
Ends in 1 Days 10 Hours 3 Minutes 45 Seconds
Current price: $32.95 (165 bids)
COLLINS 51S-1 - SHOCKMOUNT BASE 350D-5 - p/n 522-3
COLLINS 51S-1 - SHOCKMOUNT BASE 350D-5 - p/n 522-3
Ends in 2 Days 4 Hours 33 Minutes 1 Seconds
Current price: $244.99 (0 bids)
COLLINS 51S1 RECEIVER KNOB MEGACYCLE KNOB   KWM2 7
COLLINS 51S1 RECEIVER KNOB MEGACYCLE KNOB KWM2 7
Ends in 2 Days 8 Hours 4 Minutes 52 Seconds
Current price: $39.99 (0 bids)
COLLINS 51S-1 Receiver  Vintage RARE 51S1 Roun Emb
COLLINS 51S-1 Receiver Vintage RARE 51S1 Roun Emb
Ends in 2 Days 15 Hours 42 Minutes 53 Seconds
Current price: $2,388.00 (0 bids)
COLLINS 51S-1 RECEIVER  ROUND EMBLEM - DIAL LOCK -
COLLINS 51S-1 RECEIVER ROUND EMBLEM - DIAL LOCK -
Ends in 3 Days 34 Minutes 42 Seconds
Current price: $1,699.99 (0 bids)
COLLINS 51S-1 - CRYSTAL 9 MHz 9000 KHz - Y13 - p/n
COLLINS 51S-1 - CRYSTAL 9 MHz 9000 KHz - Y13 - p/n
Ends in 3 Days 22 Hours 57 Minutes 35 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 3 Days 23 Hours 5 Minutes 52 Seconds
Current price: $19.99 (0 bids)
COLLINS 51S-1 - CRYSTAL 14 MHz 14000 KHz - Y10 and
COLLINS 51S-1 - CRYSTAL 14 MHz 14000 KHz - Y10 and
Ends in 3 Days 23 Hours 22 Minutes 24 Seconds
Current price: $19.99 (0 bids)
COLLINS 51S-1 - CRYSTAL 12 MHz 12000 KHz - Y8 - p/
COLLINS 51S-1 - CRYSTAL 12 MHz 12000 KHz - Y8 - p/
Ends in 3 Days 23 Hours 34 Minutes 19 Seconds
Current price: $19.99 (0 bids)
COLLINS 51S-1 - CRYSTAL 16 MHz 16000 KHz - Y12 - p
COLLINS 51S-1 - CRYSTAL 16 MHz 16000 KHz - Y12 - p
Ends in 3 Days 23 Hours 43 Minutes 7 Seconds
Current price: $19.99 (0 bids)
COLLINS 51S-1 - CRYSTAL 9.500 MHz 9500 KHz - Y4 -
COLLINS 51S-1 - CRYSTAL 9.500 MHz 9500 KHz - Y4 -
Ends in 3 Days 23 Hours 52 Minutes 41 Seconds
Current price: $19.99 (0 bids)
COLLINS 51S-1 - CRYSTAL 11.000 MHz 11000 KHz - Y7
COLLINS 51S-1 - CRYSTAL 11.000 MHz 11000 KHz - Y7
Ends in 4 Days 19 Seconds
Current price: $19.99 (0 bids)
COLLINS 51S-1 - CRYSTAL 10.332.5 MHz 10332.50 KHz
COLLINS 51S-1 - CRYSTAL 10.332.5 MHz 10332.50 KHz
Ends in 4 Days 42 Minutes 57 Seconds
Current price: $27.99 (0 bids)
COLLINS 51S-1 - RF TUNING UNIT COVER TUNING TOOL H
COLLINS 51S-1 - RF TUNING UNIT COVER TUNING TOOL H
Ends in 4 Days 6 Hours 54 Minutes 39 Seconds
Current price: $31.99 (1 bid)
Collins 51S-1 spare tubes set
Collins 51S-1 spare tubes set
Ends in 5 Days 1 Hours 25 Minutes 36 Seconds
Current price: $59.95 (0 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 6 Hours 35 Minutes 37 Seconds
Current price: $14.99 (0 bids)
Collins 51S-1 Instruction manual - Premium Card St
Collins 51S-1 Instruction manual - Premium Card St
Ends in 5 Days 14 Hours 35 Minutes 45 Seconds
Current price: $29.95 (5 bids)
Collins 51S-1 manual with 13 foldout diagrams/sche
Collins 51S-1 manual with 13 foldout diagrams/sche
Ends in 6 Days 7 Hours 40 Minutes 51 Seconds
Current price: $23.95 (0 bids)
Wire Pro 86CP9 Amphenol 9 Pin octal style plug phe
Wire Pro 86CP9 Amphenol 9 Pin octal style plug phe
Ends in 7 Days 2 Hours 36 Minutes 22 Seconds
Current price: $12.50 (0 bids)
COLLINS 51S-1 RECEIVER  ROUND EMBLEM  DIAL LOCK  E
COLLINS 51S-1 RECEIVER ROUND EMBLEM DIAL LOCK E
Ends in 7 Days 4 Hours 3 Minutes 14 Seconds
Current price: $1,699.99 (0 bids)
COLLINS 51S-1 HF RECEIVER - DIAL WINDOW - COUNTER
COLLINS 51S-1 HF RECEIVER - DIAL WINDOW - COUNTER
Ends in 7 Days 8 Hours 35 Minutes 45 Seconds
Current price: $31.99 (0 bids)
COLLINS 51S-1 - AF GAIN - LINE AF GAIN - KNOB - p/
COLLINS 51S-1 - AF GAIN - LINE AF GAIN - KNOB - p/
Ends in 7 Days 8 Hours 49 Minutes 41 Seconds
Current price: $49.99 (0 bids)
COLLINS 51S-1 RECEIVER - ROUND EMBLEM  - DIAL LOCK
COLLINS 51S-1 RECEIVER - ROUND EMBLEM - DIAL LOCK
Ends in 8 Days 1 Hours 2 Minutes 5 Seconds
Current price: $1,614.99 (0 bids)
Collins 51S-1 NEW Chassis Mounted Replacement Capa
Collins 51S-1 NEW Chassis Mounted Replacement Capa
Ends in 9 Days 9 Hours 20 Minutes 1 Seconds
Current price: $43.99 (16 bids)
Collins 51S-1 NEW Capacitor Replacement Kit
Collins 51S-1 NEW Capacitor Replacement Kit
Ends in 11 Days 7 Hours 58 Minutes 36 Seconds
Current price: $59.99 (76 bids)
Collins 51S-1  Full Set of Inlays for Front Panel
Collins 51S-1 Full Set of Inlays for Front Panel
Ends in 11 Days 13 Hours 13 Minutes 50 Seconds
Current price: $7.99 (114 bids)
Collins 51S-1 Receiver WHITE Bartlett Meter face t
Collins 51S-1 Receiver WHITE Bartlett Meter face t
Ends in 13 Days 8 Hours 20 Minutes 24 Seconds
Current price: $27.99 (4 bids)
Collins 51S-1 Receiver WHITE Honeywell Meter face
Collins 51S-1 Receiver WHITE Honeywell Meter face
Ends in 13 Days 8 Hours 24 Minutes 44 Seconds
Current price: $27.99 (9 bids)
COLLINS 51S-1 - FREQUENCY COUNTER ASSEMBLY - p/n 0
COLLINS 51S-1 - FREQUENCY COUNTER ASSEMBLY - p/n 0
Ends in 14 Days 44 Minutes 14 Seconds
Current price: $79.99 (0 bids)
COLLINS 51S-1 - SHOCK MOUNT SHOCKMOUNT SHOCK ABSOR
COLLINS 51S-1 - SHOCK MOUNT SHOCKMOUNT SHOCK ABSOR
Ends in 14 Days 4 Hours 50 Minutes 48 Seconds
Current price: $9.99 (0 bids)
COLLINS 51S-1 Dial PLATE Surround Ham Tube Radio R
COLLINS 51S-1 Dial PLATE Surround Ham Tube Radio R
Ends in 15 Days 8 Hours 7 Minutes 27 Seconds
Current price: $34.95 (1 bid)
COLLINS 51S-1 VECTOR STAND-OFF TERMINAL BOARD 306-
COLLINS 51S-1 VECTOR STAND-OFF TERMINAL BOARD 306-
Ends in 17 Days 19 Hours 39 Minutes 46 Seconds
Current price: $39.99 (0 bids)
TUBE  KIT  FOR  COLLINS  51S-1
TUBE KIT FOR COLLINS 51S-1
Ends in 19 Days 2 Hours 46 Minutes 11 Seconds
Current price: $109.00 (5 bids)
COLLINS 51S-1 - SHOCKMOUNT BASE 350D-5 - collins p
COLLINS 51S-1 - SHOCKMOUNT BASE 350D-5 - collins p
Ends in 19 Days 22 Hours 44 Minutes 18 Seconds
Current price: $99.00 (0 bids)

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