Collins 75A

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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 75A EBay Bargains!

OEM COLLINS 75A4 RECEIVER  KWS1 TRANSMITTER 4:1 KN
OEM COLLINS 75A4 RECEIVER KWS1 TRANSMITTER 4:1 KN
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6L7 Sylvania USA Tube NOS CV1951 Heptode Collins 7
6L7 Sylvania USA Tube NOS CV1951 Heptode Collins 7
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Collins 75A-4 Dave Curry Filter: .500 KC CW, 2.5 K
Collins 75A-4 Dave Curry Filter: .500 KC CW, 2.5 K
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Collins 75A4 main tuning knob (PTO) replacement. R
Collins 75A4 main tuning knob (PTO) replacement. R
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Collins 75A-4 Complete Tube Set—New
Collins 75A-4 Complete Tube Set—New
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1956 Print Ad of Walter Ashe Radio Co Collins 75A-
1956 Print Ad of Walter Ashe Radio Co Collins 75A-
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SON WCC-LC-6 VINTAGE 6FT AC POWER CABLE CORD BLACK
SON WCC-LC-6 VINTAGE 6FT AC POWER CABLE CORD BLACK
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Manual For Collins 75A-1 Amateur Receiver, Early
Manual For Collins 75A-1 Amateur Receiver, Early
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TUBE  KIT  FOR  COLLINS  75A4
TUBE KIT FOR COLLINS 75A4
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COLLINS  75A-1  TUBE  KIT
COLLINS 75A-1 TUBE KIT
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TUBE  KIT  FOR  COLLINS  75A2
TUBE KIT FOR COLLINS 75A2
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TUBE  KIT  FOR  COLLINS  75A3
TUBE KIT FOR COLLINS 75A3
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Nice HQ Copy Collins 75A-4 HAM Radio Receiver Owne
Nice HQ Copy Collins 75A-4 HAM Radio Receiver Owne
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Reprint Radio Manual Collins 75A-1 Receiver Lot47
Reprint Radio Manual Collins 75A-1 Receiver Lot47
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Collins 75A-4 Instruction Manual: 11’ X 23&r
Collins 75A-4 Instruction Manual: 11’ X 23&r
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Collins 75A-2 Instruction Manual: 11’ X 20&r
Collins 75A-2 Instruction Manual: 11’ X 20&r
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Collins 75A-3 Instruction Manual - Premium Card St
Collins 75A-3 Instruction Manual - Premium Card St
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Collins 75A-1 Instruction Manual - Premium Card St
Collins 75A-1 Instruction Manual - Premium Card St
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Collins 75A-1 manual w/foldout schematic »R²
Collins 75A-1 manual w/foldout schematic »R²
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Collins 75A-2 manual (early) w/23’ schematic
Collins 75A-2 manual (early) w/23’ schematic
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Collins 75A-2 manual (late) w/19’ foldout sc
Collins 75A-2 manual (late) w/19’ foldout sc
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Collins 75A-3 manual w/19’ foldout schematic
Collins 75A-3 manual w/19’ foldout schematic
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Collins 75A-4 manual w/ service bulletins plus+++
Collins 75A-4 manual w/ service bulletins plus+++
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Manual For Collins 75A-3 Amateur Receiver, Early
Manual For Collins 75A-3 Amateur Receiver, Early
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GC 1400W CHICAGO DAKAWARE 11/16’ ROUND POINT
GC 1400W CHICAGO DAKAWARE 11/16’ ROUND POINT
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Manual For Collins 75A-2 Amateur Receiver, Early
Manual For Collins 75A-2 Amateur Receiver, Early
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Manual For Collins 75A-4 Amateur Receiver, Early
Manual For Collins 75A-4 Amateur Receiver, Early
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Collins 75A-2, 75A-3  NEW Chassis Mounted Replacem
Collins 75A-2, 75A-3 NEW Chassis Mounted Replacem
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SSB Adapter for Collins 75A-2 and 75A-3 Receivers
SSB Adapter for Collins 75A-2 and 75A-3 Receivers
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GC 4107 CHICAGO DAKAWARE 1-3/8’ SKIRTED FLUT
GC 4107 CHICAGO DAKAWARE 1-3/8’ SKIRTED FLUT
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GC 1450 CHICAGO DAKA-WARE 11/16’ ROUND RADIO
GC 1450 CHICAGO DAKA-WARE 11/16’ ROUND RADIO
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MC 8/32 3/16’ KNOB SET SCREW 20PC FOR COLLIN
MC 8/32 3/16’ KNOB SET SCREW 20PC FOR COLLIN
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Collins 75A-2 NEW Capacitor Replacement Kit
Collins 75A-2 NEW Capacitor Replacement Kit
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Collins 75A-4 NEW  26 Piece Capacitor Replacement
Collins 75A-4 NEW 26 Piece Capacitor Replacement
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Collins 75A-2 & 75A-3 Frequency Drum Overlay
Collins 75A-2 & 75A-3 Frequency Drum Overlay
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Collins 75A-4 Frequency Drum Overlay 15m  20.5-21.
Collins 75A-4 Frequency Drum Overlay 15m 20.5-21.
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Collins 75A-4 Frequency Drum Overlay 15m  20.8-21.
Collins 75A-4 Frequency Drum Overlay 15m 20.8-21.
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Collins 75A-3 Amateur Receiver Manual HAM RADIO
Collins 75A-3 Amateur Receiver Manual HAM RADIO
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CEA-LCD-6 Black Vintage Non-polarized AC Cord Fits
CEA-LCD-6 Black Vintage Non-polarized AC Cord Fits
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Collins 75A-4, 4:1 Spinner Knob Reproduction NICE!
Collins 75A-4, 4:1 Spinner Knob Reproduction NICE!
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