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EF Johnson Viking 2 & Collins 75A2 Station
Currently located at WB6FZH's Northern California QTH
The Viking 2 is on the Left with the 122 VFO & Matchbox, the 75A2 on right
EF Johnson Viking 2 AM/CW Transmitter Technical Information
- Note: Information about the Viking 2/CDC is also included.
- Viking 2-Model 240-102-2 (102-1 Kit) Viking 2CDC-Model 240-102-16
- First Offered 1952 Viking 2 CDC 1954-60?
- Bands- 160-10 Meters (CDC 1.5-32.0 mhz Continious)
- Price- Viking 2- Wired/Tested $324-336.00 Viking 2 CDC $$398-430.00
- Mode/Power Input- AM 130 watts CW 180 watts
- CDC Model has 3 wire PTT, Modulation Limiter Circuit & Extended frequency Coverage
- Power Output- AM- 100W CW- 130W
- 6AU6 Crystal Oscillator
- 6AQ5 Buffer/Doubler
- 6146(2) RF Power Output Amplifier
- 6AU6 Speech Amplifier
- 6AU6 Audio Driver
- 807(2) AF Amplifier/Modulator
- 5R4GY(2) High Voltage Rectifier
- 5V4 Low Voltage Rectifier
- CDC Model- 6J6 Audio Limiter
- 6AQ5 Clamp Tube (Screen Voltage Regulator)
- Model 240-122-2 (Wired version 240-122-1)
- First Offered 1952
- 160-10 Meter Amateur Bands (Including 11 Meters)
- Power Supply- Not included, plugged into Viking 1, 2, Adventurer and other equipment.
- Power Requirements- 250-300 VDC at 15ma, 6.3 @ .3 amp (AC/DC)
- Tubes- 6AU6 VFO, OA2 Voltage Reguator (No Tubes with Kit)
- Price- Wired: $69.75 Kit: $42.75
- Output Frequencies- 1.8 mhz(160 & 80), 7 mhz(40-10) & 6 mhz on 11 meters
- Paint and Knobs to Match the EF Johnson "Viking" Series Equipment
Collins Model 75A2 Receiver Technical Information
- Double Conversion Superhetrodyne Receiver
- Covers 160-10 Meter Amateur Bands
- 9 tuned Circuits at 455 kc IF, plus an Improved Crystal Filter.
- Variable Crystal Filter on Front Panel
- 200 cps Notch with Phasing Control
- Lighted Slide Rule Dial for Band in Use
- Vernier Dial at 1 kc intervals (Except 10 & 11 Meters it is 2 kc)
- CW and AM detection (FM with 148C-1 NBFM plug-in adaptor)
- Controls- Off/Standby/On, RF Gain, AF Gain, Bandswitch, Antenna Trim, AM/CW/ACC, Limiter In/Out, Selectivity, BFO Frequency & Filter Phasing
- 2 Tube Collins 70E-12 PTO for extreme stability
- 15 Miniature Tubes and a Rectifier
- 6AK5 RF Amplifier
- 6BE6 HF Mixer
- 12AT7 Crystal Oscillator
- 6BE6 IF Mixer
- 6BA6 (2) VFO
- 6BA6 (3) IF Amplifiers
- 6AL5 AVC & Audio Detectors
- 6BA6 BF)
- 6AL5 CW Noise Limiter
- 6AQ5 Power Audio Amplifier
- 5Y3 Power Supply Rectifier
- 100 kc Crystal Calibrator Accesory (8R-1 Plugs into top of chassis)
- Power Source- 110 VAC 50/60 Cycles
- Shipping Weight- 70 pounds
- Dimensions- 21 1/8 Wide, 12 7/16 High, 13 5/16 Deep
- Receiver Price(1951)- $420.00 10" Speaker in Matching Cabinet- $20.00
- Accessory Pricing- 8R-1 100kc Calibrator- $25.00 148C-1 FM Unit- $22.50
- Manufacturer- Collins Radio Company, Cedar Rapids, Iowa
NOTE: This equipment is currently "On The Air". The Viking 2 recently had all the DC Filter Capacitors replaced along with the Audio Coupling Capacitors. It is in Fair to Good Cosmetic Shape but Very Good Electrical Condition. It is regulary used on 75 Meter AM Activities.
The 75A2 was aligned several years ago and seems to be working fine. It has a "Homebrew" plug-in Crystal Calibrator, and "Aftermarket" Product Detector Plug-in in the NBFM socket.
The Speaker Shown is Counterfeit! It is a National Speaker painted St. James Grey and has a Collins Emblem from another radio set. It is actually made from an old National Radio Company Speaker.
The E.F. Johnson Company 275 Watt "Matchbox" is shown on top of the Viking 2. It is an 80-10 meter Antenna Tuner. The Heathkit AM-2 SWR Bridge is connected to it and the transmitter.
The Microphone is a 1960s Ceramic PTT Desk Microphone. The headphones are the R-10 type from WW2. There is a replica 1030s ARRL Logbook on the benchtop.
More Technical Information about this radio will be posted soon.
Last Updated: September 5, 1998
