E.F. Johnson Invader

    E.F. Johnson Invader - front viewE.F. Johnson Invader - Front view (courtesy of W3RXO)
Type
Desktop Amateur HF Transmitter 
Frequency range RX
TX
80-10 m 
Frequency stability
Tuning steps
Filters
Receiver
Modulations
Sensitivity
Selectivity
Receiver system
IF-frequencies
Image rejection
Audio output
Transmitter
Modulations
AM / CW / SSB 
RF-output
AM: 50 W, SSB/CW: 100 W 
Connections
Antenna
Impedance
Electrical
Power requirements
Mains (internal PSU) 
Current drain RX
TX
Physical
Dimensions (w×h×d)
292 × 530 × 445 mm (11.50 × 20.87 × 17.52 in)  
Weight
25 kg (55.2 lbs)  
Form factor
Desktop 
Manufactured
Between 1960 and 1963 in USA 
Other features
Memories
Usage
Amateur / Ham radio operators 
Manufacturer
E.F. Johnson 
Model
Invader
Features
VFO
Internal power supply
Final Tube(s): 2ea. 6146 parallel
SSB Method: Crystal Filter (9 MHz) 
Manuals, Diagrams and Brochures
 
None available  

Price History

Estimating the value of a rig, especially an old one, can be challenging. The graph below displays what others have paid for this rig over the years. May it guide you to good fortune...

Reviews

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Reviewed by
ac0rl
Review date
Dec 6th 2013, 20:45
Purchased
Used in 2013
  550.00
Performance
5 of 5
Build quality
5 of 5
Features
4 of 5
User friendliness
3 of 5
Value for money
5 of 5

Awesome Transmitter

After repair and alignment of my invader, it has turned out to be very stable and earns many compliments when on the air. Audio quality and power output is fantastic. Very well built and designed to last.

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Reviewed by
dgalligan60
Review date
Jun 10th 2012, 21:33
Purchased
Used in 2012
  550.00
Performance
4 of 5
Build quality
5 of 5
Features
3 of 5
User friendliness
3 of 5
Value for money
4 of 5

Classic Boat Anchor

Often overlooked, in favor of the older AM/CW transmitters, this is one of the last classic Boat Anchors, and in my opinion, one of the best. It, and it's big brother, the 2K, are the last of the BIG, Johnson Boat Anchors, and are all too often overlooked, by boat anchor collectors. Personally, I prefer the transmitters that also give you SSB, built-in, like this one, the KWS-1, and the Heath Marauder. It just makes them more versatile. While they might not be optimal radios for working SSB, they get the job done, and do it well. Beside, the receiver is the more important part of the set up.

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