[Johnson] EFJ photographs posted by wa2cwa

[Robert Nickels]

According to an article in Electric Radio, Fred Hager was also 
responsible for the Viking Kilowatt aka "the Desk Kilowatt". What is a 
big transmitter to most hams must have been child's play for him after 
all of his work on high power matching networks.

The last photo on this page is quite interesting: 
https://www.historical.waseca.mn.us/collection/search/photos?q=viking

This is the "Thunderbolt II" which was intended to be the matching 
amplifier for the Avenger that never made it past the pre-production 
stage.  But if this amplifier looks familiar, it's probably because many 
hams know is as the Tempo 2000:

https://www.eham.net/reviews/view-product?id=8977

Even though Henry Radio had as much experience designing and building 
high-powered amplifiers as anyone, they opted to buy and re-sell this 
Johnson-made amplifier with the Tempo 2000 nameplate as Johnson was 
exiting the ham business.    According to published data, 897 original 
Thunderbolts were sold, no idea how many of the Thunderbolt II models 
were sold to Henry.

73, Bob W9RAN