EF Johnson RF Tube Linears johnson-tube-linears@groups.io

This group supports older vintage tube RF linear amplifiers made by EF Johnson.
Restoration, modifications, upgrades and repairs and spare parts are discussed.
Models covered are the Desk Kilowatt, Viking Thunderbolt, 6N2 Thunderbolt , Viking courier and others.


Group owner is Steve KA2PTE who owns a Modified Viking Thunderbolt.

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  • 23 Members
  • 18 Topics, Last Post:
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Top Hashtags [See All]

  • #VIKING_THUNDERBOLT Johnson Viking Thunderbolt topics 8 topics
  • #PARTS Parts for sale , parts wanted or parts questions such as research, replacements or substitutions 2 topics
  • #4-400A_TUBES Topics more focused on the specs of the 400A tubes, biasing, power ratings and cooling. 1 topics

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