HRWB 256 - Tube Gear with Grayson Evans KJ7UM

from Ham Radio Workbench Podcast · host Ham Radio Workbench Podcast

In this episode, Grayson Evans, KJ7UM, joins us again to talk about designing and building ham radio gear with tubes, or as he refers to them: thermatrons. Grayson is the author of Hollow-State Design, a book all about tube-type radio equipment. Grayson also provides basic tube radio kits. Grayson is a great mentor and shares his love for all things thermatron !

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This episode is 2 hours and 36 minutes long.

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This episode was published on February 10, 2026.

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