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HRWB 256 - Tube Gear with Grayson Evans KJ7UM

Ham Radio Workbench Podcast by HamRadio Workbench

Feb 10, 202602:36:07Technology

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 t...

About This Episode

HRWB 256 - Tube Gear with Grayson Evans KJ7UM is an episode from Ham Radio Workbench Podcast by HamRadio Workbench. In this episode, Grayson Evans, KJ7UM, joins us again to talk about designing and building ham radio gear with tubes, or as...

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This episode belongs to Ham Radio Workbench Podcast.

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Episode Details

Published Feb 10, 2026, 02:36:07 long, audio available.

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Questions About This Episode

What is HRWB 256 - Tube Gear with Grayson Evans KJ7UM about?

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 !

Where can I listen to HRWB 256 - Tube Gear with Grayson Evans KJ7UM?

You can listen to HRWB 256 - Tube Gear with Grayson Evans KJ7UM online on Radio and Podcast. Open the player on this page to stream the available audio.

Which podcast is HRWB 256 - Tube Gear with Grayson Evans KJ7UM from?

HRWB 256 - Tube Gear with Grayson Evans KJ7UM is an episode from Ham Radio Workbench Podcast by HamRadio Workbench.

How long is this episode?

This episode is 02:36:07 long.

When was this episode published?

This episode was published on Feb 10, 2026.

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Are there related episodes from Ham Radio Workbench Podcast?

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