Download GIF and PDF diagrams here for the modification of power amplifier stages from Sweep tubes to 6146es.

From The AM Window folks. Excellent source of information.

Tim Smith, WA1HLR shows his audio improvements for this rig.

Improvements made to a boatanchor classic.

Yaesu-Musen Company FT-101 series audio modifications for improving fidelity on the air.

WA3REY presents a number of transmit and receive mods.

How to make vast improvements in the typical "All American Five" tube receiver.

6146 conversion kit for the Drake T4X (instead of two 6JB6 finals). He also offers other kits and repair tips for radios and amplifiers.

Files of mods arranged by brand and model, plus a few Heath.

Articles on modifying the Motorola Mitrek for the ham bands.

W8TOW describes in detail how to improve the audio on the Johnson Viking Valiant transmitter.

Soup up your Johnson.

Information, pictures and schematics. History of the All-American 5. Includes modifications, and sub-miniature tube info.