FT-101 Mods
- Yaesu-Musen Company FT-101 series audio modifications for improving fidelity on the air.
- http://www.amwindow.org/tech/htm/ft101.htm

Eico 730 Modulator
- Improvements made to a boatanchor classic.
- http://www.amwindow.org/tech/htm/eico730.htm

Viking I and II Audio Mods
- Soup up your Johnson.
- http://amwindow.org/tech/htm/viking2.htm

E.F. Johnson Co. Ranger Mods
- Tim Smith, WA1HLR shows his audio improvements for this rig.
- http://amwindow.org/tech/htm/rangtron.htm

AM Rig Modifications
- From The AM Window folks. Excellent source of information.
- http://amwindow.org/tech/htm/mods.htm

6146 Diagrams FTP
- Download GIF and PDF diagrams here for the modification of power amplifier stages from Sweep tubes to 6146es.
- ftp://bama.sbc.edu/downloads/drake/6146conv/

Radio Modification files
- Files of mods arranged by brand and model, plus a few Heath.
- http://www.qrz.com/download/main/mods.html

K5DKZ
- 6146 conversion kit for the Drake T4X (instead of two 6JB6 finals). He also offers other kits and repair tips for radios and amplifiers.
- http://www.qsl.net/k5dkz/