Equipment Modifications R-390A Audio Johnson Ranger (Simple) Johnson Ranger by The TimTron Johnson Viking I and II Another Viking I and II Mod Eico 730 Modulator by Steve, WB3HUZ Collins 32V Globe Scout 680 Heathkit DX-60 T-368 by the TimTron Hammarlund SP-600 BC-610 by N3EYR Screen Modulation Optimization for the DX-100 by Dean, WA1KNX Drive Pot Repair for the DX-100 FT-101 Audio Mods DX-100 ...
amwindow.org/tech/htm/mods.htm
The Competition Class Stock Eliminator Ranger by Timothy M. Smith WA1HnyLR, The TimTron See the Modified Modulator Schematic See the New PTT Schematic WELL, WELL, WELL! Its about time I sat down and did up an article on total dehyellification and other related modifications to the Johnson Ranger transmitter. Before one intends to modify this rig one must read and understand this article as well ...
amwindow.org/tech/htm/rangtron.htm
FT-101 Audio Modifications by Bob - N1UJS These mods worked beautifully on my FT-101E. They came to me from Eric, WB2CAU, who got them from Mark, WA1FAF who got them from the Master himself WA1HLR. Seventy-three and I hope these are a help to many. Transmit Modifications PB-1315: Change R2 from 47k to 4.7 M for crystal mic (D-104, etc.) Add 100 pF in parallel with R2 to bypass RF. Change C2 from ...
www.amwindow.org/tech/htm/ft101.htm
Amateur Radio Site, Personal homepage, Homepage of K5DKZ, Homepage of k5dkz ...
Audio Modifications for the Eico 730 Modulator by Steve - WB3HUZ Assuming you have a schematic, the mods are as follows, in order of importance. That is, if you only want to do one change, do #1. If you want to do two changes, do numbers 1 and 2. And so on.... 1. Bypass the clipper filter stage. Break the circuit on the cold side of C3 and the output side of L1. Then connect the cold side of C3 ...
www.amwindow.org/tech/htm/eico730.htm
From the AM Press Exchange, October 1981 Audio Conversion for Johnson Viking I and II Transmitters Shown above is a schematic that gives you improved gain and audio quality. Remove the two 6AU6 audio tubes and the associated circuitry. Remove the first 7 pin socket (1st audio stage). Punch a hole for a nine pin socket. The second 7 pin socket remains, as the 6C4 is a 7 pin tube. Rewire the first ...
amwindow.org/tech/htm/viking2.htm
