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Johnson Valiant Audio Modifications – W8JI Website
https://new.w8ji.com/johnson-valiant-audio-modifications/
Johnson Valiant Audio Modifications Amplitude Modulation Heising Modulation. After extensive search, review, and testing, ... I wound up doing minimal modifications to my Valiant. I found many mods did nothing, and a few that actually hurt performance. I added negative feedback from the secondary of the modulation transformer to the cathode of ...
Johnson Valiant Audio Modifications
https://www.w8ji.com/johnson_valiant_audio.htm
Johnson Valiant Audio Modifications. Amplitude Modulation Heising Modulation. After extensive search, review, and testing, I wound up doing minimal modifications to my Valiant. I found many mods did nothing, and a few that actually hurt performance. I added negative feedback from the secondary of the modulation transformer to the cathode of the ...
Johnson Viking Valiant Modifications - Murray State University
http://campus.murraystate.edu/org/msuarc/valiantmods.htm
Johnson Viking Valiant Modifications. 1. Replace All of the filter caps. Use higher values, Bigger is better. 2. Remove C54, C55 and C56 on the accessory plug. (Better Highs) 3. Change the Plate Choke Bypass Caps to 0.001 2KV RF types.
Audio Mod Ranger Valiant
https://www.w8ji.com/Johnson%20audio%20mods.htm
Johnson Ranger and Valiant transmitters had the best audio on 160 meters. Johnson engineers did a good of sizing components. They obviously intended the audio system to roll off lows and accent highs to give the signal more "punch". Johnson designers did not get carried away with accenting highs as badly as Heathkit did in the Apache, DX-100, and other rigs.
Johnson Valiant Modifications - Wireless Girl
http://wireless-girl.com/Projects/AMTransmitters/JohnsonValiant3.html
The three 6146s in the RF stage are to be standard 6146s, not 6146B. These are reserved for the modulator, as detailed in the first article explaining why the Valiant strains to obtain sufficient audio power to fully modulate the RF stage. How Johnson missed the correct biasing of the RF finals is beyond me.
Valiant Mods - Amfone
http://amfone.net/ECSound/Valntmods1.htm
Valiant Mods. Johnson Viking Valiant Audio Mods. & Stuff Posted by Keith, WA1H. Call 603-548-0125 anytime to talk about your Johnson! Here is the audio section schematic for the Viking Valiant Audio Mods. I have a few versions of the schematic. You may want to …
E. F. JOHNSON VALIANT MODIFICATIONS BY WA1HLR, WITH ...
http://www.wirelessgirl.net/Projects/AMTransmitters/JohnsonValiant5.html
IF you want to keep the original wiring of the Valiant (while implementing the Johnson Valiant Modifications by WA1HLR), that is a SINGLE ENDED DRIVER. The two sections of the 12AU7 or 12BH7 are connected in PARALLEL for more plate dissipation and lower output impedance. This configuration should use the Hammond 124B or P-T156 transformer.
Audio Mod Ranger Valiant – W8JI Website
https://new.w8ji.com/audio-modranger-valiant/
Valiant Audio Mods Johnson Valiant The Ranger and Valiant Audio System When I was first getting into amateur radio in Toledo, around 1960, I mostly listened to 160 meters. I was awestruck at how powerful and clear Ranger and Valiant transmitters sounded. Johnson Ranger and Valiant transmitters had the best audio on 160 meters. Johnson
The AM Window: Tech: Mods: Valiant
http://amwindow.org/tech/htm/valiantbytron.htm
The AM Window: Tech: Mods: Valiant. T he modifications below are what I call Level One Mods. These will improve the audio and overall efficiency of the Valiant transmitter. Set up is for D 10-4 or other high impedance peizoelectric microphonium. EF Johnson produced the Valiant in mass quantities. It seemed impressive with three 6146s in the PA stage, a pair in the modulator and a …
N2FFL...Johnson Viking Valiant
https://www.qsl.net/n2ffl/VikingValiant.html
The audio section is much hotter now, has better audio quality and the rig has better modulation. The WA1HYellR Valiant mods are now available on The AM Window site here . I was running a stock, unamplified D-104 with the Valiant but have modified the D-104 and installed a Radio Shack condenser mic in the head which, in my opinion sounds better than the D-104 element.
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