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Johnson Viking Valiant Modifications - Murray State University
http://campus.murraystate.edu/org/msuarc/valiantmods.htm
MSUARC - Valiant modifications 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 …
Valiant Mods - Amfone
http://amfone.net/ECSound/Valntmods1.htm
Johnson Viking Valiant Audio Mods. 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. your format. These have been done & redone over the years by myself - WA1HZK, Tim-WA1HLR, Chuck - K1KW , Brent - W1IA & Mike - N1IW
E.F. Johnson Viking Valiant - AM Window
http://amwindow.org/tech/htm/valiantbytron.htm
Here are the audio mods. 1. Change R-25 (1Meg) to 10-22 meg ohm (first stage grid resistor) 2. Reverse places in circuit for R26 (47k plate resistor) with R53 (220) decoupling resistor. R26 becomes 220K and R 53 becomes 47k. 3. Add a 10-40 uF/450 volt electrolytic in parallel with C 76 (0.1 uF decoupling cap) 4.
Johnson Valiant Modifications - Wireless Girl
http://wireless-girl.com/Projects/AMTransmitters/JohnsonValiant3.html
The P-T156 works well, and only costs $16. If your Ranger, Viking II, Valiant, or other Johnson Transmitter burns out an audio interstage transformer, this is the replacement that works perfect and fits the original bolt hole pattern. It also would be perfect for a DX100 or Heathkit Apache.
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
E. F. JOHNSON VALIANT MODIFICATIONS BY WA1HLR, WITH ...
http://www.wirelessgirl.net/Projects/AMTransmitters/JohnsonValiant5.html
UPDATE 1/14/2017: "Use correct 124B or P-T156 Hammond transformer in Johnson Viking Valiant Mods by WA1HLR". There is a lot of confusion resulting from the choice of whether to keep the original Valiant audio configuration (single ended driver stage) with minor mods (W8JI and WA1HLR) or using the extensive mods PUSH PULL DRIVER STAGE contained on my site.
High Fidelity Transformer Modification for Johnson Viking
http://motormouthmaul.com/linked/high%20fidelity%20transformer%20modification%20for%20johnson%20viking.pdf
High Fidelity Transformer Modification for Johnson Viking Valiant (The Central Coast Sound Made Simple) Overview: This procedure documents the method to insert a high fidelity audio transformer in the Valiant, bypassing all of the low level audio and clipping stages. This
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 Design - Wireless Girl
https://wireless-girl.com/Projects/AMTransmitters/JohnsonValiant1.html
I recommend you do ALL of the Johnson Valiant Modifications by WA1HLR FIRST; THEN replace the Johnson Valiant Driver Transformer with the P-T156 or Hammond 124B. This will take you a LONG way. My full replacement with a push pull audio driver circuit is a huge job, and will make smaller but significant improvements, should you care to go to all the extra work, as a "level 2 …
N2FFL...Johnson Viking Valiant - QSL.net
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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