Vintage Johnson Viking II CDC Civil Defense Transmitter High voltage power troubleshooting Part 3

Part 3. In this video, I will be testing the transmitter for HV and RF output. Before I could safely apply HV, I had to repair a damaged rectifier socket, change the main HV filter cap, plus the 807 .5uf screen cap. Then I made sure to disconnect the 350vdc line to the audio preamp section. I did not want a possible short to influence the testing. The failed rectifier socket is due to terminal proximity to chassis and contamination. Solution, make Insulators to stop arcing on high voltage rectifier tubes. I have installed these little homebrew spacers on many transmitters with great success. This fault is not common with clean well kept equipment. Contamination is usually the catalyst. Note: I used a Greenlee punch to make the nice round cutout. Initially the transmitters output was low, I thought maybe the HV was low, but tested and no it was fine. Got the bright idea to check the clamper tube adjustment. Full power was obtained! I will be properly adjusting the clamper circuit when final adjustments are ready to be performed. Part 4 will consist of updating the PTT circuit and rebuilding the audio preamp/driver. The project is coming along nicely. For more of D-lab see: d-labelectronics.com or   / dlab_electronics