I love to build high voltage - high power transmitters. Grounded Grid (GG) amplifiers for SSB amplification is very common and run class-B and are classified as linear amplifiers. These linear amplifiers can be used to amplify an AM signal and they can sound good. Their efficiency is low and even very large (1500+ watt PEP) GG amplifiers can usually not provide more than 300 watts output. Of course, that should be enough but sometimes we want more. I have built several other AM transmitters over the last 60 years I have been an amateur radio operator but I just can't get enough of it, it seems... I already had the 3-400Z amplifier in this video built and was using it occasionally for SSB but though I would "repurpose" it and plate modulate it for 40 and 20M AM. It is quite a chore to tame a powerful modulator producing better than 6000 volt peaks required to modulate an RF amplifier running 3200 volts at the anode. Anyway.. after a number of issues and a lot of research and trial-and-error (empirical design, so-to-speak), the project turned out good and now I have a somewhat novel transmitter running class-C, high-level plate modulated using a GG amplifier. Here is a link to an Eimac publication discussing GG amplifiers running class-C.
Stay Safe 73 WA4QGA
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