Has anyone satisfactorally done this ? How cleanly can it be done ?
I once worked a guy who had opened the screen supply and placed the high-Z side of an 8 ohm to 10 kilohm audio transformer in series with it. (I think it was a 10-Watt tube audio amp output transformer wired up backwards.) He then connected a small hi-fi amp's speaker output to the 8 ohm side -- and the resulting AM sounded superb. I believe he may have reduced the bypass capacitance on the screens somewhat, but it's been a few years so no numbers come to mind. I am not sure what adjustments had to made as far as drive, loading, and screen voltage were, though.
73,
Kevin, WB4AIO.