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I actually killed noticable distortion by reducing the input source volume. The signal is not as loud as before, but sounds okay assisde from some buzz (likely from the power supply). I was overdriving the poor thing with the audio signal before.
The amplitude is not modulated in the way I'd have immagined it. Instead of max audio corresponding with max RF, max audio corresponds with min RF.
Reece, I gota agree with you that this is plenty fun.
Bob, I was considering using my other NOS subminiture tube in conjunction with the one i'm using as an osc. in a couple of different arrangements for better modulation. I first tried the easiest thing which was to try to imitate the single tube modulator scheme that the designs on phill's site used. And if I can make my single tube design work a bit better I may possibly keep it limited to one tube as I really want to keep my other subminiture unused as a display item.
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