@Glen....Gudoldaze and Round Tuits....now you've got me reminiscing. I built a colour organ from a Practical Electronics article. It had 3 9V-240V transformers with the 9V windings across the speaker outputs and the 240V windings driving SCRs which drove the lights. One 240V winding had a cap across it, and one a cap in series to do the frequency selection. It had a 20R pot in series with the speaker connection as an intensity control. Hideously crude, but it worked. I hate to think what it did to the speaker impedance presented to the amp.....and I think it needed a couple of watts to drive it. I had it in my junk store, meaning to redesign it, for years but got rid of it when I left ZImbabwe. Probably just as well, I certainly don't have time now....
Never had a color organ, instead used a defunct small TV (with CRT still working) with an additional yoke (deflection coil assembly) driven from a pair of 6L6 in pushpull, the vertical winding through a few tens of uF for bass phase shift. The resulting Lissajous figures, when projected onto a wall through a 4" magnifying glass, were truly mesmerizing. The harmonics of Black Sabbath created some really interesting Lissajous figures with curls in the corners of rectangles; my buddies would sit transfixed for hours staring at the pulsating patterns projected onto the wall. Always wanted to do the same thing with a color TV, but never got a round tuit.
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