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#2
December 4th 13, 03:35 AM
posted to rec.radio.amateur.boatanchors,sci.electronics.design
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Toob Amplified PC Speakers
On Mon, 2 Dec 2013, Robert Baer wrote:
Maynard A. Philbrook Jr. wrote: In , says... Jim Thompson wrote: On Mon, 02 Dec 2013 12:58:56 -0600, Tim Wescott wrote: It's winter, and the amplifier in my PC speakers just died. I think it'd be kinda cool to have a toob speaker amp, but I'm too lazy (and time-challenged) to build one up from scratch. Are there, by any chance, kits out there? I'm not looking for nickel- cored transformers with solid silver windings, genuine paper caps rolled on the thighs of virgins, toobs dipped in LN2, and all that crap: I'm just looking for something that'll give the audio quality of a mid-range amplified speaker set, in a cabinet that shows off the fact that it all uses ancient technology to get the job done. Suggestions welcome. TIA Just for fun, you might do a single stage class-A stage using a 2A3. I did one when I was a kid, but with 5 in parallel ;-) ...Jim Thompson Better yet, a push-pull transformerless design! I remember a quasie tube output, that was bad car ma. It required a safety circuit on the output, not for users but for equipment. The outfit could care less about the user safety!  This was a magnetic server that required a broad range of bw. the tube outputs were a pair of 4-400Z. Had dual HV supply because you needed the - rail for the bottom side. each heater had their own transformer with CT to tie off to the common for pinch off biasing. The top side had some strange method of driving the tube, but it worked Jamie I may still have circuits and/or designs of transformerless tube speaker drivers that were purported to be perfectly safe to touch active lines (do not ask which lines, do not remember). And yes, the circuitry is weird on the push-pull drivers; there was even a full bridge version. Make the speakers electrostatic, and then drive them from the "plates" of high voltage mosfets. Wont' be so good for the low frequencies, but then a lot of computer speakers arent' good down there anyway, the "subwoofers" not being useful for the actual frequencies where subwoofers kick in. Michael |
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