Bottlehead Kits > S.E.X. Kit
S.E.X. 2.1 Retired!
tdogzthmn:
--- Quote from: Doc B. on May 07, 2016, 09:34:11 AM ---My thought is that it might be pretty cool if you had 600 ohm speakers. For 8 ohm speakers, what I would do would not be very practical.
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I've built and enjoyed the Crack a few years ago with my 600 ohm AKG's but I also know there are some manufacturers that make OTL Tube amps designed to work with speakers. I can't comment about the efficiency differences between designs (OTL vs SET), I just know it has been done before. Mostly I was wondering if it was something you had explored previously and abandoned?
Paul Joppa:
I have considered how to do that periodically, and always came back to the same point - it's just not practical without using a push-pull topology with lots of feedback.
Example: if the Crack works well into 600 ohms, then 75 paralleled cracks should work equally well into 8 ohms. But it's still a cathode follower, which means there is still some negative feedback sound. And it would consume 2 to 3 kilowatts, producing maybe 20 watts.
That's a crude analysis, and could probably be improved - but not dramatically.
Jim R.:
I have always found it interesting that an awful lot of people with OTL speaker amps use impedance matching autoformers with their amps. If you have as warped a sense of humor as I do, you'll see the supreme irony in this :-).
Brent:
Jim,
I have observed the same with some amusement. It's like the ingredients list on a slim Jim, which includes both 'defatted beef' and 'beef fat.' It's just weird. But whatever floats your boat. I'm sure I do plenty of things other people think is pointless or wrong. :)
Brent
Paul Birkeland:
--- Quote from: Jim R. on May 08, 2016, 04:55:02 AM ---I have always found it interesting that an awful lot of people with OTL speaker amps use impedance matching autoformers with their amps. If you have as warped a sense of humor as I do, you'll see the supreme irony in this :-).
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Yeah, god forbid that you tell that they no longer have an OTL amp, you'll cause a miniature meltdown on whatever forum you happen to be on.
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