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In Reply to: RE: Agree I'd add-- posted by Des on April 12, 2019 at 18:21:47
I was hooked years ago and haven't been without since.
Follow Ups:
Will admit, I'm not really up to speed on the details of OTLs, but the NYAL/Julius Futterman amps were big back in the day..
Otherwise? Surely VERY significant, but will little recognition? How about the David Berning amps like the ZH-270? I've heard that little bastard power everything from a home built 2-way to a SoundLab electrostat & sound great doing it!
-Did a pretty good job of convincing the public that OTLs blow up. No debate, unlike solid state/tubes or analog/digital.
Atma-Sphere made the world's first reliable OTLs; impervious to oscillation on any load. Nowadays people are much more likely to accept that an OTL will work. But it took 25 years to get there.
Have had my H3A since 1987 and it has been utterly reliable. Several friends that have owned the original Futtermans also have had trouble free service over a mult-year period.
-with an easy load, and don't overload them, they can be well behaved.
But put them on an inappropriate load and especially if you clip the amp hard and bad things can happen.
The worst OTL amp was from a St. Louis company (can't remember the name, maybe you can Ralph). I owned the Triomphe model. The front-end voltage regulator was always burning up. LoL
It wasn't the Triomphe model though. They used a filter capacitor in their power supply marked 'Bindu' which was a really suspect name to find on a filter capacitor; to make matters worse they ran it at about 30 volts over the rated voltage!
Not surprisingly they had a way of blowing off the circuit board... I was lucky; the part missed me and embedded itself in the false ceiling above me and left a mess everywhere. My ears rang for 10 minutes.
I don't blame this on Futterman though; Futterman knew enough to not do something stupid like that. It was just poor engineering. IMO Fourier products cannot be ethically repaired as there is no way to warrant that they will keep working.
Thanks. I believe you were referring to their use of 'photo flash' caps. No pics included, LoL. :)
Usually those are marked. I know New York Audio Labs used photoflash caps in their stuff. They were clearly marked 'photoflash' as every other photoflash cap I've seen. These were not- although its obvious they were sketchy; they could well have been since they had a lot of 'capacity' for their size.
Agreed. They figured out the OTL mystery better than anybody.
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