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In Reply to: RE: single ended OTL? posted by Banat on December 26, 2015 at 06:55:39
Your explanation was perfect.
When I read about SET OTL's, I scratch my head. By their very nature, A-S OTL's are a type of SET.
I remember once asking another manufacturer 'your SET amplifier has an XLR, but is it a true balanced circuit?'. 'No', was the response, 'it would be too expensive to build. It would need another amplifier built in, and another output transformer'.
The single ended OTL by transcendent sound is no longer made Each channel had a driver tube and 4 output tubes in Parallel. 1-1/2 watts per channel. You can do a search for single ended OTL and see a lot of info about this amp
David Berning makes an SE OTL, called the "Seigfried". I think it utilizes his ZOtl technology, but I am not sure.
I have the Atma-Sphere MA-1 set up. 140 watts.
I have the Tenor WP75 waiting for another chance. 75 watts.
If the Transcendent was 1.5 watts, with 4 output tubes, then SET's are most often low powered.
The obvious exceptions being the 211, 845, 1605 etc tubes.
I believe I'm starting to understand.
by paralleling more and more output tubes, but inevitable mismatching among the output tubes and additional requirements of power handling in the output transformer, are said to result in a deterioration and loss of SE "magic", such as it is. 100W would be about the practical limit, though. Those Kron amplifiers from Europe were an interesting attempt at high power SET. SE amplifiers are best mated with very high efficiency, and high input impedance, speakers, such that low power output is more than adequate. Real aficionados seem to feel that the lower the power output, the better the amplifier will sound.
Have you auditioned those Tenor amplifiers? I am curious to hear them some time.
You are right ! , since my experience with DIY SET amps are that 10W max is top optimum limit , SET with more output power than 10W cause SET magic to gone ,
and of course that those low power SET amps have to be very carefully matched with very high-efficiency LS for best sonic results ,
IMHO the best SET amps are those simple two stage based ,RC coupled ,
any way , except hyper liquid treble sound which come from typical SET amp I was never impressed or big fun of that sort of amps , there is so many things that miss for me , special at reproduction of lower bass range same as at highest sonic range ,
Best Regards !
General Warning , I have no intention to start OTL vs SET war with nobody !
"Art which does not have the appearance of art is true art."
- Old Roman saying -
Tenors claim to fame was 'Harmonic Structural Integrity'.
To that end they succeeded.
However, the Atma-Sphere's do most of the other stuff better.
Once my new speakers are complete, I'll try the Tenor's again.
My second hand information leads me to believe the Tenors used voltage regulation on the output stage, unlike most tube amplifiers, let alone Atma-sphere amplifiers. And they use a 12AX7 for voltage gain at the input, instead of a cascode a la Atma-sphere. And they are not dual-differential at the input, I don't think. But it's dangerous to assume from design or specs that one can therefore judge the amplifier. It may be excellent and does have its adherents.
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