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In Reply to: RE: You have arrived where I was about 25-30 years ago. posted by morricab on September 25, 2015 at 06:12:27
-There seems to be less incentive to go single-ended.
OTLs of course have their own issues often opposite of that of SETs. Instead of the bigger SET with full bandwidth being a sort of holy grail, with OTLs the low powered amp is the holy grail. Of course, the smaller you make them the less efficient they get, although 5W OTLs are possible.
But if you build one that is single-ended, they get even more inefficient!
Unlike solid state amps though, where the 3rd harmonic gets squared by the power, in our amps the 3rd harmonic is a bit better behaved, so even at full power with zero feedback the THD can be at or below 0.5%.
Follow Ups:
RalphIMHO the Real GNFB-free SET-OTL have to be configured that power triode(s) OPS have to be connected conventionally as Anode followers but not as Cathode followers to get that recognizable genuine SET sound ,
but in the same time to make&get acceptable power amp efficiency ( Pin/Pout )from SET-OTL only way to go is to design custom HQ-LS with very high static Z .
__
"Art which does not have the appearance of art is true art."
- Old Roman saying -
Edits: 09/26/15
I would say there are two schools of thought (at least) for what makes the best SET. There is the big transmitter group and then there is the small triode group (who like the 300B, 2A3 and the 45), which are arguably more linear than the bigger and the indirect heated group...but severely limited in power.
I have gone somewhere inbetween with a parallel 300B and parallel 6C33C amps. I would, however, like to get hold of a good 211 based amp.
Now SEOTL, sure it would be terribly inefficient but 10 good watts with the right speaker might be the best option.
Morri,Just buy an FMA, you are near to manny , he will let you audition one at home and stop all this 1,2,4,5,10 watt nonsense ..
Regards..
Edits: 09/25/15
FMA?? Sorry, don't follow you.
BTW, I went to hear the Devialet 200 on a pair of Wilson Sasha W/P2s today. The speakers are 40K and the amp 7k. How was the sound?? Tight, clean and smooth but quite dry overall with overly damped sound decay and over damped bass. Not a terribly musical sound but listenable. I would bet that any good hybrid, PP triode amp or SET will make a much more interesting listen.
We also tried the Devialet 120 on a pair of the new Wilson Sabrinas. It was significantly less dynamic sounding than the Sasha and overall less interesting. I was disappointed with the overall sound for 20K speakers.
In the end it didn't change my opinion on the Class D sound. Sure they are more refined than many other Class D I have heard, I guess that is the influence of the small Class A amp helping out...however, it doesn't get there finally.
I would think the issue was more the WA speaker , than the Devialet's, again with Devialet the bigger the better , try the 400/400 and hear the difference. Albeit there is some lack of involvement with some Class-D, i did not experience that with the Devialet's , but the listening session was only for an 1 HR ...
FMA, I thought all Swiss knew this and Manny Huber ... :)Regards
PS, Dartzeel 108
Power output with 1kHz test signal
8-ohm load at 1% THD: 142W
4-ohm load at 1% THD: 158W
RUN .. !!!!
Edits: 09/26/15
1kHz signal at 10W into an 8-ohm load
Dartzeel NHB 108, I know Uncle Mikes and others like their sound alot , must be the same way others like high distortion SET toobs..
Edits: 09/26/15 09/26/15
What can I say? It didn't impress me at all and I heard it at the designers own house...but then I don't have Musical Fidelity "Titans" as my reference...
Have you tried FMA..? I think the Dartzeel would work well on your horns , high z-mag and sensitivity fits this amp distortion vs power profile ...
Again, what is FMA? I disagree with your assessment of the dartzeel data. It doesn't drop significantly with power so at the powers I am likely to use it will be signficantly more distorted than my tube amps and with lots of harmonics that are also not ideal for natural sound reproduction.
I disagree with your disagree, you still have to try and see if you like the Dartzeel distortion triats as much as your tooby distortion traits. I know it wont work for me , the Ribbon panels are 1.5 ohm and the bass towers are 3 ohms.
As to FMA, I'm shocked you are not aware of them or Manny Huber, its the best SS amplfiers in dah whole wide world , the only one better than toobs and in your backyard to boot.FMA:
Load Impedance:
No minimum impedance. The amplifier is designed for 1 Ohm to 10'000 Ohm systems. It can drive any speaker impedance (even below 1 Ohm) with dynamic (music) signals without any limiting, compression or other negative effects on the audio signal. Despite this, the amplifier is fully protected against short circuits, open circuits and all other adverse conditions via a unique onboard computer that continuously surveys all important parameters.
Regards.
PS : I have a knew tooby , an SET , going to use it in my studio, those mid field monitors are 91db/8 ohm small room , hope it gets close to the Cary's, sadly only 5 watts , listening distance is only 1M thou so , chip chip..
Edits: 09/29/15 09/29/15
And you seem not to be able to read anymore...I have heard it more than once and found it wanting...so I have "Heard" its distortions.
What kind of SET did you get? With only 5 watts it must be something small but at 1 meter it and 91db/watt meter it might be ok.
maybe if I need an arc welder someday I could consider this FMA...
I had the Cary CAD-572se monos a few years ago...they were pretty nice sounding...not too warm but natural. Measurements in stereophile from Martin Colloms look pretty promising...always wonder how they would sound if you removed the 2db of negative feedback that Cary applied...they could even make a pretty honest 20 watts. Now some friends have them and they love them with their AudioPlan Kontrast IIIsi speakers.
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