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In Reply to: RE: Morri, Appreciate the effort, Dats some deep S*** , Conceptually WRONG ? posted by A.Wayne on September 18, 2015 at 05:14:32
"another could prove a class-a fully balanced load tolerant SS amp to be the winner , such is life ..
Unlikely given the kind of distortion pattern it is like to generate.
"Output transformers would be a no no , Driven load and application sets the animal"
Why would output transformers be a no no? Speakers that are pigs to drive are usually terrible with low level resolution anyway...I know only some electrostats and a ribbon or two that are exceptions but for box speakers...forget it.
"we can agree most design metrics suggested will work when designing an SOTA amplifier , be it toobs or sand , but , its not all or nothing ..."
Well, I did mention that SEP or SE(trans) might work to some extent but as the devices are not as linear (maybe Nelson's SIT amp?) as triodes you are back in the harmonic hot water again. SE OTL if you really don't need much power could also be possible, IF you don't need a ton of negative feedback for it to work.
"Could you link the measurement of an SET amp with a flat distortion curve ..?""
You mean distortion vs. frequency I presume?
Here you go:
http://www.soundstage.com/revequip/lamm_actual.htm
http://www.stereophile.com/content/lamm-ml21-monoblock-power-amplifier-measurements#bSyfUPLf64sMRp5q.97
The Lamm ML2 and 2.1 have quite flat curves...the ML2.1 actually has lower distortion at the highest frequencies.
Follow Ups:
Morri, yes it's flat to 20K at 2.83V and exhibits some tilt up in the Bass, But you will have to admit the Lamm is special and not at all indicative of what others are using and this is only if you are using it below 2.83V ..
The lamm is not "special" it is just done right.
Except for the one you took off your list ... :)
Well, its push/pull, remember?
A couple tenths of a percent doesn't really count now does it?
Look at the 2 watt IMD spectrum for the ML2.1...not bad at all...compare it to a darTZeel and LOL!!
Having heard both at length (i heard the darT in the manufacturers own home and listening room with their fancy preamp...I didn't get the review...guess I couldn't hide my disappointment in the sound well enough) and the Lamm with both on a compatible speaker will trounce the darT sonically.
You are wrong about something else...you can push it and the distortion character isn't going to change...just increase. But as loudness increases the sensitivity to the distortion also decreases...
NO way to comment on that until i can see thd vs freq at more than 2.83V...
http://www.soundstage.com/revequip/lamm_actual.htm
first figure shows 18, 10, 5, 1 and 0.1 W into 8 ohms...not much change.
figure 2 shows same THD vs. power regardless of frequency as well
Now you can comment...
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