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In Reply to: RE: SUN SV 2A3 stereo SE amp .... MEASUREMENTS posted by elblanco on April 01, 2015 at 18:17:07
Yeah, when you look at what's actually going on in this "de-stressed" 2A3 amplifier, lack of stress isn't actually an inaccurate way of describing things. When you push the output stage, the 2A3 just shuts off for part of the waveform, and gets to take a little break during playback.
Most of us who build single ended amps consider this bad design (or maybe just sloppy design). It isn't that hard to imagine one or two people out there who really like the sound of that much asymmetrical THD.
Follow Ups:
I believe the whole idea is to give the amplifier a certain 'flavour' . Not only does the inadequately filtered , higher impedence supply give it's own heavy footprint but also the driver . The driver usually being a flimsy device with inadequate current to drive the output stage anywhere near 0 grid volts so the asymmetric clipping not that much of an 'issue' . You get the bandwidth back with the wiring , or so I'm told...
Tons of distortion , rolled off due to the driver and much lower power . May as well use a type 45/4P1L and a higher ratio OPTX IMO for the same output power . If people like the sound of such amplifiers , good on them but I usually prefer in the amplifier as a whole , the output transformer to be the limiting factor
Al
Yeah, I mean, such an amp will sound very different than most others, it's just whether you like or your system needs those limitations imposed on it.
Hiah Al,See this, he is LOCAL to you. Visit him one day.
His first build ever !!
Jeff Medwin
Edits: 04/02/15
Not local at all , it's a nasty 40 mile drive to the other side of town through some of the worst traffic you could possibly imagine . That amp you mention uses a 5k optx strapped on the 8 ohm tap with 16 ohm speakers , if I remember correctly . So his loading is totally different to what you advocate and he also has an active sub for bass .
Al
Al,
40 miles is nothing.
I used to drive a 400 mile truck route every night for years and often in horrible winter weather.
Get up early before the traffic gets too bad.
It is your chance to listen to a JM designed amplifier in a good system.
How can you pass up this opportunity?
Don't you want to hear it for yourself?
DT 667
I'll be perfectly frank with you : I have no time and no interest...
If it's so good , why don't you jump on a plane and hear it yourself ?
Al
RMAF in Denver would be more likely since DF & JM would be there and I could hear the legendary SS product line.
Excuses, excuses, excuses Al.
Jeff
Have you heard this amp ?
Al
No, but I designed it for him. He is more than 40 miles travel distance for me Al.
His FIRST audio build, which I think is unusual and interesting as a DIY start place !!
Nice guy, awfully nice person.
Jeff Medwin
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