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In Reply to: RE: I believe it is true for you, but clearly not for everyone else...nt posted by Mike B. on November 11, 2015 at 09:48:55
"I guess the power supply and power output don't mean much?"
How is this relevant to output transformers? Last time I checked the output transformer is not considered to be part of the power supply. FWIW, power supply matters a lot and power output not so much.
"The tranny needs to have the bandwidth but it also needs enough drive"
It is obvious about the bandwidth but what the hell do you mean by drive? Do you mean that it has to be big enough not to saturate? If that is what you mean then that is obvious too. If it is not what you meant then you better explain yourself.
"I remain convinced that the majority of highly rated speakers available today cannot be properly driven with the lower powered SET amps discussed here.
"
Again, irrelevant unless you are a crack-addicted speaker roller (there are plenty of gear junkies who might agree with you). There are plenty of highly rated speaekers that will work wonderfully and that is sufficient. I will give you a tip on one top conventional speaker that works wonders with a SET...the original Wilson X1 Grand SLAMM and the MK3 version...apparently the XLF too (given that they often show with LAMM SETS). I have firsthand experience with a lot speakers that are driven very well with SETs, including those that would not be obvious given their lowish sensitivity. Load seems to be more critical than sensitivity.
Follow Ups:
"How is this relevant to output transformers? Last time I checked the output transformer is not considered to be part of the power supply"LOL. Well without going into details, you don't have a amp without the three components. They also define the limitations.
"Again, irrelevant unless you are a crack-addicted speaker roller (there are plenty of gear junkies who might agree with you). There are plenty of highly rated speaekers that will work wonderfully and that is sufficient. I will give you a tip on one top conventional speaker that works wonders with a SET...the original Wilson X1 Grand SLAMM and the MK3 version...apparently the XLF too (given that they often show with LAMM SETS). I have firsthand experience with a lot speakers that are driven very well with SETs, including those that would not be obvious given their lowish sensitivity. Load seems to be more critical than sensitivity."
You miss the Model A reference. Why should I have the limitations when I can get a amp that will drive all speakers and sound just as good?
I have linked to the tests by stereophile of the Lamm SET. Notice the distortion graphs.
Edits: 11/12/15
"Well without going into details, you don't have a amp without the three components"
OTLs do just fine without the "third" component...go figure.
THere is nothing in the Lamms measurements to suggest anything other than an outstanding sounding amp, which has been nearly univerally acknowledged as such. Have you heard this amp?? I have and it is very good.
"OTLs do just fine without the "third" component...go figure"
OTL's? I thought this discussion was about SETS? Weak
"THere is nothing in the Lamms measurements to suggest anything other than an outstanding sounding amp, which has been nearly univerally acknowledged as such. Have you heard this amp?? I have and it is very good."
I would hope it sounds good. It better for $34,000. It measures like most SET amps where I have seen test data. Low power, higher distortion characteristics. Those qualities I find limiting. I might or might not have heard this amp? It would have been at a show where conditions are not usually optimal.
It actually measures much better than most SETs...but since you don't seem to get it...
" and sound just as good?"
Because this part is wrong.
" and sound just as good?"
Because this part is wrong.
I think it safe to say we don't agree on this point.
nt
try it! you know you want to!
Actuality it looks better than you would think, notice how the THD rises gradually with output , this is how distortion is presented to us in nature, its natural for us to hear as such, this kind of distortion curve will give an amplifier a natural sound within limits.
JA used to do ms power burst to measure an amplifiers ability to output dynamic power into varying loads, it would be nice to see one done on this SET.BTW and FYI, Steve over on Wallet Big Forum (WBF), uses one to power his Wilsons, no one hearing his setup has complained about lack of bass or dynamics..
Regards..
Go Rossi ......
Edits: 11/12/15
nt
try it! you know you want to!
looks reasonable at 2.83v , you see sumting .. ? I'm more concerned with the 10K SqW , maybe not something for ESL's :)
Go Rossi ......
Edits: 11/12/15
"shows that the THD doesn't change significantly with increasing frequency, though it does increase alarmingly as the load impedance halves."
Flat, load independent frequency response is important....
try it! you know you want to!
Because of output tap, just keep the output tap lower than lowest Zmin and you are good and since its at the very extremes, it may not be audible when listening, especially if you are using limited bandwidth speakers or those overstuffed pint sized subs going to 20 hz .You know, the ones walking across the room when reproducing a pipe organ..
:)
Go Rossi ......
Edits: 11/12/15
nt
try it! you know you want to!
BTW, all amps have increase distortion with lower Z loads, whats important is the balance and PSU size, even Bruno have to give into that one ...
:)
Go Rossi ......
nt
try it! you know you want to!
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