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In Reply to: RE: ALT. 1. posted by cpotl on January 10, 2015 at 20:55:49
"Does the increased impedance affect the ability to deliver current or affect the voltage at a given frequency? How does this translate sonically?"
Weak bass.
Follow Ups:
I would question this : Does your friend know how to build an amp properly, or, is he like you ??
Jeff Medwin
Weak bass. This was a couple years ago so maybe there's some revisions since then?
It was powering a 2A3 amp that had perfectly good bass response with the traditional supply.
Edits: 01/11/15 01/11/15
Correct, and that is certainly not the case in Dennis' amps or mine, so, the simulation is inaccurate, looking at the wrong thing, or both !!!!
Jeff Medwin
"...the simulation is inaccurate, looking at the wrong thing, or both..."I think the simulation is looking at the right kind of thing, namely how the power supply responds to the kind of loading an SE amplifier might put on it. I'm not claiming that the simulation is completely accurate for the specific details of your rectifiers, etc. And the capacitor and inductor values may not be precisely those you would choose to use in your preferred supply. Those could easily be changed, of course.
But I think the broad features are going to remain qualitatively similar, even if some of those changes are made. If the supply has a resonance in the (low) audio spectrum, then it is going to exhibit some ringing also, in the low audio spectrum.
Chris
Edits: 01/11/15
I don't know why it's so hard for someone who likes that supply to just say they like the sound of a sloppy supply. It obviously sounds better to their ears.
"I don't know why it's so hard for someone who likes that supply to just say they like the sound of a sloppy supply. It obviously sounds better to their ears."
Yes, I agree. Jeff says he likes the sound of it. Basic EE theory and simulations say that it indeed has some characteristic features that quite possibly could account for there being audible differences between it and a more conventional power supply. It should not be too much of a stretch to make the link between these two statements.
Chris
It would be interesting to know how low Drlomu's speakers go.
If they are anything like the 9cu' delirious stereo speakers, they probably don't go low enough to be effected by the impedance hump anyways. :P
Chris,You only theorize.
Have you ever actually gone to a show, etc. and heard a Dennis Fraker 2A3 DC amplifier? Yes or No ?
Any idea why it got " Best Sound at Show " 2005 RMAF by Mr. S. Harrell, writing for Six Moons ??
Jeff Medwin
Edits: 01/11/15
See Jeff's link, first picture on the right.
Top right photo is the rear view of one of Dennis' amps. Notice the Cardas binding posts, and what appears to be an AVVT meshplate 2A3.
Jeff Medwin
I'm sure it was a damn good performing amp with those Slagle transformers.
Though I have experienced only 4 manufacturers in my DIY career, nothing has come close to reproducing the music so beautifully until I purchased a pair from Dave. Well worth the extra $$ and I cant say enough about them until you hear a pair yourself. And did I mention they test really well, I'll have to post a square wave of my amp one of these days. It almost looks like a good transistor amp, you almost wouldn't know a transformer was in the signal path.....
Edits: 01/12/15
For the record, Dennis does not use my transformers. From the looks of it I suspect those are MQ from mike (acrosound)
dave
Hi Dave.
Yes. The guys in the brass covers are mine (MagneQuest).
MSL
Builder of MagneQuest & Peerless transformers since 1989
Hiah Dave.....
Correct, Magnequest.
Hope you are well, long time no see !! My fault. Regards and best wishes.
Jeff
nickel core ;-) , my bad. I was lured by the end bells....
Yours are still better!
Edits: 01/12/15 01/12/15
"Chris, You only theorize."
So, if I understand correctly, you do believe that your power supply gives your amplifiers a special quality that makes them sound better. But you don't like any suggestion that this might be associated with any distinguishing features of the power supply that could be calculated, simulated or measured?
So you therefore dismiss any evidence based on theory or measurement that might support your claim that your power supply gives the sound a special quality, because you would prefer to believe that the special characteristics of your power supply must necessarily be unmeasurable and uncalculable by any methods known to science?
Chris
I don't recall reading somewhere that you said the supply necessarily sounds bad. Thanks for your diligence.
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