 
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
|
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
76.90.36.216
In Reply to: RE: Properly designed SE amps posted by Ralph on October 04, 2021 at 12:40:55
"Distortion cancellation won't remove actual musical information, just distortion. Its never perfect of course. But what that means isn't that some music got thrown out; it means that some distortion got left in the signal. "
I just wanted to add to that for clarity. The distortion cancelled by a differential circuit is just the distortion that would otherwise have been created by the circuit, not distortion present in the signal from the source. On a related topic, the hum/noise picked up by the cable is the only thing "rejected" by a balanced connection between units, not any hum/noise present in the signal on the recording. Either way, none of the music is being filtered out by these methods.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
TRE and Ralph:Thank you BOTH for the excellent discussions.
You've given readers a good grip on how the
circuits you describe are supposed to work.I agree with you both, but I DO hear ANYTHING
that complicates a circuit, adding and subtracting
it's own artifacts, no matter what it is.For instance, CCS. Lots of people use them in many
ways and swear by them-- no argument there.Trouble is, I and others can hear the extra circuit
operating on the music. With the best circuits, and
speakers, it's subtle, but obvious. I really hate CCS circuits
because I can spot one operating anytime I hear it--
in anyone's amp-- two sounds for every one that's really
there. It's very small, and it's subtle. But over months of
use, CCS circuits eventually become musically boring.Another most excellent performing Band-Aid. BUT,
you can HEAR the thing doing it's thing....A super simple amp with a huge power supply can feed
the load without a CCS circuit better, and not color
the musical timing cues.So------- a few of us break a few rules now and then.
And why do we do that, when everybody knows we're WRONG?It's only because that's how we get really good
performance.I've been doing this all my life. When racing Motocross bikes,
I always had more usable power than the other guys in the same class.
They ran more RPM's= more horsepower.BUT-- I had more low-end torque AND decent hi-rev power, but
not as much as theirs.. TRE would call my engine linear and point
out that my amp isn't truly linear, only my Motocross engine is!
(the engine was putting better power to the ground, sooner).Most people today listen to a lot of single-taste music,
and build amps for their tastes, which is fine with me.I don't like that because I want to play anything I want
and have IT sound right-- no matter what it is.So----ooooo---- what is necessary gets done, trying to
keep it all simple, transparent, and honestly dynamic.It is perfect? No, it's not perfect. But it is reliable,
and you never want to replace it with something else you've
heard somewhere else.Overall, not to any particular taste. It's still not
perfect, it's still not absolutely linear, it's still
got some forms of distortions-- like everything else.It does do one thing right: it plays music like it really
sounds. With your kind understandings, it could make some
sense to you. The reviewers and the guys who play with it
agree-- even if you don't, and I am sometimes at a loss
to explain it all in engineering terms because I don't
groove-out on bringing-up online data-- I figure people
can easily already have that..After all, when a tube is operated in the lower 3/4 of
it's linear curve, why would it sound good? It might not--
unless the system is transparent enough to convey what's
taking place-- the sound of unstressed physics playing
through minimal interference circuitry..Anything-- everything-- that you do to force a vacuum
tube to comply with YOUR demands for some coveted thing--
linearity, loading perfection, etc., is audible as
something or somebody tampering with music if the audio
system playing it is sensitive enough so you can tell.Vacuum tubes-- above all-- operate best when as little
as possible is attached to them, and their operating
temperatures don't stress them in any way.-Dennis-
Edits: 10/04/21
I don't use a CCS in single-ended circuits so I can't comment, but I use them in differential amps all the time and I do have this to say:
Most CCS circuits I've seen are detrimental, because they leave performance on the table and often have linearity problems. I solved that issue about 25 years ago by implementing a 2-stage CCS in our circuits. By having 2 stages it could be referenced to ground at one end- so it knew what 'quiet' was supposed to be; at the other end it was referenced to the power supply, so it could suppress noise from the power supply as well. You really do need a 2-stage CCS to get the job done.
In our amps the power supplies were not regulated. So the performance was affected by line voltage. With the CCS installed as described, the performance of the voltage amplifier circuit was unmeasurable with the line voltage variable from 105VAC up to 130VAC. The CCS over that range varied in performance by 17 parts per million. That's pretty sweet- works really well to reduce noise and distortion while increasing gain.
I can't speak to use in single-ended circuits.
GOOD STUFF. Wonder how many DIY guys are NOT paying attention to what you typed here. Thank You, Ralph.
The Mind has No Firewall~ U.S. Army War College.
Thanks, Ralph. I like that it "sees"-- both sides--
that's an excellent idea, and a good implementation of it.
A two-sided CCS. Better-- much more so,
it's a far more stable circuit.
-Dennis-
-
| FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
||||||||||||||
This post is made possible by the generous support of people like you and our sponsors:
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]
