 
|
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 |
75.168.81.35
In Reply to: RE: When you use name calling that is abusive on most websites. posted by morricab on March 05, 2025 at 01:37:00
There is no verbal abuse in changing the topic.
Any abuse victim understands what is going on when the topic changes as the prior topic was properly addressed.
This isn't about electronics; this is about you needing to be in control.
And again, even with your Class B circlotron tube amp, there is no measured proof that it has no zero crossing distortion.
100% BS. I have the amp in my shop. This is an excellent example of gaslighting. I though you were above this sort of thing. I'm not angry, just disappointed.
Follow Ups:
Your statements have no basis in reality, Ralph.
"Any abuse victim understands what is going on when the topic changes as the prior topic was properly addressed."
It was never properly addressed, no proof was ever given and now you want to further obfuscate your weak position by playing some sort of lame victim card. Pathetic...
"This isn't about electronics; this is about you needing to be in control."
No, it's about you proving something you claim. Of course you want to change the dialogue away from your lack of ability to demonstrate what you claim.
"100% BS. I have the amp in my shop. This is an excellent example of gaslighting. I though you were above this sort of thing. I'm not angry, just disappointed."
Great! Then it is very easy for you to post the proof. Again, you would rather rail against my challenge rather than just prove it and close the discussion...me thinks thou doth protest too much!
And another thing, you grasp of English and the meanings of words is poor. Go look up gaslighting and you will (if you were open minded) see that I my challenging you on this is not gaslighting. I am making a position statement that you are not able to debunk. Nevermind the fact that were were talking about SS amps and not tube amps in the original discussion. You then threw out a direction change with introducing a rare Class B tube amp that no one knows about and that has no real published measurements.
Your claims you have it on your bench is just that...a claim. Nothing more and nothing less. Show a picture of you with the amp and then the requested measurements...not that it changes my claim about Class B transistor amps.
I did debunk your specious claim that a solid state class B amp cannot operated without a zero crossing artifact. Link below.Your saying I didn't is false.
Great! Then it is very easy for you to post the proof.
Again, and for the 3rd time, what do you need to see as 'proof'? photos??
We both know what you will do when presented with that evidence.
Edits: 03/07/25
Doug Self lists the 8 types of distortion mechanisms when he is discussing his "blameless amplifier"
TABLE 1.
SOURCE ORDER SLOPE ORIGIN
1 Input stage (balanced) 3rd-order 18dB/oct Inherent
Input stage (unbalanced) 2nd-order 12dB/oct Inherent
2 Voltage Amplifier Stage 2nd-order 6dB/oct Inherent
3a Output stage LSN (4 Ohm) 3rd-order 6dB/oct Inherent
3b Output stage crossover Complex 6dB/oct Inherent
3c Output stage switchoff Complex Variable Inherent
4 Non-linear VAS loading Complex Flat Inherent
5 Decouple return in ground Even Flat Topological
6 Rail induction Even 6dB/oct Topological
7 Wrong feedback point Even Flat Topological
8 Capacitor non-linearity Odd 12dB/oct Inherent
The distortions we have been discussing are distortions 3a, 3b and 3c, which he lists as "inherent", meaning they are fundamental to transistor function.
He then states: "In a field like Audio where consensus of any sort is rare, it is widely acknowledged that crossover distortion is the worst problem afflicting Class-B power amplifiers. The pernicious nature of crossover distortion is that it occurs over a small part of the transfer characteristic, and so generates high-order harmonics. Worse still, this range is around the zero-crossing, so it is present at all levels, the THD percentage potentially increasing as output level falls, threatening very poor linearity at low powers."
Furthermore: "To further get the measure of the problem, Fig 23 shows how HF distortion is greatly reduced by increasing the load resistance, providing further confirmation that almost all the 8 Ohm distortion originates as crossover in the output stage."
So, a typical loudspeaker load makes the situation worse and particularly at high frequencies. The lower the impedance, the worse it gets for a Class B amp.
Finally: "This leaves Distortion 3, in its three components, as the only distortion that is in any sense unavoidable, as Class-B stages free from crossover artifacts are so far beyond us."
THat sums it up. He found a way to mostly eliminate all the distortions on his list EXCEPT distortion 3, which are inherent traits of transistors when running Class B.
Doug Self, himself, has declared that avoiding zero crossing distortion in Class B transistor amps is IMPOSSIBLE with current semiconductor technology.
How many times does it have to be repeated before it sinks in? Your saying something without test measurements to show is NOT a fact!!I believe data not your words. So, until you can demonstrate with measurements a Class B amp without zero crossing distortion then it is YOU who is trying to gaslight me, not the other way around. I see you like project what you do onto others... sad...
Edits: 03/07/25
| 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 © 2025, Audio Asylum, all rights reserved ]
