Forums
New posts
Search forums
What's new
New posts
Latest activity
Members
Registered members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Audio and Video Talk
General Discussion
Tube, Class A, Class AB Amps
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support AVForums:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="Ampdog" data-source="post: 7505" data-attributes="member: 144"><p>No Norval, I did understand what you meant.</p><p></p><p>I am just a little puzzled by this comparing of amplifiers with headphones ... sounding "a lot more powerful"?? How much power does one need for headphones? I rather suspect that this was a "fast volume control" syndrome: The sensation of power occurs when one gets a fair volume at low control setting - which of course only has to do with gain, not max. power. Also, at what must have been a low output setting, did he perhaps have cross-over distortion in the NAD?</p><p></p><p>One must be careful of thinking that the higher the quiescent current (bias) the cleaner the operation. The power transistor's conductance falls more rapidly as cut-off is approached, and "seamless" cross-over lies in that the to-be-conducting transistor takes over smoothly from the to-be-cut-off one. A too late an cross-over can give a conductance hump that will cause distortion of its own.</p></blockquote><p></p>
[QUOTE="Ampdog, post: 7505, member: 144"] No Norval, I did understand what you meant. I am just a little puzzled by this comparing of amplifiers with headphones ... sounding "a lot more powerful"?? How much power does one need for headphones? I rather suspect that this was a "fast volume control" syndrome: The sensation of power occurs when one gets a fair volume at low control setting - which of course only has to do with gain, not max. power. Also, at what must have been a low output setting, did he perhaps have cross-over distortion in the NAD? One must be careful of thinking that the higher the quiescent current (bias) the cleaner the operation. The power transistor's conductance falls more rapidly as cut-off is approached, and "seamless" cross-over lies in that the to-be-conducting transistor takes over smoothly from the to-be-cut-off one. A too late an cross-over can give a conductance hump that will cause distortion of its own. [/QUOTE]
Insert quotes…
Verification
Post reply
Audio and Video Talk
General Discussion
Tube, Class A, Class AB Amps
Top