Ayre's KX-R reviewed in November 08 Stereophile - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 26th October 2008, 12:17 AM   #21
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
When I finally made the breakthrough with the Grateful Dead, I designed a line amp with 20K open loop bandwidth. That became the Levinson JC-2 line amp, because Mark Levinson evaluated it as well. Why?
  Reply With Quote
Old 26th October 2008, 12:33 AM   #22
Account disabled at member's request
 
Join Date: Oct 2008
Why, what?
Is this a quiz?
The JC means John Curl, the number 2 indicates that it the second line amp.

You are also using the same number now on the Parasound JC-2
  Reply With Quote
Old 26th October 2008, 02:39 AM   #23
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
The answer is the reason for this thread.
  Reply With Quote
Old 26th October 2008, 05:41 PM   #24
Account disabled at member's request
 
Join Date: Oct 2008
Aha ok.
  Reply With Quote
Old 26th October 2008, 09:18 PM   #25
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
I should be more clear. The original Levinson JC-2 and the Parasound JC-2 share one quality approach: Fets where possible, class A operation, balanced topology, high open loop bandwith. This works for me, but it is not shared by many quality IC designs.
The JC-2 always follows the JC-1. It is an interesting parallel that Parasound called the preamp the JC-2, when Levinson did the same thing 35 years before, or in 1973. In Levinson's case the preamp followed the JC-1 pre-preamp, and in Parasound's case the preamp followed the JC-1 power amp. I allowed this to happen, but I did not initiate it.
  Reply With Quote
Old 26th October 2008, 10:02 PM   #26
diyAudio Member
 
Terry Demol's Avatar
 
Join Date: Apr 2002
Location: *
Quote:
Originally posted by PMA
I believe that Charles is only waiting for a good question on a "Variable Gain Transconductance" .
PMA,

Variable 1st stage degeneration??

On a fully balanced, open loop design why would you do it any other
way?

cheers

Terry
  Reply With Quote
Old 26th October 2008, 10:46 PM   #27
Account disabled at member's request
 
Join Date: Oct 2008
John

Thank you for being clearer.
I do agree in what you are writing, but must admit that Iím not using many Fetís.
I use BJTís with cascode and of course CCS and current mirror.
Maybe I should try to use some more fetís.

What did happen with the Vendetta Company and products?
Wouldnít there be a market for the active x-over now that more and more people are looking for an active solution instead of putting a lot of Cís Lís and so on between the amp and the loudspeaker?

And it is good to know that you didnít initiate the use of the same name on the products.

Stinius
  Reply With Quote
Old 26th October 2008, 10:48 PM   #28
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
The use of first stage degeneration SHOWS that Charles is OK with local source degeneration or local feedback.
  Reply With Quote
Old 26th October 2008, 10:52 PM   #29
Account disabled at member's request
 
Join Date: Oct 2008
Quote:
Originally posted by Terry Demol


PMA,

Variable 1st stage degeneration??

On a fully balanced, open loop design why would you do it any other
way?

cheers

Terry
I donít think he is talking about degeneration, but about the volume control.

Stinius
  Reply With Quote
Old 26th October 2008, 11:07 PM   #30
diyAudio Member
 
Terry Demol's Avatar
 
Join Date: Apr 2002
Location: *
Quote:
Originally posted by stinius


I donít think he is talking about degeneration, but about the volume control.

Stinius
Variable degeneration = variable transconductance = volume control
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
SIīs Son of T-Amp reviewed in 6moons PauSim Class D 15 9th October 2005 09:45 PM
NW DIY EVENT November 22 RAW Multi-Way 3 24th November 2003 07:32 PM
November NEWSLETTER from A.C.A. skaloumbakas Analogue Source 0 14th November 2003 12:00 PM
November 11 Fred Dieckmann Everything Else 15 13th November 2002 03:59 PM


New To Site? Need Help?

All times are GMT. The time now is 08:48 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2