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Single Ended: the pentode retaliation
Single Ended: the pentode retaliation
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Old 15th June 2021, 11:37 AM   #81
zintolo is offline zintolo  Italy
diyAudio Member
 
Join Date: Sep 2012
Some comparative curves for a-g1 plus UL and the related LTSpice file.

Single Ended: the pentode retaliation-10-g1-10-ul-jpg

Single Ended: the pentode retaliation-20-g1-20-ul-jpg

Single Ended: the pentode retaliation-30-g1-30-ul-jpg

Single Ended: the pentode retaliation-40-g1-40-ul-jpg

Single Ended: the pentode retaliation-40-g1-23-ul-jpg

Single Ended: the pentode retaliation-40-g1-23-ul-jpg
Attached Images
File Type: jpg 10%a-g1&10%UL.jpg (808.3 KB, 79 views)
File Type: jpg 20%a-g1&20%UL.jpg (309.4 KB, 79 views)
File Type: jpg 30%a-g1&30%UL.jpg (346.7 KB, 79 views)
File Type: jpg 40%a-g1&40%UL.jpg (360.3 KB, 80 views)
File Type: jpg 40%a-g1&23%UL.jpg (387.7 KB, 79 views)
File Type: jpg 40%a-g1&-23%UL.jpg (387.7 KB, 79 views)
Attached Files
File Type: asc Curves CED UL.asc (2.0 KB, 1 views)
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Old 15th June 2021, 12:05 PM   #82
zintolo is offline zintolo  Italy
diyAudio Member
 
Join Date: Sep 2012
What I notice is that with 10% a-g1 feedback, curves seem more linear, whilst with higher percentages there's an area with lower gain around the knee.

Last test is just to show the prevalence of the a-g1 compared to a-g2 (UL) feedback.
Last plot is a "super-pentode" like configuration, with a-g1 feedback.
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Old 15th June 2021, 12:57 PM   #83
Bandersnatch is offline Bandersnatch  United States
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Join Date: Jul 2003
Location: Ann Arbor, MI
Quote:
Originally Posted by zintolo View Post
What I notice is that with 10% a-g1 feedback, curves seem more linear, whilst with higher percentages there's an area with lower gain around the knee.

Last test is just to show the prevalence of the a-g1 compared to a-g2 (UL) feedback.
Last plot is a "super-pentode" like configuration, with a-g1 feedback.
The last one being like the Mac U-C design, yes? Works towards keeping g2-k voltage constant, or at least less variable.( not sure of the magnitude of cathode voltage swing ).
cheers,
Douglas
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