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Old 9th July 2008, 07:34 AM   #61
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Default #60

Hello jane,

QUOTE]Originally posted by jane


What are the main differences between the "gyrator" stage in your drawing and an ordinary mu-follower?

Jan E
[/QUOTE]

The gyrator replaces a coil ll resistor in my drawing.
A mu-follower provides -gain.
Strange question, is this a pitfall?

Darius
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Old 9th July 2008, 11:54 AM   #62
jane is offline jane  Norway
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Default Re: #60

Quote:
Originally posted by oldeurope
The gyrator replaces a coil ll resistor in my drawing.
I suppose you could say the same thing about a follower?

Click the image to open in full size.

In a mu-follower with fixed bias the driver tube will see ~Ra as the load at f<<fc and ~(Ra x mu+1) at f>>fc. You may replace the upper tube in this follower with a coil with Rdc=Ra and a parallel resistor Rs=(Ra x mu+1).

Jan E.
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Old 9th July 2008, 01:23 PM   #63
SY is offline SY  United States
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Jan, I had never thought of a mu follower as a gyrator before, but that makes perfect sense.
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Old 9th July 2008, 03:10 PM   #64
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Default #62 #63

Ok, let's feed the troll.

Quote:
Originally #62 posted by jane


I suppose you could say the same thing about a follower?

http://www.glass-ware.com/tubecad/TP1.gif

In a mu-follower with fixed bias the driver tube will see ~Ra as the load at f<<fc ...

Jan E.
In this case, it isn't a mu-follower.

Quote:
Originally posted by jane


I suppose you could say the same thing about a follower?

http://www.glass-ware.com/tubecad/TP1.gif

In a mu-follower with fixed bias the driver tube will see...~(Ra x mu+1) at f>>fc. You may replace the upper tube in this follower with a coil with Rdc=Ra and a parallel resistor Rs=(Ra x mu+1).

Jan E.
The question here is:
Is (Ra x mu+1)>> ra of the bottom tube?
In this case it is a mu-follower.

In my circuit (Ra x mu+1)<< ra,
thus it isn't a mu-follower.
http://bp3.blogger.com/_oCEpds9YoPw/...Darius+001.png
http://line-pre.blogspot.com/2008/07...eamp-2008.html

If you want a technical discussion, you must give more detailed
information. But I am sure you and SY do know this.link

The following picture gives an example.
This is a mu-follower:
http://bp0.blogger.com/_oCEpds9YoPw/...008_Darius.png
http://line-pre.blogspot.com/2008/07...ninverter.html

Kind regards,
Darius
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Old 18th September 2008, 01:56 PM   #65
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Default @ Don

Quote:
Originally #23 other threadposted by smoking-amp
sorta OT: Say Darius, I recall you were looking for a tube with a Mu of 1 a while back. I just ran across a data sheet that mentions just that (bottom 1st page):

http://www.mif.pg.gda.pl/homepages/f...093/6/6AH6.pdf

But probably rather high rp with this tube. Could try g3 drive with some low rp pentode instead.

Don
Thanks Don

Kind regards,
Darius
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