#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 µ-gain.
Strange question, is this a pitfall?
Darius
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 µ-gain.
Strange question, is this a pitfall?
Darius
Re: #60
I suppose you could say the same thing about a follower?
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.
oldeurope said:The gyrator replaces a coil ll resistor in my drawing.
I suppose you could say the same thing about a follower?
An externally hosted image should be here but it was not working when we last tested it.
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.
#62 #63
Ok, let's feed the troll.
In this case, it isn't a mu-follower.
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...14Ucs/s1600-h/Gyrator_pre_2008_Darius+001.png
http://line-pre.blogspot.com/2008/07/der-gyrator-im-line-preamp-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.../6080_phase_inverter_line_pre_2008_Darius.png
http://line-pre.blogspot.com/2008/07/unity-gain-inverter-der-phaseninverter.html
Kind regards,
Darius
Ok, let's feed the troll.
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.
jane said:
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...14Ucs/s1600-h/Gyrator_pre_2008_Darius+001.png
http://line-pre.blogspot.com/2008/07/der-gyrator-im-line-preamp-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.../6080_phase_inverter_line_pre_2008_Darius.png
http://line-pre.blogspot.com/2008/07/unity-gain-inverter-der-phaseninverter.html
Kind regards,
Darius
@ Don
Thanks Don
Kind regards,
Darius
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/frank/sheets/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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