What's a Mu Follower?

[Michael Wesemann]

Last question for today :-)

Can somebody tell me in short what a mu follower is?

Thanks.

________ michael __________________________________________________
http://www.muc.de/~majortom/analogue/amusic.htm

[Michael Wesemann]

[Steven L. Bender]

On Jun 04, 1996 20:37:48 in article <What's a Mu Follower?>,

A cow licker ???

But, seriously, that might be another term for a cathode follower providing
no mu ( no voltage gain ), but lower Z to drive next stage with.
--
--

Steven L. Bender

[Henry A. Pasternack]

Steven L. Bender (slbe...@nyc.pipeline.com) wrote:

: But, seriously, that might be another term for a cathode follower providing

: no mu ( no voltage gain ), but lower Z to drive next stage with.

Sort of. But, in fact, it's a compound circuit consisting of a
common-cathode input stage driving a current source load. The output
of the circuit comes from the cathode of the current source, which
is a low-impedance node, rather than the higher-impedance plate of
the input tube. Compared to an SRPP circuit, which is basically
the same idea, the mu-follower has some bias tricks to improve the
performance of the current source. It's called a mu-follower because
the high impedance load provided by the current source allows the
input tube to operate at a gain approaching its 'mu' -- plate
resistance times transconductance. In addition, the upper tube acts
not only as a current source, but also as a cathode follower.

Some people say the mu-follower is the bee's knees in gain
stages; others say the compound connection creates more problems
than it solves.

Who's to say?

-Henry

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Mandatory grammar note: "Lose" (as opposed to find); "Loose" (opposite of
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[Steve Arruda]

majo...@muc.de (Michael Wesemann) wrote:
>Can somebody tell me in short what a mu follower is?
>
>

>________ michael __________________________________________________

Michael,

A Mu Follower is a type of SRPP. The circuit has been written about on several
occasions by Chris Paul in Audio Amatuer and Glass Audio. Also, Bruce Rosenblit
wrote a wonderful pre-amp article using the circuit. The ciruit has a
relatively low output impedance. It is called a Mu Follower because the gain of
the circuit approaches the Mu, or amplification factor, of the tube used.

Steve