Direct Coupled Choke-assisted Mu-stage - diyAudio
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Old 18th April 2005, 09:29 AM   #1
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Default Direct Coupled Choke-assisted Mu-stage

Attached is a schematics of DC Choke-assisted Mu-stage (as far as I know).

As I DIY novice, I would like to know whether this stage can be further improved by replacing the resistor Rk (at the tail of the pentode CF) by a current sink (triode) as shown. If yes, what're the areas of improvement? Lower output impedance? Better linearity in the pentode CF?

Any idea/advice is appreciated. Thanks in advance.
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File Type: pdf mu-stage.pdf (97.3 KB, 307 views)
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Old 18th April 2005, 07:18 PM   #2
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The bottom resistor won't change much, you'd be better off doing that to the screen resistor which might be in the range of oh, 10-100k. Unless your sink resistor is supposed to run more current through the pentode, then yes, you can use a CCS as well.

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