Screen Driven Dissimilar Pentode SE Anti-Triode Spud - diyAudio
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Old 23rd July 2008, 02:19 AM   #1
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Join Date: Nov 2007
Location: Dallas
Default Screen Driven Dissimilar Pentode SE Anti-Triode Spud

Drawing as discovered on cave wall.
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Old 23rd July 2008, 02:23 AM   #2
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Join Date: Nov 2007
Location: Dallas
Experts disagree...

I thinkn V1 might be a voltage controlled current source.
V2 seems to screen driven with external-insic feedback.
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Old 26th July 2008, 02:22 AM   #3
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Join Date: Nov 2007
Location: Dallas
As of this drawing, neither Anti-Triode nor Spud. Shoot me!

The 6DJ8 StackOdified MuFollower at the left shouldn't prove
much of a head scratcher. Driving 10K into the output stage's
Screen Driven A2 External-insic 4th Circuit Emulator network is
where my noodle really seems to get wrapped around a fork.
I am far from certain the values specified on the right side are
anywhere near optimal.

The part count at first glance does seem kinda high:
But on the other hand, only one component is a cap.
PSRR is probably as good as the constant current sinks.
And bias in both stages is auto-set by sunk current.
B+ design will be dirt simple.

A few of the parts I drew could easily be omitted:
24K that limits screen current in event of an arc...
1M just in-case the pot at the input has gritty spots...
50R degenerative feedback below the Stackode...
A whole mess of lossy ferrite beads...

Q: Is Stackode equivalent to a Triode Strapped Cascode?
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