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Old 7th April 2013, 12:04 PM   #1
Tube747 is offline Tube747  Hong Kong
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Default Vote and Comment: SRPP vs. Aikido vs. Grounded Grid

What's your choice and comment for each philosophy?
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Old 8th April 2013, 09:17 AM   #2
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Originally Posted by Tube747 View Post
What's your choice and comment for each philosophy?

Depends on the application. None is a panacea.

Cheers

Ian
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Old 8th April 2013, 10:34 AM   #3
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What's your choice and comment for each philosophy?
What do you mean by "grounded grid"? Bruce Rozemblit's circuit is not a "grounded grid" in any meaningful use of the term.
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Old 8th April 2013, 10:58 AM   #4
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Originally Posted by ruffrecords View Post
Depends on the application. None is a panacea.

Cheers

Ian
100% correct!

A big consideration in line stage selection is power amp drive voltage requirements. Pick a horse for the course.
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Old 8th April 2013, 11:42 AM   #5
jim is offline jim  Belgium
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Could you perhaps show some examples of each topology in it's best application?
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Old 8th April 2013, 12:12 PM   #6
45 is offline 45  Italy
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Originally Posted by jim View Post
Could you perhaps show some examples of each topology in it's best application?
The grounded grid is pretty common in HF gear but has not many applications in audio mainly because of its low input impedance. However there is one where this could be desireable: input stage of MC phono preamp.

I personally don't like SRPP even as a simple line preamplifier. Mu-follower is a lot better.

I think the Aikido is the best of the three thanks to its excellent performance and flexibility.
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Old 9th April 2013, 11:14 AM   #7
DF96 is offline DF96  England
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Quote:
Originally Posted by Tube747
What's your choice and comment for each philosophy?
These are not philosophies but circuit architectures.

Is your question to be interpreted as
"how long is a piece of string?"
or
"please write a textbook chapter and post it here free of charge".

As has been said already, grounded grid is rarely used in audio - it comes into its own for UHF and microwave front-ends. The audio circuit sometimes wrongly called 'grounded grid' is not grounded grid but cathode coupled - or short-tail pair.
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Old 9th April 2013, 06:24 PM   #8
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What do you mean by "grounded grid"? Bruce Rozemblit's circuit is not a "grounded grid" in any meaningful use of the term.
As was indicated by DF96, Rozenblit's circuit is semi-misnamed, and is better referred to as a coupled-cathode. This is a compound gain stage comprised of a cathode follower input driving a grounded grid output, the halves coupled via their cathodes. J. Broskie is fond of this configuration, and his analysis (plus his own variations) can be found on his site.
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Old 9th April 2013, 06:31 PM   #9
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As I recall Rozenblit's circuit, or one of its iterations, the "grounded grid" is actually used for feedback, so it doesn't act as a shield.
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Old 10th April 2013, 12:26 PM   #10
Tube747 is offline Tube747  Hong Kong
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What about this one? Aikido + SRPP from Menno Vanderveen, and it looks very interesting!!

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