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Old 27th February 2006, 11:40 PM   #1
SY is offline SY  United States
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Default Survey: Aikido distortion

I'm curious if anyone who's built an Aikido has done any distortion measurements, especially harmonic distribution. Some circuit particulars, too, please.
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Old 28th February 2006, 03:17 AM   #2
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My goodness, all that interest, all those boards, all those builders, and nobody has put the thing on the bench???
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Old 28th February 2006, 06:30 AM   #3
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One should have a suitable bench ;-)

Me not, at least for the moment.

Cheers

Andrea
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Old 28th February 2006, 09:21 AM   #4
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Hi SY,

Quote:
Originally posted by SY
My goodness, all that interest, all those boards, all those builders...
That was yesterday. Like with all fashions, yesterday means yesteryear.

What might be the next fashion? Maybe using pentodes as pentodes in small signal circuits? Oh, what a truly shocking alta moda that would be

Yawning, Tom
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Old 28th February 2006, 10:25 AM   #5
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Quote:
My goodness, all that interest, all those boards, all those builders, and nobody has put the thing on the bench???
If people knew how to do proper distortion measurements. They would not be ordering boards but would do point to point. The boards just make it that much easier (and neater).

The only distortion measurements I know of are on John Broskie's site.

http://www.tubecad.com/2005/January/blog0032.htm
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Old 28th February 2006, 10:38 AM   #6
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OK measurements are measurements ... maybe some O/Scope shots ...

Or just listening impressions ... do ya prefer it or the now-classical-outoffashion CF/SRPP/etc... ?

Ciao
Gianluca
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Old 28th February 2006, 11:09 AM   #7
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Mine is P-to-P, 220V B+ circuit in Blog 30. 6CG7 into 5687. CLCRCRC PS with regulated 12V DC heaters. I built it on a chassis from a AES AE3 preamp using mostly the existing power supply.

Sound is better than the AE3, which was a typical voltage amp-cathode follower 6SN7 affair. Better in every way. Dead quiet, more dynamic and detailed. More true to life for lack of a better term. Piano sounds like piano - nothing soft or muddled, nothing edgy.

No measurements except the one that counts - listening pleasure.

MG
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Old 28th February 2006, 11:40 AM   #8
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I was asked by the creator of the Aikido PCB's to do a test between 1.25mA and 2mA Ia. Sonically irellevent. Because of that, I never 'scoped it.

I agree with maynardg - "No measurements except the one that counts - listening pleasure."
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Old 28th February 2006, 11:41 AM   #9
SY is offline SY  United States
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Quote:
Originally posted by Bas Horneman

If people knew how to do proper distortion measurements. They would not be ordering boards but would do point to point. The boards just make it that much easier (and neater).

The only distortion measurements I know of are on John Broskie's site.

http://www.tubecad.com/2005/January/blog0032.htm
Yeah, I saw those, and that was a good starting point. I'm quite interested in the effects of tubes, operating point, and circuit trimming.

BTW, I'm an exception to your rule- I have it built on a board (one of Broskie's- it is a heroic PCB), yet I know how to do proper distortion measurements...
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Old 28th February 2006, 11:52 AM   #10
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BTW, I'm an exception to your rule - I have it built on a board (one of Broskie's- it is a heroic PCB), yet I know how to do proper distortion measurements...
There are always exceptions to the rule.
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