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Old 11th July 2005, 04:07 PM   #1
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Default Improving the Aikido line stage...

Someone posted or mailed me that they had done some simulations and had come up with some added circuitry that could further increase the inherent psrr / noise reduction.

Anyone have any suggestions?

Here is my current Aikido schematic
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Old 11th July 2005, 04:26 PM   #2
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q: Why improve you might ask...

a: Curiosity
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Old 11th July 2005, 06:35 PM   #3
kopite is offline kopite  New Zealand
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Hi Bas, the biggest improvement (for PSRR) I made to my line stage was to add a Garry Pimm (latest version) CCS.
It is not the Aikido but the improvement was immediate and very noticable.
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Old 11th July 2005, 06:38 PM   #4
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Mmm maybe I should add a CCS to my PSU...

I know how silent that can make a PSU...my raleigh audio linestage uses a CCS in the PSU..and it is absolutely dead quiet!
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Old 11th July 2005, 08:06 PM   #5
rdf is offline rdf  Canada
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Hi Bas, I think that was me. I did a slew of sims before deciding against the Aikido in favour of an integrated amp and staying pure SE throughout the amplification chain.

Can't post any pics right now (at work). The concept's simple enough. Take V2 of the Ecc99 for example. Sims suggest the resistive divider network + cap forming the grid circuit can be optimized to greatly increase the stage PSRR ratio across a wide frequency range with just minor value tweaks. From memory the maximum untweaked PSRR simmed between 30 - 40 dB across a variety of tubes. In the ideal case optimizing can triple these values, though by that point it's probably hitting the limits of resisitor thermal stability and well past tube variances. In any case a doubling should be realizable.

I'll dig up the graphs and post once home tonight.
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Old 11th July 2005, 08:13 PM   #6
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Ahhh yes...'t was you..

I am very happy with the way it sounds, but I might just change those values to see what happens....

Quote:
I'll dig up the graphs and post once home tonight.
Thanks a lot! Sounds interesting..
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Old 11th July 2005, 09:55 PM   #7
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Sorry if this is a little OT....but what's with the sudden interest in line stages? Heretical, GG, Aikido.... I wouldn't think there are that many people with audio chains that actually need line stages. Are people just using the designs as front ends to light up big driver tubes?
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Old 11th July 2005, 10:46 PM   #8
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I don't know why..... I guess the sudden interest is just coincidental.
I guess..many are thinking of getting one for their gainclone..not really necessary I suppose. In my case it just a journey...a little research..I have the Raleigh Audio line stage which has 8dB gain. Now that I have the Aikido...I realize how much I needed to have more gain...

Plus the search for that magical driver stage for the 300B continues...and I would love to try the Aikido stage in that position...
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Old 12th July 2005, 01:21 AM   #9
agent.5 is offline agent.5  United States
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Personally, i am interested in using balanced aikido as the output stage of a DAC.
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Old 12th July 2005, 05:20 AM   #10
rdf is offline rdf  Canada
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Ok, first all the usual disclaimers. These are sims. I haven't built this circuit and confirmed the results with measurements. The tube models aren't mine. I'm not responsible for any damage or harm resulting from implementation of these recommendations, no animals were harmed in their production, do not employ under the influence of strong medication, etc, etc..

First the 'stock' circuit, the closest tried to yours but not exact.
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