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2 stage AIKIDO
2 stage AIKIDO
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Old 18th October 2010, 03:25 PM   #1
matejsirk is offline matejsirk  Slovenia
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2 stage AIKIDO
Default 2 stage AIKIDO

I need more gain then produced by standard AIKIDO. I need around 70. I need your opinion: Will this work?
I want to use next tubes: 6N6P as input and 6N23P as output
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Old 18th October 2010, 03:51 PM   #2
SY is offline SY  United States
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2 stage AIKIDO
You can't easily direct-couple the first two stages. In theory, you could RC couple them, then direct couple to the White cathode follower. If I needed that much gain, I'd be more likely to skip the Aikido topology completely and use a high mu tube as a common-cathode voltage amplifier. That would then couple to a cathode follower (or White cathode follower). Much lower parts count this way.
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Old 18th October 2010, 03:54 PM   #3
kevinkr is offline kevinkr  United States
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2 stage AIKIDO
I'm with SY on this one,but you should provide some more detail such as required signal levels, noise performance, output Z and the like.

Low level stuff could be handled quite effectively by just a single triode connected D3A for example, which if really low output impedance (below a couple of K ohms) is required could be handled by a white CF or even a plain and simple CF direct coupled to the plate of the D3A.
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