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-   -   what resistors are in the aikido signal path (http://www.diyaudio.com/forums/tubes-valves/80062-resistors-aikido-signal-path.html)

 jarthel 23rd May 2006 01:33 AM

what resistors are in the aikido signal path

see title.

thanks for the help.

ps. looking at the schematic (http://www.tubecad.com/2006/04/27/ai..._amplifier.png) and my limited knowledge,

I am thinking: R1, R3, R4, R8, R9 and R14.

 mourip 23rd May 2006 02:56 AM

I would say R3, R9, and R8.

 Nixie 29th June 2006 12:44 AM

I'd say, simulate it. There are plenty of free spice models for tubes.

 SY 29th June 2006 12:50 AM

"Signal path" is a marketing term, not a technical one. Define what you mean precisely by that and the answer will be evident.

 Nixie 29th June 2006 01:21 AM

I think he means that signal current is going through them. That's what I take it to mean at least, that the simulation shows current waveform correlated with the signal through the resistors.

 SY 29th June 2006 01:34 AM

Well, then that's every resistor in the circuit.

 Nixie 29th June 2006 03:22 AM

Really? Interesting, I've never simulated a circuit that had signal current in all its resistors (at least that wasn't many orders of magnitude lower).

If you read Borbely's articles, he points out which resistors to spend money on as are in the signal path; for examle, http://www.borbelyaudio.com/pics/405borbely2506.pdf in the parts list notice some say RN60 as the type.

 SY 29th June 2006 03:35 AM

Well, then, you haven't defined things. Give a threshold at which you say "yes, signal current" or "no signal current." And think of the tiny signal currents involved in RC coupling...

 Nixie 29th June 2006 03:41 AM

Something bugs me about that circuit. As someone told me in the IRC channel, C4 carries a lot of signal current. So how is that any better than using an output cap then? Seems to me it would be better to have no cap and a very low output impedance regulator instead.

I remember Borskie from Tubecad Journal once tested a regulator and though it sounded better without a cap after it. Hmm.

 jarthel 29th June 2006 07:35 AM

accordign to Mr. Broskie, r2, r3, r4, r8, r9 and r11 are the most important resistors in the circuit

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