what resistors are in the aikido signal path

jarthel · 23rd May 2006, 12:33 AM

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, 01:56 AM

I would say R3, R9, and R8.

Nixie · 28th June 2006, 11:44 PM

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

SY · 28th June 2006, 11:50 PM

"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, 12:21 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, 12:34 AM

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

Nixie · 29th June 2006, 02:22 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, 02:35 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...

See what I mean about this being a marketing term?

Nixie · 29th June 2006, 02:41 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, 06:35 AM

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

23rd May 2006, 12:33 AM	#1
jarthel diyAudio Member Join Date: Jan 2002 Location: somewhere in Australia	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.

28th June 2006, 11:50 PM	#4
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	"Signal path" is a marketing term, not a technical one. Define what you mean precisely by that and the answer will be evident. __________________ If there's a sucker born every minute, where do the rest of them come from?

29th June 2006, 12:34 AM	#6
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	Well, then that's every resistor in the circuit. __________________ If there's a sucker born every minute, where do the rest of them come from?

29th June 2006, 02:35 AM	#8
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	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... See what I mean about this being a marketing term? __________________ If there's a sucker born every minute, where do the rest of them come from?

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23rd May 2006, 01:56 AM	#2
mourip diyAudio Member Join Date: Apr 2004 Location: Washington, DC	I would say R3, R9, and R8.

28th June 2006, 11:44 PM	#3
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	I'd say, simulate it. There are plenty of free spice models for tubes.

29th June 2006, 12:21 AM	#5
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	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.

29th June 2006, 02:22 AM	#7
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	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.

29th June 2006, 02:41 AM	#9
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	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.

29th June 2006, 06:35 AM	#10
jarthel diyAudio Member Join Date: Jan 2002 Location: somewhere in Australia	accordign to Mr. Broskie, r2, r3, r4, r8, r9 and r11 are the most important resistors in the circuit

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