Inductive resistors for source resistors

bbakota2000 · 23rd March 2005, 01:52 AM

What is wrong with inductive resistors as source resistors in Alephs?
I searched the forum but nobody explained it, everybody are just prefering non-inductive resistors. Why is that?

jh6you · 23rd March 2005, 03:02 AM

Personally, I prefer the wire-wound resistors here and there.
People say that they are concerned about the inductance.
But, the amount of the energy being stored in the magnetic field in the region surrounding the current-carrying wire-wound is considered too small and ignorable to interrupt audio frequencies, IMHO

bbakota2000 · 23rd March 2005, 03:05 AM

Do you prefer wirewound because of their better sound or because of their reliability?

jh6you · 23rd March 2005, 03:58 AM

Because of both.

grataku · 23rd March 2005, 04:29 AM

It's good to have inductive resistors in the CCS side because they increase the CCS impedance, minimally at audio freq. Anyway, at the very least any amount of inductance there is a plus.

Nelson Pass · 23rd March 2005, 10:41 PM

I've never had so much inductance on the resistors that it
showed up as an issue.

mikelm · 23rd March 2005, 11:46 PM

Can I suggest that you try constantan wire - I have used this as emitter resistors on my JLH type amp and also in my crossovers. It sounds very good to me - much better than the caddocks thick film that I had been using and is very cheap.

I was using wire of about 4.2 ohms per meter

available from here

http://www.wires.co.uk/

mike

eLarson · 24th March 2005, 02:49 AM

Did you wind it around some kind of former? Or did you just use a straight length of the wire?

mikelm · 24th March 2005, 09:21 AM

For the values that I needed on the amp the wires were about 25mm so I just used the wire straight

in the crossover I used some blank veroboard 30mm square, inserted some PCB pins either end and zig zagged the wire back and forth

|\|

like that only stretched higher...

peranders · 24th March 2005, 10:21 AM

Quote:

Originally posted by Nelson Pass
I've never had so much inductance on the resistors that it
showed up as an issue.

I'll guess this is an issue the faster you want the output stage to be and/or the more feedback you apply.

23rd March 2005, 01:52 AM	#1
bbakota2000 diyAudio Member Join Date: Jan 2004 Location: Croatia	Inductive resistors for source resistors What is wrong with inductive resistors as source resistors in Alephs? I searched the forum but nobody explained it, everybody are just prefering non-inductive resistors. Why is that?

24th March 2005, 02:49 AM	#8
eLarson diyAudio Member Join Date: Aug 2002 Location: Gaithersburg, MD	Did you wind it around some kind of former? Or did you just use a straight length of the wire? __________________ I'm thinking of a new MMORPG for the older, garage workshop crowd: World of Woodcraft

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23rd March 2005, 03:02 AM	#2
jh6you Account Disabled Join Date: Aug 2002 Location: Near to the Pacific Ocean	Personally, I prefer the wire-wound resistors here and there. People say that they are concerned about the inductance. But, the amount of the energy being stored in the magnetic field in the region surrounding the current-carrying wire-wound is considered too small and ignorable to interrupt audio frequencies, IMHO

23rd March 2005, 03:05 AM	#3
bbakota2000 diyAudio Member Join Date: Jan 2004 Location: Croatia	Do you prefer wirewound because of their better sound or because of their reliability?

23rd March 2005, 03:58 AM	#4
jh6you Account Disabled Join Date: Aug 2002 Location: Near to the Pacific Ocean	Because of both.

23rd March 2005, 04:29 AM	#5
grataku diyAudio Member Join Date: Dec 2000 Location: -	It's good to have inductive resistors in the CCS side because they increase the CCS impedance, minimally at audio freq. Anyway, at the very least any amount of inductance there is a plus.

23rd March 2005, 10:41 PM	#6
Nelson Pass The one and only Join Date: Mar 2001	I've never had so much inductance on the resistors that it showed up as an issue.

23rd March 2005, 11:46 PM	#7
mikelm diyAudio Member Join Date: May 2003 Location: currently living & working is USA	Can I suggest that you try constantan wire - I have used this as emitter resistors on my JLH type amp and also in my crossovers. It sounds very good to me - much better than the caddocks thick film that I had been using and is very cheap. I was using wire of about 4.2 ohms per meter available from here http://www.wires.co.uk/ mike

24th March 2005, 09:21 AM	#9
mikelm diyAudio Member Join Date: May 2003 Location: currently living & working is USA	For the values that I needed on the amp the wires were about 25mm so I just used the wire straight in the crossover I used some blank veroboard 30mm square, inserted some PCB pins either end and zig zagged the wire back and forth \|\\| like that only stretched higher...

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