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Old 23rd March 2005, 12:52 AM   #1
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Default 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?
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Old 23rd March 2005, 02:02 AM   #2
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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
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Old 23rd March 2005, 02:05 AM   #3
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Do you prefer wirewound because of their better sound or because of their reliability?
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Old 23rd March 2005, 02:58 AM   #4
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Because of both.
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Old 23rd March 2005, 03:29 AM   #5
grataku is offline grataku  United States
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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.
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Old 23rd March 2005, 09:41 PM   #6
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I've never had so much inductance on the resistors that it
showed up as an issue.
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Old 23rd March 2005, 10:46 PM   #7
mikelm is offline mikelm  England
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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
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Old 24th March 2005, 01:49 AM   #8
eLarson is offline eLarson  United States
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Did you wind it around some kind of former? Or did you just use a straight length of the wire?
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Old 24th March 2005, 08:21 AM   #9
mikelm is offline mikelm  England
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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

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like that only stretched higher...
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Old 24th March 2005, 09:21 AM   #10
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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.
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