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16th September 2019, 05:47 PM  #21 
diyAudio Member
Join Date: Oct 2004

Any particular model of Allen Bradley resistor?
Am sorting out a fet output amp and am looking at options. 
16th September 2019, 06:04 PM  #22 
diyAudio Member
Join Date: May 2018

If this inductance component of wirewound resistors manifests itself in real circuits, a frequency source can be used to obtain a table of readings as follows:
Column: Frequency/Hz, Voltage/V, Current/mA, Current Phase with respect to input voltage. Several reading (not less than 5) should be taken. Using an equivalent circuit for the resistor plus parasitic inductance and parasitic capacitance, the values of both can be calculated, and then tested to predict current and phase values out of the measurement range (extrapolation). The parasitic inductance is in Series with the resistance and the capacitance in Parallel with the series RL arm. The derivation of the formulae can be done using BOTH phasor diagrams (2D vectors), and complex numbers. Since these are measurable qualities of wirewound resistors, the quickest way to ascertain oneself of their behaviour is to measure them and simulate them.
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Thanks for helping me design my first amplifier. 
17th September 2019, 02:32 AM  #23 
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Join Date: Dec 2017


20th September 2019, 12:28 AM  #24 
diyAudio Member
Join Date: Oct 2004

Thanks, those are certainly getting harder to find it looks like.

20th September 2019, 02:02 AM  #25 
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Join Date: Oct 2008


20th September 2019, 05:09 AM  #26 
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Join Date: Dec 2017


20th September 2019, 05:34 AM  #27 
diyAudio Member
Join Date: Jul 2017

I agree with AllenB, I believe V coefficient has something to do with the way certain resistor material respond to transient in music.

20th September 2019, 06:49 AM  #28  
diyAudio Member
Join Date: Dec 2017

Quote:
AllenB talked about its effect on harmonic types when used in crossover. I didn't perceive any change in harmonics type by ears. It may also be undetectable when measured. In amps, V/T coefficients are probably the most important parameters, but not all. I don't even know what the most critical parameter that makes my favorite resistor (secret! ) sounds the way it does. 

20th September 2019, 11:32 AM  #29 
diyAudio Member
Join Date: Oct 2008

Some components in a crossover are either too small/large or in the wrong position to make any noticeable difference this way.
What else could there be to make a difference, carbon composition are noninductive? 
20th September 2019, 02:58 PM  #30 
diyAudio Member
Join Date: Dec 2017

I didn't find resistor type crucial in passive crossover. Sound different doesn't mean better or worse. In amps it is different. I think it is inductance.

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