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Old 19th June 2017, 12:43 PM   #11
JMFahey is offline JMFahey  Argentina
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Location: Buenos Aires - Argentina
There´s "proximity" and "proximity"
A couple parallel wires an inch away or more can have how much parasitic capacitance coupling between them? 1pF ... 5 pF? ... same as 0

Now if you tightly *twist* them, copper to copper may close down to 1 or 2 mm, with a nice plastic dielectric between them ... mutual capacitance can become 50 times as much, and become significant.

FWIW Radio transmitter gain stages used to be "neutralized" , meaning "made stable", by feeding back some RF out of phase and in a controlled way by using "gimmick capacitors" .... 2 short pieces of wire (and I mean *short*, 1/2" or less) , twisted together more or less tightly.
So wire to wire capacitance is a very real and useful phenomenon.

Notice value and position of the gimmick capacitor Cpk:
Click the image to open in full size.

Is a 0.1pF capacitor significant?

You bet

You sometimes see such a connection made by means of a "gimmick" capacitor merely consisting of two wires twisted together.
Click the image to open in full size.
Design/make/service musical stuff in Buenos Aires, Argentina, since 1969.
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Old 19th June 2017, 01:04 PM   #12
DF96 is offline DF96  England
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Interchannel crosstalk from speaker wires is more likely to come from inductive coupling.

Twisting a pair of wires is likely to raise capacitance but this should not be a problem. Given that the load is low impedance when compared to the line characteristic impedance it is line inductance which dominates - and this is minimised by keeping the wires close together.
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Old 19th June 2017, 04:13 PM   #13
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Nothing is better than a good cheap superconductor. If below -270 °C, still better.
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Argentine Ham Radio LW1DSE since 1987.

Last edited by Osvaldo de Banfield; 19th June 2017 at 04:23 PM.
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Old 21st June 2017, 03:55 AM   #14
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I have already twisted them into separate L/R pairs as I said, and they will travel to the terminals separately without contact.
Originally Posted by DF96 View Post
I am not sure what the heatshrink is for - I would not bother. Keep some distance between the two channels; definitely do not twist them together!
They pass under a heatsink, it's hot (Class A).
Wouldn't exceed the temp-rating of the insulation though, so I can skip that if not needed or undesirable for some reason. I didn't have a temp rating for the other wire which is why I considered some secondary insulation initially.

I'll keep some distance between them as advised.
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