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Old 1st November 2013, 12:09 AM   #71
ChristianThomas is offline ChristianThomas  United Kingdom
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Join Date: Feb 2006
Location: On a hill, in a wooden shack, next to the woods, in Somerset.
Quote:
Originally Posted by davym View Post
I would have to get some sent over from the US, that can get very expensive.

If I can get some fairly cheap, I might have a go at winding some for low values but inductance issues could be a problem. I'll look into it a bit further.
Yes, inductance will be an issue, even for low values. This is why Sfernice resistors are something like 6 a pop in singles.

Low TC is important but you can also achieve the same end (not changing the resistance) in a number of ways, one of which is paralleling them up.

It is also worth noting that if your TCs and power dissipation don't match in a feedback loop, even if one is brilliant, you have lost the battle already. And, if you are going this far then you had better look at the 3900ppm TC of the copper on your track, which dwarfs the whole lot.
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Old 4th November 2013, 03:14 AM   #72
jameshillj is offline jameshillj  Australia
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Join Date: Feb 2005
Location: Melbourne
You might ask the guys at LCI if they have any of the Manganin wire still available - this is the 'old stuff' that was made by Isabellenhutte quite a few years ago - the Rhopoint resistors from England have a similar sound particularly in comparison to the Z-foils that sound similar to the Isotan/Constantan wire, and are also about the price of those Sfernice ones.
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Old 4th November 2013, 05:16 PM   #73
davym is offline davym  Scotland
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Join Date: Jul 2013
Location: The Wetback
This is something I intend to have a go at but it's probably going to have to wait a bit now, too much going on and Christmas is coming up far too fast. Uriah sent me a link to an article about winding resistors, doubling up the wire to reduce inductance.

DIY_Copper_Wire_Resitors
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Old 4th November 2013, 05:29 PM   #74
tubesguy is offline tubesguy  United States
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Join Date: May 2002
Location: Madison, WI
Hey Uriah - I've got one of these amps sitting unused in the basement. Count me in if you do the GB, probably for boards and bits.

Happy to hear that you're doing well - Pat
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