[ARC5] Tape

[don davis]

Yes, Teflon has been used with some success in commercial gear if care is
taken to keep all stress and pressure off of the wires.  I re-wired a
Farfisa organ years ago with small gage Teflon that seemed to work OK.  My
main reference frame is experience with NASA and other hi-rel space
applications where Teflon is generally banned due to severe cold-flow
(especially during soldering) and nuke charging, and out-gassing.   I guess
"awful" is relative, but I would avoid since there are so many superior
materials readily available.

Dd

-----Original Message-----
From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
Behalf Of Bill Cromwell
Sent: Thursday, April 25, 2013 4:05 AM
To: Arc5 at mailman.qth.net
Subject: Re: [ARC5] Tape

On Thu, 2013-04-25 at 03:47 -0700, don davis wrote:
> Yes, Kapton is the right stuff.  Teflon is awful.  Mylar film can be 
> used OK as well as polyolefin tubing.  Spaghetti tubing made of 
> fiberglass is OK and is period correct.  RTV might work - but ONLY 
> electronic grade.  Leads can also be epoxy coated to immobilize them.  
> Lead inductance shouldn't make a difference with electrolytic caps at
audio frequencies.
> 
> 73 de don ad6PB


Hi Don,

I have some teflon insulated wiring that has been in place for years.
Apparently the memo about how awful teflon is wasn't out and that wiring
doesn't know any better than to work. Maybe those other products are better
choices in new applications today.

Maybe the post about the lead length came from somebody who didn't know
these caps are not being used at UHF. At power and audio frequencies the
inductance doesn't amount to anything at all.

73,

Bill  KU8H

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