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Re: [Amps] L4-B

Subject: Re: [Amps] L4-B
From: Al Kozakiewicz <>
Date: Tue, 1 Apr 2014 13:53:18 -0400
List-post: <">>
It was the cause of the MD-11 Swissair flight 111 crash off Nova Scotia that 
killed 229 people and has been noted in a number of other commercial airiner 
fires that did not end up in the loss of the aircraft.


From: Amps [] On Behalf Of mgb  
Sent: Tuesday, April 01, 2014 1:16 PM
To: mark bitterlich
Subject: Re: [Amps] L4-B

It seems that my posting regarding certain cautions that should be considered 
when using polyimide wiring made by Kapton (TM) has not met with much approval 
from the resident experts, in fact quite the contrary.  Everyone seems to have 
glowing reports about how reliable/durable/great this stuff is.

Remember please that I was only talking about CERTAIN Kapton WIRING, and I 
specifically pointed out that I knew nothing about the "tape" and that it may 
be just fine.

For those of you who might be curious about this issue, please read this report:

As you can see, this is fairly old news.

If any of you have difficulty accessing this report, I will be glad to send you 
a personal email with it contained as an attachment.

Best Regards,

Mark Bitterlich WA3JPY

----- Original Message -----
From: "Jim Thomson" <>
Sent: Monday, March 31, 2014 11:40:53 PM
Subject: [Amps]  L4-B

Date: Mon, 31 Mar 2014 16:18:41 -0700 (PDT)
From: Bryan Swadener <>
Also, Kapton(tm) aka polyimide tape will work FB.
It works well at high temperature and high voltage.

vy 73,
Bryan WA7PRC

##  I agree.  Kapton..aka..polyimide is used in one helluva lot of
xfmrs by power companies, etc..and a lot of those have xfmr oil
in em...running at high temps.   They don’t blow the military
applications etc....and on aircraft must be a one off failure anomoly.

##  I bought a lot of 10 ga polyimide magnet wire from SSON years ago,
also got it in 8 ga.   rated at 15 kv.    So 30 kv  from turn to turn.

##  Polyimide is also used..I think..for winding torroids.

##  Bottom line is u wont have any problems using it with ham HV gear.
##  On the L4B  power supply, just be careful.   The big bleeders can be tossed 
in the
trash..and the  50 ohm, 50 watt glitch can be installed in the RF 
deck...directly to the
miillen  HV connector.    No tape used.

Jim  VE7RF
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