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Re: [Amps] glass tape scotch 27

Subject: Re: [Amps] glass tape scotch 27
From: "Will Matney" <>
Date: Wed, 14 Jun 2006 08:30:34 -0400
List-post: <>
I'm glad you retired at 32, some of us don't have that luxury, nor can afford a 
high priced tape if it's not called for. I'm simply asking a question to all 
who are saying they use this tape.


*********** REPLY SEPARATOR  ***********

On 6/14/06 at 5:58 AM tim jenkins wrote:

>> well i tend to use the best i can , i dont quibble over a few bucks ,
>or pinch pennys, mabey thats why i retired at 32, why settle for average
>when u can use the best
>> From: "Will Matney" <>
>> Date: 2006/06/13 Tue PM 02:31:22 EDT
>> To:
>> Subject: Re: [Amps] glass tape  scotch 27
>> What I'm wondering is why one would need a tape rated at 130 C (266 F)?
>The core should not get no where near that hot, maybe just warm to the
>touch which would be around 100-110 F (37.7-43.3C). Ferrite supposed to be
>non-conductive which would only leave sharp corners which can be removed
>easily with a piece of emory cloth if they have them. You can also place a
>wood dowell through the center of the toroid and use a wire brush wheel on
>a grinder to remove them very quickly from the O.D.. I generally just keep
>a piece of emory cloth on the bench and smooth them that way. It don't
>take too long to do it. I've seen many cores, both iron powder (which most
>has a painted coating), and ferrite without tape that has lasted for
>years. I wouldn't doubt that regular tape like the filament tape I
>mentioned would work just fine. Matter of fact, I know a company that used
>that tape to install the RF power meter in an amp which was mounted where
>the tubes were close, and heat actually mel
>>  ted the meter back when the fan quit. The tape was still ok. I cant see
>one vibrating enough to cause this either. If it does, something like the
>blower or fan is way out of balance, and ought to be replaced. The newer
>varnishes on magnet wire is pretty tough, especially if it has Teflon
>insulation like Teflon hook up wire. On toroids, you need all the space
>you can get to hold the wire if it will be a good amount, so a thin tape
>ought to be used if possible like Kapton. That is if any need be used at
>all like a good amount which does not. On input tune cores, tape means a
>lot of space where they are small. On output tank coil toroids for 80 or
>160 meters, I've seen both taped and non-taped used. I just can't see
>where this expensive tape would be needed here for this purpose.
>> Best,
>> Will
>> *********** REPLY SEPARATOR  ***********
>> On 6/13/06 at 7:14 AM tim jenkins wrote:
>> >scotch 27 is high temp with thermosetting pressure-sensitive ashesive
>> >operates at class b 130 deg C ( 266 deg F) temp.  tim kv4bk
>> >scotch 27 glass cloth electrical tape
>> >
>> >kv4bk @ amps4u
>> >
>> >_______________________________________________
>> >Amps mailing list
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>> >
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>kv4bk @ amps4u

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