Hot water PVC works perfect with the GS-35b(At hf) and shows no sign of
melting even at full output for an extended period of time. Four inch fits
the tube cooler and I have used this type chimney in my amp here for four
years with no problems.It`s also a lot nicer than trying to brew something
from a sheet of plastic,etc.I have not tried pvc at vhf/uhf....Has anyone ?
Jim,K7RDX.
----- Original Message -----
From: "R.Measures" <r@somis.org>
To: "Tomm Aldridge" <KD7QAE@ARRL.NET>
Cc: <amps@contesting.com>; "jeff millar" <wa1hco@adelphia.net>
Sent: Saturday, October 23, 2004 11:09 AM
Subject: Re: [Amps] High Temp silcone rubber sheet,was chimney material
suggestion GI35b
On Oct 23, 2004, at 9:02 AM, Tomm Aldridge wrote:
> Also, go to your local Target, Wal-Mart, etc cooking department and
> you will find Silicone baking sheets which are approx $10 / sq ft and
> fairly stiff so making a chimney should be easy. Other options from
> the same area of the store are Silicone cutting "boards" and Silicone
> trivits (hot pads). All of these will make respectable HV insulator
> material as well I would think.
Another way to go is to mod a round plastic food container with a
snap-on lid that is microwave oven safe: cut a hole in the bottom with
a dedicated (to plastic cutting), conical soldering iron tip, glue the
box to the chassis with silicone rubber, let cure for 24-hrs, cut a
hole in the lid that will snap on over the anode. // note: the
typical air temperature that comes out of an anode cooler is about
110ºF less than the softening point of such plastic.
>
>
> Tomm Aldridge wrote:
>
>> I believe you can get it from McMaster-Carr online.
>> jeff millar wrote:
>>> This question reminds me. Who supplies the red high temp
>>> (silicone?) rubber sheet used in chimneys on some of the commercial
>>> amps?
>>>
>>> jeff, wa1hco
>>>
>>> Manuel R. Alonso / KC4MNE wrote:
>>>
>>>> Hello
>>>>
>>>> Could PVC pipe be used for a chimney? If not were could I find a
>>>> suitable
>>>> material?
>>>>
>>>> 4" is perfect for the GI35b tube?
>>>>
>>>> Thanks
>>>>
>>>> KC4MNE
>>>>
>>>>
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>>>
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>
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>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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