[Amps] cooling chimney?

[Bob Maser]

I have always been told that the most important characteristic of cooling 
glass tubes is that you have to cool the part of the plate cap where it 
enters the top of the glass envelope.  Overheating at that place can cause 
catastrophic failure.  I would be wary about using a Coleman lantern globe 
because of this.  Besides, why not just go out and buy the correct chimney 
that has been designed for the tube.  You wouldn't put recaps on a Porsche 
Carrera.

Bob W6TR
----- Original Message ----- 
From: "Carl" <km1h at jeremy.mv.com>
To: <hrd998cc at yahoo.com>; "Stirling Schmidt" <kc0nxm at sbcglobal.net>; "AMPS 
submit" <amps at contesting.com>
Sent: Monday, July 14, 2008 4:04 PM
Subject: Re: [Amps] cooling chimney?


> This goes back to the 60's so I have no idea what is relevant today nor 
> what
> country those parts are made in now.
>
> Id suggest doing a Google and see whats current in discussions.
>
> And a call to Eimac should also generate an answer.
>
> Carl
> KM1H
>
>
> ----- Original Message ----- 
> From: "Russ Williams" <hrd998cc at yahoo.com>
> To: "Stirling Schmidt" <kc0nxm at sbcglobal.net>; "AMPS submit"
> <amps at contesting.com>; "Carl" <km1h at jeremy.mv.com>
> Sent: Monday, July 14, 2008 3:25 PM
> Subject: Re: [Amps] cooling chimney?
>
>
>> Carl, can you elaborate on the problems using Coleman chimneys?  I plan 
>> on
>> using them for a 4-400a project and also know of 2 other hams using them
>> in conjunction with GS-35b's.  It seems the Pyrex/borosilicate glass 
>> would
>> be ideal for this application.  If there have been confirmed disasters
>> using them, other avenues may need to be pursued.
>>
>> I suppose a test in the microwave oven would illuminate any faults in the
>> Coleman's glass formula...
>>
>> Thanks.
>>
>> Russ W6OHM
>>
>>
>>
>>
>>
>>
>>
>
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