[Amps] Advice

[Roger]

Carl wrote:
> ----- Original Message ----- 
> From: "Bill, W6WRT" <dezrat1242 at yahoo.com>
> To: <amps at contesting.com>
> Sent: Monday, December 07, 2009 7:48 PM
> Subject: Re: [Amps] Advice
>
>
>   
>> ORIGINAL MESSAGE:
>>
>> On Mon, 7 Dec 2009 18:15:27 -0500, "Carl" <km1h at jeremy.mv.com> wrote:
>>
>>     
>>> If you want to critique Id appreciate it if you dont edit my post to suit
>>> your reply.
>>>       
>> REPLY:
>>
>> Ok, but in this instance it doesn't make any difference. Here's your 
>> entire
>> quote:
>>
>> "Some of the cooling specs appear to be highly variable. I suspect that as
>> engineering staff changed and tube application changed the combination
>> resulted in different numbers.
>>
>> In other cases the spec was written for CCS worse case wheras in ham 
>> CW/SSB use
>> the seal temperature caveat was used fo CYA. This leads to a lot of
>> guessing for home brew especially when temperature testing is not done."I
>>
>> I think where we are having a misunderstanding is your statement "Some of 
>> the
>> cooling specs appear to be highly variable."  If you mean AIRFLOW specs, I
>> agree. If you mean COOLING REQUIREMENTS, I disagree.
>>     
>
>
> I said cooling specs. What that refers to are tubes that the spec changed 
> over different revisions of the spec sheet. Seal temperature is a constant 
> these days but was not always so as processes improved..
>   
It's quite common when going through designs for ceramic/metal tubes 
from different times to see the maximum seal temps vary from 200 to 250C.

73

Roger (K8RI)
> Carl
> KM1H
>
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