[Collins] 4D32 question

[jeremy-ca]

They are not all of the same age. Raytheon built that tube from the 40's 
until at least 1980. The USAF batch appears to have a 10 year spread. There 
is also a FAA batch that was released but I dont know the date codes.

My concern was if seal leakage was a problem as it is with other tubes using 
similar construction; 826, 829B, etc. Apparently it is not.

Carl
KM1H


----- Original Message ----- 
From: "DW Holtman" <future212 at comcast.net>
To: "jeremy-ca" <km1h at jeremy.mv.com>
Cc: <collins at mailman.qth.net>
Sent: Sunday, August 05, 2007 9:23 PM
Subject: Re: [Collins] 4D32 question


> Hello,
>
> Just curious? Why? Aren't all 4D32's about the same age. Is there a 
> certain batch that has you concerned? Run them for a few hours before 
> transmitting and the getter should help improve the vacuum.
>
> Best,
> DW Holtman
> WB7SSN
>
>
> jeremy-ca wrote:
>> Im wondering if those USAF surplus tubes that have been showing up are 
>> OK. My concern is with gas and vacuum deterioration.
>>
>> Carl
>> KM1H
>>
>>
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>
>
>