[Amps] preserving tubes

[Carl]

The 3CX/3CPX800A7 is one of thoe tubes I have had zero outgassing or air 
ingress problems with.

After a long sleep I do let them warm up about twice the spec and then let 
them rip. That extra bit is probably a waste of time.

Carl
KM1H


----- Original Message ----- 
From: "Gary Smith" <Gary at ka1j.com>
To: <Amps at contesting.com>
Sent: Thursday, October 04, 2012 9:30 AM
Subject: Re: [Amps] preserving tubes


> I'm interested in knowing the general answer for any of the tubes. In
> specific I have a pair of 3PCX800A7 I bought when I had my Ten-Tec
> Titan and they were full output tubes. With the thought I may get an
> amp that uses them, I've kept them on a shelf but sold the amp. I
> also have a spare 3CPX1500A7 for the AL-1500 and that's at least a
> tube I can put in a rig.
>
> I have an Astron variable volt and amp PS which can be used to hook
> up the 3CPX800's to let them warm up for a period, if that would be
> of help. If not, I don't want to bother.
>
> Gary
> KM1H
>
>> It depends upon the tube Gary, some are known to degrade (outgas) and 
>> others
>> arent. A few have poor air seals and turn to paperweights.
>>
>> If you have the means to regetter before applying full HV or RF then do 
>> it.
>> Most of the indirectly heated types just require a day or so of filament
>> voltage only.
>>
>> Otherwise pull a Dirty Harry.
>>
>> Carl
>> KM1H
>>
>>
>>
>> ----- Original Message ----- 
>> From: "Gary Smith" <Gary at ka1j.com>
>> To: <amps at contesting.com>
>> Sent: Wednesday, October 03, 2012 12:20 AM
>> Subject: [Amps] preserving tubes
>>
>>
>> > Is there any benefit to taking a ceramic tube on the shelf and
>> > running it every so often and then returning it to the shelf to
>> > archive it for a backup when needed? Or os it just as well to let it
>> > sit until needed?
>> >
>> > Gary
>> > KA1J
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>
>
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