>>Subject: Re: [AMPS] Glass bottles (tubes)
>>References: <9702201914.aa25239@blkbox.COM>
>>Content-Type: text/plain; charset=us-ascii
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>>
>>Robert wrote:
>>>
>>> I've got an SB-220 that has been idle for a few years.
>>> I saw somewhere where I should fire up the 3-500Z every so
>>> often so the "getters?" can work on any gas in the tubes??
>>>
>>> The concern here is the spare 3-500Z that is new and
>>> sat in the box for about 5 years. Is there a storeage requirement
>>> for firing up the filaments every so often??
>>>
>>> use'um or lose'um?
>>> --
>>> 73 Robert W5AJ w5robert@blkbox.com
>>>
>>> --
>>> FAQ on WWW: http://www.contesting.com/ampfaq.html
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>>
>>Hello,
>> I dont think it would be necessary for the 3-500z tubes under normal
>>conditions. In a case where excessive plate voltage might be involved, I
>>would be a little worried about firing up old tubes that have been in
>>storage for many years. Where this really comes important is with the
>>tubes that have internal elements that are in closer proximity, such as
>>with a majority of the tetroids, 4cx family. You can measure the
>>resistance with a meg scale meter. I have used a Triplet 630 in meg ohm
>>position on 4cx tubes and watched the resistance increase as the filment
>>warmed up, on the work bench. That is why its important to have a delay
>>in plate voltage after the filament is turned on. I dont see why this
>>would not work on the old (instant on) 3-500z as well. It would
>>certainly not hurt it to have this feature built into the amp. In most
>>cases where the tubes have leaked out gas, and I got the resistance
>>reading good by heating them up, it was only a short time before they
>>blew anyway! I have always pushed the rating a bit too.
>>cya..Ron W4WA
>>
>>
>>
>>
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>
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Sponsored by: Akorn Access, Inc. & N4VJ / K4AAA
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