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>Message-ID: <3310EBC9.E20@stc.net>
To: <amps@contesting.com>
>Date: Mon, 24 Feb 1997 01:15:53 +0000
>From: Ron Hooper <ab4ru@stc.net>
>Reply-To: AB4RU@stc.net
>Organization: Is there life after Contesting?
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>To: Robert <w5robert@blkbox.COM>
>CC: amps@contesting.com
>Subject: Re: [AMPS] Glass bottles (tubes)
>References: <9702201914.aa25239@blkbox.COM>
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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
>>
>> --
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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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