Windex
Carl
KM1H
----- Original Message -----
From: "Ken Brown" <ken.d.brown@hawaiiantel.net>
To: <amps@contesting.com>
Sent: Sunday, June 13, 2010 6:37 PM
Subject: [Amps] Cleaning tubes
> Hi all,
>
> I have a bunch of old tubes which have not been stored properly. I want
> to clean them up before checking filaments and then offering them for
> sale or trade to hams.
>
> I expect this topic must have been covered here before, yet a quick
> search on "tube cleaning" did not find any results that were helpful.
> What I would like to know is: What is the best way to clean tubes,
> without leaving any residue that would have negative effects on the
> tube's ability to dissipate heat, and which would also not remove the
> part number and brand name from the tubes? Perhaps the best way is to
> cover the label to protect it while cleaning the rest. How about the
> aluminum bases on tubes such as 813? What is the best way the clean
> those without scratching them.
>
> I would also like to know if there are any easy ways to check tube
> efficacy, without having an amplifier that uses the tube type I want to
> check. Of course I already know how to light up the filaments with the
> correct voltage to see if the filaments are good, and I would do the
> basic interelectrode short testing with a VOM or DMM. Is there some easy
> way to determine whether a tube is likely to be good, short of operating
> it in a amplifier? Some sort of cathode emission test? I presume that I
> would need most of a whole amplifier circuitry and power supplies to do
> a real transconductance test.
>
> Thanks in advance for any useful suggestions,
>
> Ken N6KB
>
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