Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Tube markings are generally difficult to rub off, at least tubes less
than 50 years old. The early tubes were often marked with ink, which
could wear or be washed off. Miniature tubes mostly were marked with an
etch process that is very tough.
That being said, I would try to wipe them first with a dry cloth,
minimizing pressure or rubbing on the tube number. A cloth dampened
with water, not wet, would be the next choice.
Tubes that have had the number washed or rubbed off can often be read by
breathing gently on the glass, as in cleaning eyeglasses, which will
make the number appear. Another technique is to put the tube in the
freezer and then when it's removed the number will be visible briefly.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B & C-Line Service Supplement CDs
<www.k4oah.com>
Donley wrote:
When restoring a tube type radio, the restoration looks better when
the tubes are nice and shiny. But cleaning tubes is hazardous to tube
identification. The markings usually come off easier than the dirt.
What are recommended methods of cleaning tubes?
Also, is there a method of reading the markings on tubes that
have been smudged or with partially or totally removed markings? I
seem to recall someone mentioning that the markings slightly etch the
glass and there is a way to make the markings identifiable. Was I
dreaming?
If there is no way to identify an unmarked tube, what good is it?
Dick
KC9UB
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