[R-390] Black Marker on Tubes

[Bruce Hagen]

The cathode & plate will never know.

Bruce

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]On
Behalf Of Joe Perge
Sent: Friday, December 16, 2005 2:31 PM
To: r-390 at mailman.qth.net
Subject: [R-390] Black Marker on Tubes

Hello,
Is it safe to use a Black Marker to mark the tube number on the
glass of a tube? Safe in the sense that it would affect
emissions inside the tube. I have found radios where someone
used a piece of paper taped to a tube with the shield over it! I
don't think that is safe.
Thanks, Joe, WB8HWF

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