[Boatanchors] tube markings

[B Riches]

A method of reading faded markings on the glass is to breath on the tube or 
put the tube in the fridge for a while.  When the glass fogs over you can 
sometimes read the number.

73,

Bill Riches, WA2DVU
Cape May, NJ
----- Original Message ----- 
From: CLIVE COLLINS
To: boatanchor network
Sent: Sunday, July 17, 2005 9:16 AM
Subject: [Boatanchors] tube markings


Good day Gentlemen

Does anyone herein happen to know why manufacturers of tubes didn't mark the 
type of the tube (6V6, 807 etc etc) in some form on the anode of the device 
where it would not rub off and still be visible when the tube was thrown 
away?
This goes the same for the Eimac ceramic and glass tubes, why didn't they 
engrave the type on the anode surface?

The practice of marking the outside with a low grade paint has always seemed 
to be a frought method of identification.

As this probably might be considered to be a bit wide of topic for the 
reflector, if it is considered to be then my apologies in advance (but I 
would still like to know !)

regards,

Clive GW3WEQ
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