[Amps] Cleaning tubes

[Patrick Barthelow]

If you have lost the tube markings on the tube envelope, try this which I remember from years ago.  Put the tube in the refrigerator, cool it down, then bring it into a warm room temp environment.  There will moisture condensing on the glass envelope, which sometimes leaves a readable outline of the tube numbers, which are otherwise no longer readable.

Best Regards,   
73, de Pat Barthelow AA6EG
 
 Date: Thu, 17 Jun 2010 10:08:37 -0700
 From: k7fm at teleport.com
 To: ken.d.brown at hawaiiantel.net; amps at contesting.com
 Subject: Re: [Amps] Cleaning tubes
 
 I have a friend who called me one day. He cleaned all the tubes in his HRO-50 with window cleaner. 
 
 The reason he called was because the cleaning fluid removed all of the tube identification. He asked me how to identify tubes without any identification. 
 
 Good luck. 
 
 Do not clean the tubes with anything that will remove the identification. Heck, a dirty tube will not hurt anything. I normally just wipe them off and plug em in.
73, Colin K7FM
 		 	   		  
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