[Amps] Cleaning tubes

[Colin Lamb]

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