[TCML] Identifying tubes

[ashumate3@xxxxxxx]

This was passed on to me - If you have an old tube that you can't see the  
number try putting it in the refrigerator for a while - remove it and gently  
blow on it. Many times the numbers are etched onto the glass and the warm moist  
breath will bring out the number.
 
Al Shumate



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