i have a general set of question's i'd like to ask and they dont apply to a particular pioneer set so i hope nobody gets upset. firstly, it would seem that most zeners are glass cased but not all. are other diodes glass cased as well? in other word's are all glass cased diodes zeners? and are some common rectifiers glass cased? in the absence of any data and markings save for anode and cathode can they be identified to voltage and wattage? im looking at a peak zen50 but with numerous you tubes they dont seem to answer my question's except for avalanche voltage. the tester data doesnt seem to deal with a zener that changes value with heat any input is welcome.