Zenith Transistors

Here's a couple,,, help away!!! I would still like to find a substitution list, if one exists?
Not sure if even the unmarked ones use 121- as a prefix,,,


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Hey Hugo,,,
Thanks again for the info!!!! This is exactly what I was looking for!!!! I've been trying daily to find a replacement for TR503,,, and hoping some of the Zeniths I found and in my buddys stash may be helpful,, if I can ID them!!!!!
I hope all is well with you,,, thanks again for your help!!!

  • Thank You
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