From: whit3rd@gmail.com   
      
   On Sunday, July 23, 2023 at 4:04:23 PM UTC-7, Dave McGuire wrote:   
   > Hi folks, I'm looking to identify what I think is a transistor, in a    
   > TO-72 package (TO-18 with four leads), in an old Victoreen radiation    
   > survey meter. The number is "ITS 30487". It's also marked "7736" which    
   > I assume is a date code.    
      
   Hard to be sure, but Siliconix was making PFET junction FET discretes with that   
   package, like this one    
      
   [archiveorg bitsavers_siliconixdixLowPowerDiscretesDataBook_42980376 width=560   
   height=384 frameborder=0 webkitallowfullscreen=true mozallowfullscreen=true]   
      
   see page 120,  2N4867 series   
      
   If that's your item, pin 4 is the case (just a shield, not diode-connected to   
   anything).   
   There might be a S embossed on the can...   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)