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  1. Mike58

    Unitrol 800 siren transistor question

    Unitrol 800 project update. So far so good. I was able to get the siren working today by replacing the dead SP3099 output transistors with Mospec 2N5683 PNP transistors. Powered up the unit and had full siren audio output. Tried the PA function but only heard clicking noises in the speaker...
  2. Mike58

    Unitrol 800 siren transistor question

    Hello MtnMan, Thank you for the info. I'm curious to see if i can revive this old unit. A matched pair of transistors will probably be a challenge to find but i'll look around. Thanks again. -Mike
  3. Mike58

    Unitrol 800 siren transistor question

    Hello everyone. I'm hoping for some help. I have an old Unitrol 800 series siren that has 2 blown SP3099 power output transistors. They are a TO-3 style matched pair located on the bottom of the unit. Does anyone know of equivalent replacements for these transistors? I can't seem to find them...
  4. Mike58

    Greetings from California

    Hello everyone, name here is Mike. Retired LEO living in Southern California. My hobbies include playing golf, HAM radio, electronics tinkering, occasional target range shooting and watching TV. I have always liked electronic gadgets and hope to fix an old Unitrol 800 siren unit. I look...

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