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#2
11-28-2014, 01:42 PM
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Zenith prescribed the following for the transistors in your radios:
Royal 1000: 121-44 2N370 121-45 2N139 121-46 2N109 121-47 2N270 121-48 2N371 121-49 2N372 Royal 3000: 121-44 2N370 121-228 2N1742 121-46 2N109 121-47 2N270 121-48 2N371 121-49 2N372 121-64 2N405 121-230 2N1745 121-137 2N1180 121-138 2N1180 121-139 2N1180 Zenith makes a point - "Due to wide characteristics within any given EIA or manufacturer's number, performance may not be identical to Genuine Zenith Transistors." Source is Zenith Transistor spec guide 902-656, dtd Feb 1970. Hope this helps,
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Brian USN RET 22YRS (Avionics/Cal) CET-Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit! 
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