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Zenith prescribed the following for the transistors in your radio:
Source is Zenith Transistor spec guide 902-656, dated Feb 1970.
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
It doesn't show the 121-350 or 121-351.
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."
Zenith almost certainly consolidated the older part numbers into newer part numbers. I have a series of Zenith Parts Listings with Zenith specified replacements on microfiche, but my microfiche reader has a bad bulb, else I could help there. NTE replacements would almost certainly work, but they get pricey....
Cheers,
__________________
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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