That's just it. I prefer to compare the specs of a substitute with those of the part being subbed. That way I can decide which parameter needs to be close, and which ones need only be in the ballpark.
An audio circuit won't care much about a difference if Ft, but RF circuits probably will.
For decades we used databooks from CQ publishing in Japan. Couldn't read the text, but the specs had english equivalents alongside the kana. This worked for all the "2S" parts so long as you had an up-to-date copy. They also published diode, FET and integrated-circuit databooks for jap-numbered parts. Had a transistor-substitution book, too. Listed the part-to-sub on the left, and had a column for each japanese transistor manufacturer. Some parts would show subs from 8 or 9 different brands. Other more-specialized transistors might only show one or two competitors selling a part that matched. Tricky part was figuring out which brand name went with each chicken scratch at the top of a column. No english translation was shown for that.
In this era, alldatasheet.com has most newer stuff. Another one, datasheet archive has more obsolete stuff.
You'll need some heavy-duty bruiser transistors for the TS940 main regulator. Much more cost-effective solution is the switchmode supply and regulator board built to match the TS940. Installed the equivalent kit in my TS930. Never regretted it. They use the name Compudigital Industries, web site is:
https://k6iok.com/
Repairing up the analog power supply got really annoying in the 930/940 radios. Seems the regulator board would always sustain damage. I've had it in my 930 for over a year, no trouble yet. Also, got tired of the linear's temp sensor going bad. Hooked up the fan to run when the transmitter is keyed, and shut off when you unkey. Not everyone's favorite solution, but it works for me.
73
