I just found this channel, I repair lots of radios. Don't know the history, of this radio, as I have not watched the other vids. But just watching this one, I would say you have either a control voltage problem, in the diode "drive" toi the osc switching. Or simply a PSU problem in the radio. One or more of the voltage regulators would be my first check. And then look at if the voltages are being pulled down by something. I really like the TS120 s/v radios as my father had them. Don't worry about transistors until you have the voltages correct. They look way to low.
I instantly thought of the bc54x as they're very common european transistors. If neither of the oscillators works and then they all gradually start working, it has to be something in common to all, so not in the oscillator circuit. Check supply rails, dc voltages, etc.
A BC546C (C is important) might be a good alternative for the 2SC460 but the Cpf-EB is 3X that of the 460 but at these frequencies it might not matter.
I just found this channel, I repair lots of radios. Don't know the history, of this radio, as I have not watched the other vids. But just watching this one, I would say you have either a control voltage problem, in the diode "drive" toi the osc switching. Or simply a PSU problem in the radio. One or more of the voltage regulators would be my first check. And then look at if the voltages are being pulled down by something. I really like the TS120 s/v radios as my father had them. Don't worry about transistors until you have the voltages correct. They look way to low.
I instantly thought of the bc54x as they're very common european transistors. If neither of the oscillators works and then they all gradually start working, it has to be something in common to all, so not in the oscillator circuit. Check supply rails, dc voltages, etc.
fish radar or flying duck with visual display is another level sir
It takes a wizard to fix this wizardry 🧙♂️
Right after a visual I check voltages first, on everything.
2n3904 40V, 625mw, hFE=100-300, GBWP=300Mhz, Cout=4pf. A 2n2222 may not work since the Cout is 8pf which is double the 2SC460
A BC546C (C is important) might be a good alternative for the 2SC460 but the Cpf-EB is 3X that of the 460 but at these frequencies it might not matter.
I think *2SC2668* can replace 2SC460 in 10MHz-20MHz range. Still available on some market places.
The most hard to replace is 2SC1775A.
2n3866 is my vote.
Hell I would try a 2n3904, if it works it works. 60v, hfe 100, 300mHz GBP
I see similar comment below,...
And it's super common and inexpensive, that and the 06 is what I use with small projects.