Hi, I am trying to find out what is the package of the BJT type S10-12 and 2sc1589,
They are used in a vintage (80s) Yaesu FT-301S HF transceiver, in it's power amplifier (10W output only).
The circuit of the amplifier is on page 22 and the components on page 44 of the PDF.
I am trying to find out if the packages of these transistors are ceramic (which can be more easily broken and expose any possible BeO) or plastic.
No I don't, I just worry because the TX is not working (of course there are lots of reasons for that) and one of the reasons might be a broken ceramic transistor, especially if the equipment has been dropped to the ground from a height at some point in the past (second hand). The case of the transceiver does not show that kind of damage...
Decades ago, I have broken a ceramic planar transistor on an FM transmitter by screwing it too much on the heatsink (it was one of these types with a single central screw to the heatsink) when already soldered to the PCB above. Didn't get BeO poisoning, but perhaps it's base was not destroyed, I don't remember now.
So I am a bit concerned about the transceiver, how to handle it when I service it etc.