Quote:
Originally Posted by Colourstar
I'm not overly familiar with transistor circuits, beyond knowing that the base should be about 0.6v higher than the emitter, which suggests that TX2 might show some promise. Beyond that I'm a little lost, so any help would be appreciated!
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Remember that that 0.6V is for silicon transistors. For Germanium it's more like 0.1-0.2V.
Any transistor where the base is lower than the emitter is not functioning correctly for some reason- either it's faulty or something else round it is.
The voltages around TX1 in the service sheet don't make any sense unless they're significantly affected by the meter used to measure them, but I would expect a silicon device should work fine there- its collector current would be a bit lower than for the OC75 but not seriously so.