27-02-2017, 05:16 PM
O.K., I just printed an enlarged copy of Mark's diagram at the library. This is much better for me than trying to follow the thread on a 2 inch mobile screen. I will be back on this topic with a full breakdown of the circuit, to the best of my understanding so far.
Apart from that, I found today these P and MP type transistors even in Russia are only available as NOS. The Russian hobbyists themselves appear to be using substitutes.
Oh, on the diagram I can see the - and + bias at each junction. With PNP types I know the emitter base junction will have a + bias while the collector base junction will be negatively biased. So resistance at the base collector junction will be pretty big.
On Mark's diagram the 47 K and !0 K have obviously been chosen to set the correct bias.
That's it till later.
Apart from that, I found today these P and MP type transistors even in Russia are only available as NOS. The Russian hobbyists themselves appear to be using substitutes.
Oh, on the diagram I can see the - and + bias at each junction. With PNP types I know the emitter base junction will have a + bias while the collector base junction will be negatively biased. So resistance at the base collector junction will be pretty big.
On Mark's diagram the 47 K and !0 K have obviously been chosen to set the correct bias.
That's it till later.
