26-10-2020, 01:24 PM
Murphyv310 Wrote:The output transistor obtains its bias from the 27k resistor between collector and base,
Yeah, sorry I must have been looking at a different diagram, Still bad though. A lot of circuits I've seen in old magazines had no biasing at all, I suppose they self biased with the leakage. I have experimented with 2N1302 and GS 109 germanium's but they seemed to be quite well behaved.
I found also that bad biasing causes a transistor amplifier to have non linearity distortion so the gain isn't constant.
In view of the cost of the crystal fuse in the fifties you'd have thought they would have spent a bit more on a few resistors

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