[Hybrid tellies]

Tried adding extra decoupling across the supply rails using various values of capacitance but did not make much difference. So after taking a break from it for a while I came back and did some more cold checks with the meter. I found the detector diode, which was a Ge transistor with a leg chopped off, on measuring it I am seeing 5-7k one way and 1-3 k the other way. Ge diodes and juctions should measure 200-300 ohms forward bias so think this needs further checking. If memory serves me correctly I could fit either an OA47 or OA91 diode here. Would be grateful for any suggestions.