Quote:
Originally Posted by stevehertz
the second one (the one I was referring to with the red spot on it) is in the upper right quadrant. I'm not sure what its function is. I'll check both.
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So far as I can make out that diode along with T3 etc form a stabilizer circuit for the Oscillator and Mixer.
According to radiomuseum it's a silicon diode:
https://www.radiomuseum.org/tubes/tube_d101.html
Lawrence.