The phase detector is most likely bad, this is the second Selenium diode type phase detector that I have come across so far, the first being in the one in my CTC-16 which it fine, but not this one, which almost every tester on diode test can't see it as a diode, even the fancy multi tester ( transistor/cap/resistor ) thinks that it is a capacitor.
But now the question is, what type of diode to replace it with, I'm sure there are many to choose from, but what one?