[R-390] Making Progress on the EAC R-390A project

[Roger Ruszkowski]

Jim,

There are two crystals in the crystal oven. One is 17 mhz for the first mixer. The second is 200 Khz for the crystal cal.

Since the receiver works on the lower 8 MHz. the 17 Mhz crystal is OK.

If the 200 Khz crystal goes out the flip flop will still run and you will get tones but just not at 100 Khz.
Around 500, 600, 700 you should find some tones if the flip flop divide by two 5814 is OK.

Likely crud. Oxide in a tube pin. Oxide in the crystal can plug, Oxide on the crystal pins inside the can.
A cold solder joint in the calibration oscillator and divide by two circuit. A fried resistor.

Time to pull out the RF deck again, and just do some serious eyeballing.
Lots of ohm meter probing on the resistors.

The only thing in common with the problem starting with your touching E210 is the possible but not established
fact, that both events may share the same reality and or universe. However, this is not truly knowable.

If you knew the abuse that has been heaped upon these receivers by experienced repair persons and students 
wishing to become experienced repair persons, you would not wonder if you have caused any damage.

You have not wired the antenna input across a set of 220 mains so have not inflicted damage on your receiver.

It may not work, but that is not your fault.

Keep working on it until you get it fixed.

Roger AI4NI