[R-390] R-390 non A 12khz jump

[Tisha Hayes]

I would suspect a capacitor in the PTO circuitry that is on the verge of
failing.

A can of freeze spray may help you isolate the specific component; Maybe
even tapping on caps/resistors with the tip of an insulated tool might help
identify if there is a cracked component that works differently.

The ballast tube would not be so 'precise' in causing a 12 KHz offset. It
is also a very simple thermonic device with an iron filament in a hydrogen
atmosphere that is just a current regulator.

*Ms. Tisha Hayes, AA4HA*

"*We live in accordance with the flow of the times*"
-Yoshio Mizuno