[TenTec] Omni VI- PBT jumping after warm up.

[k8vf_mark at centurytel.net]

"Its thermal. Could be an almost soldered connection, a connector, or
inside a chip or transistor.

You need a freeze mist and some warm air (hot air gun or hair dryer).
When it changes go cool a section. Then warm it, doing a binary chop
(cutting the area heated and cooled each time) to isolate it. You may
even get it down to the connection or device with the problem."

Yes, I figure to look in the area of the D5 varactor, thinking that the 
voltage was being varied to it, causing it to shift.

Any other ideas are MUCH appreciated. I am not well experienced in 
troubleshooting electronics but if you have a Steam operated pump or engine, 
or a coal stoker I may be able to help.  ;-)   Mark