its probably a hotel set. Even looks like one. Usually there is a tag on the back
that says " no labor warranty". Model number will also reflect it MOST
of the time. IIRC E & F line sets only had coax on varactor tuner models.
Since its an E line it would have come with plug in IC's & transistors.
Pull & clean the 4 transistors on the 9-89. Do the same with the 2 IC's
on the 9-86. You can do a little pushing to see if it acts up.
Since it seems to only happen with signal I bet its on the 9-86.
73 Zeno
