Issue with GE "Portacolor III"

[zeno]

OK first give a detailed description of the symptoms, I think I am
missing something here. Do you have a color picture that goes away to blank white when the color control is turned all the way down ?

AGC When there is no signal or very weak signal both the RF & IF are turned on to full gain. With strong signals gain gets turned down. SO AGC voltages
can vary a lot. Most SS sets the AGC control will go from snow to normal
to a jittery pix as you turn it. Set it to where the snow just goes away..

TUNER Most tuner fails are snowy pix or whited out & wormy. Crude test
is turn the channel. You should see "noise" in the pix & crashing in the
sound. If you do the problem is tuner related. If not its IF related.
Keep in mind sometimes tuners get so dirty they stop working unless you violently shake the knob !

73 Zeno
LFOD !