I have a RCA CTC-148/148 chassis, Model 26100AK, May 1988 with a sound
problem. The +24.9V feed to the audio output IC is at +24V or so at
very low volume but falls to as low as 3V as the volume is turned up.
Obviously very distorted sound at all but the lowest volume levels. It
is fed from a solid +24.9V source through resistor R1905U. I cannot
read the value or the markings on the resistor as they are too faint.
The resistor reads approximately 550 ohms out of the circuit. My guess
is that it should be down in the tens of ohms at most since it feeds
the entire audio output circuit. Does anyone have a schematic of the
CTC-148/149 with the resistor value? I hate to shell out the cost of a
whole photofact for a set that old.

TIA,

H, R, (Bob) Hofmann