What is the voltage dropped across the resistor? Being mounted in a metal case attached to the chassis indicates it does dissipate power and will get hot.
FM may require an antenna. Early radios were not as good as modern radios on FM.
Norm
: Hello. I have a Zenith Radio with a 9F22 chassis that has been
: giving me troubles. Their is a 1.8k ohm resistor that is
: mounted in a metal case rivited to the chassis that runs
: very hot. after finding the schematic in the Rider's book,
: I replaced a lot of old caps and resistors that might
: be loosing resistance & capacitance. The 1.8k resistor
: still seems to get hot, and the FM band is coming in really weak.
: I used values same as is shown in the schematics for the
: new components. What might be causing the weak FM? The AM
: band is still strong, and the phono sounds better, but the
: darnold resistor still gets extremely hot.
That resistor is dissipating about 2.5 watts and will be very warm.
Check the grid #1 voltage on the output tube in the radio. It should be negative by 5 to 8 volts. If it's not the radio will distort. It will get worse the longer the radio is on. This is usually caused by a leaky coupling cap from the plate of the previous stage.
Your output tube is most likely 35 or 50C5 and it will be driven by a 19T8.
Norm
: The voltage drop on the resistor is about a 65 volt drop.
: (300v to 233v) I got the FM band to work after hooking up an anntena.
: The set plays fine for about an hour, after that the audio starts sounding muddy.
: Other than aiming a small fan at the chassis,what could
: I do?