[drh4683]

Your space command chassis shouldnt be causing any of your symptoms. Unfortunatly I dont have a schematic for 1958 zenith line. I will assume you have space command 400 in there. Basically, your speaker output lead connects to the space command chassis and is stepped in 3 incraments by adding resistance in series with the output. Feel confindent that this is not causing any of your sound problems, as if a resistor were to be open, you would have nothing from the speaker. When you move the selector switch on the space command chassis to manual, you also are disconnecting the sound input to the space command chassis and passing the output through the switch. The space command chassis is totally independent from the tv chassis. In other words, the space command chassis does not supply other circuits within the TV chassis a supply voltage etc.

A pointer for your vertical problem, yes, capacitors are generally prime suspects however high resistance resistors will go way off value and cause minimal vertical sweep. Trace the wire that connects the vertical lin pot back to the vertical output tube, there is probably an 82K or some sort of higher value resistor in series with that. If your resistance doesnt seem to be at all of what it should be double check by clipping one lead off that resistor and check again. Keep in mind your resistors should be within a tolerance of +/- 20%
From experience with many sets, you only will need to replace the black beauties and nothing more (as far as capacitors go). You will be surprised how much resistors change value, in perticular anything over 1Meg.
Should resistors in the described circuit be ok, I will go deeper into details. Just want to avoid unessisary confustion

By the way, does the space command chassis work? Any space command remote will make it do something, either a 300, or 600 will work if youve got one lying around. All space command sets using the mechanical remotes use the same fundamental frequencies. Space command chassis will always need to be recapped, as they use about 7 or 8 black beauties if its a 4 function remote. We'll focus on that later. Ive got alot of experience with space command circuits, shouldnt be a problem if there is one.