Please Help ID Space Command Parts..

[Tubejunke]

Originally Posted by Findm-Keepm

Have you checked the B+ circuits in the set? An open input filter capacitor would yield low B+ and the symptoms (Low/No Vert sweep, 120Hz hum in audio) you describe would be the result. The input filter cap is going to be a two or more section can capacitor, usually rated at more than 350V.

I'd start by measuring the B+ feed to the vertical circuit, and trace it back to the power supply if it is low.

Cheers,

No, I have not checked the B+. With the set recapped and strong sound (hum) and high voltage, I (stupidly perhaps) took for granted that all of that was OK. Again, the set performs exactly the way it did coming through the door, with all new caps. I do understand that new parts are no guarantee that everything will perform as expected. Whatever the problem is, it existed when purchased, and continues to exist, regardless of new caps and several new resistors.

The reason I ended up in the video section is that I was combing all of the circuitry looking for misconnections, solder splash, checking resistors again, the whole routine. That is when I found that the black item in the first picture bearing a green dot was open. Still nobody has said what it is. I feel like it is the L5 or L6 coil. No matter what it is I know that it should have some measurable resistance (not open). This will probably be more of an issue once I get the big issues tackled.

This may sound stupid, but they say that there is no such thing as a stupid question. What is a good method of checking voltages on a chassis that has been disconnected from the tuner, speakers, and CRT. First, I fear that something could be damaged operating a chassis like this. It could be dangerous to ME if I don't disable the HV, or at least more dangerous. This all leads to my second fear that any measurements taken might be off with so many things disconnected. I already know that they made a universal test CRT that can still be found. Right now, I don't have this, as I'm sure many of us don't, but we still must check voltages. I know I could remove that large CRT and rig up a bench mount of some sort, including the tuner and speakers. That sounds pretty far fetched to perform a fairly simple procedure. Any ideas or advice would be great.

I love the sets from the 50s that the chassis is removed complete, with the CRT.