Zenith porthole 12" console

[bandersen]

I have this colorful assortment of what I think are Zenith knobs. If anyone needs some, just let me know.

[Eric H]

I posted a close up of the small knobs some time back in this thread here: http://videokarma.org/showthread.php...enith+porthole

[Eric H]

Are the catches broken on your control doors? Mine was missing one when I got it and the other has since fallen off, they were either soldered or glued on the inside of the doors.
If anyone has a good picture of what they look like I'd appreciate it.

[Adam]

All 3 of my small knobs with the dot are the same, that picture just makes the left one look slightly different. All of the others I posted in that pic have the wrong size hole (too small). The catch on my left door is good it appears to be soldered on, the right one is missing. Here's a pic of the left one.

[John Marinello]

Originally Posted by Adam

Thanks for pulling those out. I have a bunch of the smaller ones in a lighter color. Which controls take the knob with the dot, and which the knob with the edge sticking out? ... Actually, the hole on the ones with the edge is too small, so is the hole in the ones with the longer shaft, so only 3 of those fit.

The shorter knobs look like the ones on my '51. The ones with the tabs were
for the horizontal. There was a small tit that that tab would hit, limiting it to
just less than a full turn. It rotated a slug, rather than a pot.

[baursam]

Well. Its up to you Adam. As I mentioned I have seen consoles with all white minis As you have three it might be easier to locate one of those as opposed to two browns. I'd see if the person who posted. Pic of their console earlier in the thread, can check and see if he has brown or white minis under the face plate. Let me know which direction you decide to go, white or brown

Ross

[baursam]

It soooo kills me to say this...I have a Golden Lab, just over a year old. Beautiful dog, but still very much a puppy. Yesterday, I left the knobs in a ziplock bag on my kitchen counter. Today, I got home from work and found a ripped up bag all over the kitchen and a few of the knobs laying on the floor.

As it stands I am now looking for the same knobs. Grrrr. My fault, I should have put them immediately back on the set afterwards, but got distracted. I have found one mini knob and the remaining 5 I have not found as of yet, but will keep looking over the weekend. The other thing I can do is, go outside with him tonight and tomorrow and keep an eye on things ;-) Its a dirty job, but nothing a good disinfectant wont cure, should they appear that way. Update, he got into the chess set too.

Live and learn.

[kvflyer]

I thought you would say that you found them chewed up. Now, it goes to a different level!

[baursam]

Update. Have found two more minis. Under the couch. At least they are probably just in the house, thus preventing a full on dissection tomorrow

[Geist]

Sounds like another thrilling episode of as the Knob turns..
Thank You Marty

[baursam]

Good one Marty. I feel like such a knob. The good news is after a thorough once over I found the remaining knobs in various places in the house. So everything is back in order. Adam if you are interested in the two brown knobs, let me know an I'll send them out to you for the cost of postage

Width of hole on rear of knob is aprrox 1/4 inch

Ross

[baursam]

the two extra knobs have been spoken for.

[Adam]

I finally started working on my porthole. I thought it was interesting to note a mistake by someone working on this long ago. Look at the resistor in the pic with the arrow pointing to it, it's hooked to the wrong section of the can. What it did (now looking at the schematic) is to connect a 27K resistor parallel to that 20uf capacitor connecting to the tube side of the vertical output transformer. I wonder if this set ever really worked like that. Now I'm going to have to check over the whole set following along in the schematic to make sure there aren't any more similar mistakes.

[bandersen]

Ugh, I hate when that happens. I'm glad you caught the mistake and good luck!

[Adam]

Well, this tv was really messed up. Someone (probably back in the 50s looking at the parts he used) replaced about half the resistors in this set, and often used the wrong values and hooked one end up to the wrong place, sometimes even hooking it around the wire of the old resistor without any solder. He also changed some of the cans (with not exactly the same ones) and screwed up trying to rewire. And a large number of the resistors (both original ones, and changed ones) were bad. Tubes were even in the wrong sockets.

I went through this set component by component with the schematic, and am now just waiting on a order of resistors to get any further. That large 20W horiz damper filter resistor was open among others I didn't have in my parts drawer. I haven't tested the tubes yet either, or put the electrolytics in the power supply chassis. This set's also going to need a lot of cosmetic stuff too (refinishing the cabinet, getting rust off the top of the chassis, new dial cord) but I'm just working on getting it running first.

Here's a pic of what the chassis looks like now, and some of the "classy" work left behind by the last guy to work on this from the power supply chassis.