24 inch Muntz restoration has begun

[ohohyodafarted]

Originally Posted by Dave A

Or does this thing need a massive amount of RF to be stable?

Dave A

You may have something there Dave. When this chassis was on my bench here at home using a 5 inch test crt the darn thing seemed to be very stable. In conjuction with the above, you should understand that I live in the middle of where all the Milwaukee transmiter towers are located. I am less than 1 mile from no less than 6 1000 foot high transmiter towers with several stations per tower. The signal here at my home has always been way overloaded. It bleeds into everything.

Today when I installed the 24 inch crt, it was at my workshop at the factory where I work. That location is about 3 miles further away from the towers, and the signal is noticably weaker at my workshop.

Perhaps I should try and feed a DVD player into the set and see if it is stable that way?

But even if it is a mater of weak signal, I would have to think the set needed to perform better than this when it was delivered. Otherwise nobody would have been able to watch the thing under normal signal conditions.

Going to try some more tubes tomorrow before removing the big crt.

Thanks for all the suggestions,
Bob

[wa2ise]

Originally Posted by ohohyodafarted

In conjuction with the above, you should understand that I live in the middle of where all the Milwaukee transmiter towers are located. I am less than 1 mile from no less than 6 1000 foot high transmiter towers with several stations per tower. The signal here at my home has always been way overloaded. It bleeds into everything.


Bob

That's about the only place a Muntz TV would get decent reception.. :-)
"Mad Man Muntz" designed his TV sets to be super cheap. bare minimum of an IF strip, for one thing. He'd often go into his development lab and randomly snip out resistors and caps to see if the set could do without.

Later on, the FCC mandated minimum performance standards for TV sets.

You can back off on the height a little. As the cabinet masks off some of the top and bottom of that roundie tube.

[ohohyodafarted]

Originally Posted by wa2ise

You can back off on the height a little. As the cabinet masks off some of the top and bottom of that roundie tube.

I will do that, but unfortunately there is no provision to reduce the horizontal width, and when you reduce the height, round objects in the center of the screen become oblong left to right. Got any suggestions to reduce the width. it is at least 4 inches wider than the actual crt. If I move the lateral control on the neck of the tube, I can't even find the left edge, although I can find the right edge of the picture.

[Old1625]

Nice job on that very pretty Muntz. The picture you show is probably about as good as it'll get. Does that set indeed have 3 picture IF stages? Most Muntzes I've encountered only had 2. Sensitivity and bandwidth converge at very poor compromise.

Also sync circuitry was minimal. And forget about keyed AGC.....

Not sure what to tell you on the horizontal oversweep issue. If you do take steps to try to reduce the amplitude keep a sharp eye on your HOT cathode current, lest it exceed tolerable specs.