Quote:
Originally Posted by Notimetolooz
First off lets get your terminology correct, the silver coating in a tube is the "getter". It is a deposit of a metal that will grab any trace of oxygen in the tube. Sometimes it is silver, sometimes it is grey, it depends on how quickly it was deposited. When the getter starts to turn white it means there is too much gas in the tube for it to handle. The cathode is a very small cylindrical metal "can" shape with a small spot of white cathode material on the end. It is all but completely impossible to see from the outside.
An impedance mis-match would not cause hum.
Pulling the CRT base off is a rookie mistake. I'm sure you know how hard it is to find good CRTs today. Always hold the base with one hand and the socket in the other when separating the two. I think that at least one person on this forum has posted about re-connecting the base. I'm sure Phil Nelson of Phil's Old Radios had to repair one that was already loose. Generally you remove most of the old cement, clean the glass and base well, solder on extension wires to the one still on the tube, and remove all the solder inside the base pins. With the longer wires it is much easier to feed them into the socket. The original cement used a mixture of things like water glass, marble dust, shellac, etc. which is hard to find. Many people use "electronic safe" silicon sealant, (it does not smell like vinegar).
In fact Phil has a restoration article about a similar set.
https://www.antiqueradio.org/zen28.htm |
Ok, I apologize for using the wrong terms for the parts inside the Picture tube, I was going by what I was loosely remembering Shango066 say about how he could tell if a picture tube was low or high hours which I guess I remembered the terms he used wrong.
As for the picture tube repair there's a lots of wire left so I should be able to fish the wire through (the wire leads didn't break off they just more or less slid cleanly through the holes in the tube base pins because there apparently wasn't much solder on the tube base pins.