Quote:
Originally Posted by Phil Nelson
Looks good so far. The emissions woke up quickly when I left it on the tester for a few minutes. Below is a snapshot after I had done nothing to the set except adjust some color controls and replace caps on the vertical sweep board to fix some instability.
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html |
My OWN experience has been that a good majority of roundie tubes are either good when we get them, or they "wake up", pretty easily and then they work great. A BIG exception would be the "really old ones" like the 15G and 21AX--which tend to go to AIR--even if the cathodes were over 90% new--before they go to air. But the all glass ones with frit-bond seem to hold up pretty well--even OVER 50 years later.
But then again...I have my 29JC20 set with a BAD 21FBP22 and it is NOT gone to air--but the red gun is pretty weak and will NOT restore...though it WILL show a fairly good result at about 7.5 volts on the fils.