I’m Back! Pilot TV37

[Chris K]

Originally Posted by Chris K

OK I figured it out and the ballast is fine...Pin 1 to 2 is 10 ohms, pin 2 to 3 is 10 ohms and pin 4 to 6 is 460 ohms. That looks correct on the schematic

Well crap, I did it again! I need to learn my lesson with these ancient TVs to go slow and be conservative. I had a picture and was moving along fine and then started replacing components like crazy, didn't stop to check function between 2 or 3 parts, and now I have replaced most of the resistors and caps and I have nothing. A couple of days ago, I powered it up and a 3 ohm resistor that drops voltage from tube to tube in the filament string between the 6AU6 Ratio Detector Driver and the 6AL5 Ratio Detector essentially blew up. The 6AL5 is actually the last tube before the ground in the string on the negative rectified voltage side. But long story short, I'd like to go back to basics and start measuring voltages from jump. The problem is, when powered up, some of these tubes appear to be red plating. My guess is it's excessive filament voltage because parts of the other string are not lighting up. I have seen in a standard TV with a standard CRT, you can pull all of the tubes except for the HV ones and start from there to see if you can get power and then a raster but an electrostatic CRT television is something I haven't dealt with before. I want to be conservative but I don't know where to start the troubleshooting process and I don't want to power the chassis up and sacrifice tubes that are burning hot. Any suggestions as to where I can begin a basic troubleshooting so I can find where I screwed up? I've probably done the wrong thing here and uploaded the radiomuseum schematic. Help!...again!