Philco Predicta 9L37 chassis horizontal output tube red plating.

[Electronic M]

Pull the top lead off of the H output tube and check the grid for the proper waveform with an oscilloscope, and also do voltage checks.

Replacing just the electrolytic type power supply caps is not enough to safely run a tube set. You need to replace all the paper dielectric type caps as well or the set will either not work or is left as ticking time bomb counting down to failure and possible destruction of other (often unobtainable) parts.

[Dangler]

I don't have a scope anymore, I sold pretty much of all my test equipment when I retired from the repair service. About all I have left are some digital and analog VOM's and a cap checker. Looking at the Sam's, it looks like the grid of the horizontal output tube is connected by a 3,300 mmf cap from pin 6 of the 6CG7 horizontal oscillator tube. Am I on the right track? Also, would 3,300 mmf translate to .033 uf ? I'm going to check it in a couple of minutes. Thank's for the help so far. Dan.

[DaveWM]

that cap is not a discreet part, but rather built into a couplate (a part that has all the resistors and caps built into a ceramic looking package.

I would 1st try recapping the paper caps as that needs to be done anyway.

Then I would check the voltage at the grid of the horz, should be neg, 30-50v, if not then either the horz is not working OR the couplate cap is leaking.

Some folks have had those couplate go bad, i have only worked on a couple predicta's, they were fine.