[compucat]

Originally Posted by bandersen

The capacitance of a ceramic cap varies with the applied voltage causing distortion in the sawtooth waveform. It's really not noticeable in the horizontal but may be in the vertical.

More info here: http://www.antiqueradios.com/forums/...c.php?t=119878

When I first restored my 9VT1 I used ceramic caps to replace the high voltage caps as that was all I could find and I did not know wehere to get the tubular ones. They worked fine except for the vertical. I could not get proper linearity until I doubled up the caps in the vertical circuit. It had me stumped for quite a while. I eventually replaced the ceramics with tubulars and would not attempt to use ceramics again in this application.