I recently had a Universal 446 that had a bad capacitor (1), it degraded within just minutes and the lamps barely glowed on it. Today, I happened to try that ballast out just to see what it would do with two F34s and it works perfectly! After the lamps warmed up, it has no flicker or anything. The ballast is working completely normally again...
(1)
https://www.lighting-gallery.net/gallery/displayimage.php?album=8528&pos=7&pid=266502