My motorola vt-71(TS-4H chassis) has verical jitters when it warms up.The vertical control has no effect on the jitters.The set has had a full recap and all high value resistors and all ceramics replaced in the output section.I have tried different 6sl7's,all were good.I have also tried different 12sn7's, all with the same result.
Any ideas????

BTW- I did not use any ceramics for the coupling.