Very nice set & picture. Nothing like period content to show off
a roundie. I like Bonanza for that.
Anyhows I would live with the vert til it gets worse. Could be
either vert tube slow warming so start with quality NOS tubes.
Next is the one or 2 'lytics in the cathode of the V out.
After that look to the caps in the feedback loop. Since you
are under the chassis change both integrators if they havnt
been yet.
73 Zeno
LFOD !