Ok. Let’s try this again…RCA 9TC240 Alignment

[Penthode]

Let's get back to the discriminator response. The results you are getting are poor. The noise with lack of the S- curve means something is wrong.

It is difficult to diagnose via this forum. However the noise and the lack of an S- curve suggests the 6AL5 may not be conducting. Check to see if the tube is lit.

A common fault with this chassis is the 5.1ohm series filament resistor which goes open. Can you check this first?