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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?
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