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The cathode voltage of the PI driver is wrong. You must have something wired wrongly. Go back and triple check everything carefully, and test the circuit for connectivity with your Rmeter. You should get ~1k5 between the cathode and the chassis.
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Building a better world (one tube amp at a time)
"I have never had to invoke a formula to fight oscillation in a guitar amp."- Enzo -
I get ~1k5 between cathode and ground. From what I gather all voltages appear to be somewhat low. I'm going to see if I can dig up a more appropriate PT. In the mean time I'll keep rechecking.Comment
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As Tubeswell says, you voltage at V2 pin 3 is too low, fix this first. you sgould have arounda volt there.
Changing PTs won't address the problem. Again, as Tubeswell states a different rectifier would be a simpler solution than changing the PT.
How did you get on checking grounds & layout?
Some pics would be really helpful, 5E3 can be very picky regarding layout.Comment
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