funny voltages on my rocket

[beasleybodyshop]

Creeping up..

Swap PI tube? Remove PI tube?

WAG.. Lift the inout to the PI at the PI, don't leave a wire hanging off it. (antenna) and that still wants to go China Syndrome? Just looking for runaway signal out of audible range, that's all. I am out of big ideas.

Pulled the phase inverter tube entirely. Still wants to creep up.

[didit]

Grasping at what for me is the last straw --- disconnect the power bypass capacitor. Does no harm to remove but really unlikely it's causing a problem.

The only other thing I know of that might be pulling it up is super-hot screens. Earlier measurement suggest that's unlikely too.

Best ... Ian

[cbass]

Are you positive these tubes are good ?tried them in another amp

No voltage on pin 2 with the tubes out?
Really sounds like a couple of leaky tubes or bad coupling caps or some kinda crazy supersonic oscillation

[beasleybodyshop]

Put a tube rectifier in - voltages go down, cathode voltages seem to hover around the 9.6 mark. Still have a weak output. Here are my voltages for everything. Phase inverter is showing high voltages - what does this mean? Ive swapped in a few different PI tubes with the same approximate voltages.

[M Fowler]

Has to be wrong value resistors in that PI circuit. I've done that a few times myself.

[martin manning]

Check all of the solder joints, grounding, and resistor values around the PI.

[cbass]

In your picture the plate resistors on the pi look wrong what do the measure

[beasleybodyshop]

In your picture the plate resistors on the pi look wrong what do the measure

plate resistors are 100K

[beasleybodyshop]

All my resistor values in the PI match up - plates are 100K, shared cathode is 1.18K going into a 46.4K to ground. Grid resistors are both 1Meg.

[cbass]

Hmm the color codes don't look like it but if you measured them then they are.

[cbass]

Are you sure they aren't 100 ohm

[M Fowler]

Most likely the 1k2 PI bias resistor.

The 47k tail resistor is going to ground correct.

[beasleybodyshop]

Are you sure they aren't 100 ohm

Hot damn. I should give you a cigar! They are 100ohm.

[M Fowler]

I told you so.

I refuse to let Cbass get the credit.

[Reeltarded]

YOU DICK!!

lmao not you Mark...