Reverb Tank Issue

[Vild]

If anyone happens to know much about reverb tanks I could use some help. I have an Ampeg vh140c with what seems to be the appropriate spec reverb tank. 4bb3c1b

I've tried it both ways and smacked the tank and both sides sent audio which should mean both half of the tanks are working correctly.
I've tried both cables going straight from the in and out to check the cables and turning the reverb knob and they both work. By testing it that way it does some phasing stuff to the sound which means the amp is definitely sending AND receiving signal through it as well.
Yet somehow it doesn't work when I actually play through the tank.
It just makes no sense to me.

 

[Vild]

Put a 100uf capacitor in series with the signal coming out of the "reverb send" jack. Probe that output with the clip on the scope probe clipped to metal on the chassis.

Then send a 0.5V sine wave into the amp input and see what you get. If it's distorted, turn down the amp gain and see if it cleans up.

Random screw sticking out of the chassis underneath as ground. Cleans up around 3 for the clean channel gain. Frequency measurement jumps around more though. The 3 khz is basically an arbitrary measurement with how much it jumps

 

[Vild]

Mustard and ketchup

 

[Vild]

On the reverb tank my multimeter measures it as 24 ohms input, 201 ohms output, but transducers don't measure accurately like that anyway. Just reflowed it for shits and gigs even though I've checked the connections before multiple times.