[morzh]

Me I would get some 8 or 10 uF 500V caps.

28uF seems like a lot, I don't know if the inrush current when it fires up might be too much for the 80??

Just my 2 cents and it may only be worth 1 cent.

Always good to have a nos 36 around as the front end can be "fussy"

I thought of that, but then the 80 sch calls for 8uF and 4uF caps, and in the real chassis I have there are two 16uF caps, factory-installed, so I thought they did not see much difference at the factory (I assume they tested that arrangement before releasing it to the unsuspecting public .
Also, the tube inrush is different from the solid-state diode inrush. With solid-state it is the voltage that exists at the moment you plug it in the outlet, that may be at its peak for all we know, that gets rectified immediately and applied to a cap, getting effectively shorted and limited by the ESR/ESL of the cap itself for the peak instantaneous value, since the dV/dT is huge.
With the tube, it takes it some time to get fully conductive. It rubs its palms, blows into them few times, jumps a bit, warms up and then slowly starts charging the cap.
So maybe this will save my behind.

Then, nothing prevents me from serializing three of the caps and making an 18uF cap out of them. They will fit just fine. And I have lots of samples