Also, are you aware patlaw that with your cap setup on the first stage you are now at 25uF 900V for the first cap section?
So you have less than the 30uF in the stock Sunn that was already less capacitance than it should have been.....just sayin!
Yes, there is a little bit of a story there. When my brother recapped this amp many years ago, he used high value photocaps for the first and second caps. When the amp turned off, it would oscillate for a second or two. In replacing the caps, I wanted to make sure not to go too high.
The original Sentura II schematic, which matches my amp, has the first cap at 30 uF. The mid-boost version of the Sentura II, which is presumably a subsequent design, has the first cap at 20 uF. Considering that the value may have been lowered for a reason, and after reading a number of recommendations not to put more than 20 uF after a GZ34, I decided to split the difference.
So far the power amp is working perfectly. With capacitor tolerances what they are, I could actually be closer to 30 uF than 20. I didn't measure it. If I need to add more capacitance, such as would be necessary if I changed to a solid state rectifier, there is room to easily add bigger caps. The amp just sits at my house not being used regularly. (My regular amp is a Fender Vibrolux Reverb.) Even then, I don't play a lot.
Does my thought process make sense?
EDITED TO ADD: I just read back through this thread. When I posted a link to the can cap at Tubes and More, I posted the wrong link. My question actually applied to the cap at the link you
posted. That's the one I meant. I didn't realize the they even had a 475 volt version.