Here is the supply with the Triad C-7X choke in the supply.  The specs say the choke has 270 ohms of DC resistance but I measured 235.  Ripple on point A is now down to 2mV.  Actual voltage at point A drops to 343.6 in the simulation.

OOPS!

I didn't put the correct secondary power transformer winding resistance in the impedance calculator in PSUD so the correct impedance for the recommended transformer is actually 46.91 ohms instead of what I have in the previous posts.  It makes very little difference in the simulation but I figured I'd let people know if they're trying it on their own.

Okay, I've got the amp wired with solid state rectifiers, Triad C-24X choke and the separate properly center tapped filament transformer.  

Upon fire up there were no flashes or puffs of smoke so that's good.  There is very little audible hum unless you put your ear right up against the speaker but it is not completely silent.  Before the choke was added you could easily hear the hum from the listening position.  I have the choke wired so that I don't have to de-solder anything to change it out.  I'm currently getting 352 volts at point A on the circuit as configured so even with the choke I'm still getting a bit more voltage than I should be.  That's not really surprising since the secondary winding of the transformer is rated for 150mA and the circuit only pulls 80.  

I would rate the sound definitely superior to the way it was originally when I had it with the un-center tapped filament supply and no choke.  The hum was really loud back then and it really distracted you from the music, especially in quiet passages.  Is it better than when I had it with the tube rectifiers?  I don't think so.  I'll have to try it with chokes with higher henry ratings and see if they improve things.  I can say that adding a choke that costs less than eight dollars and a 33uF cap should be a no brainer for anyone building this amp.  It's not the ultimate but it will go a long way towards making the amp more fun to listen to.

Currently I'm running One Electron output transformers on their four ohm taps to an eight ohm speaker.  This is presenting a 7K impedance to the output tubes.  My single driver speakers never drop below eight ohms so I'm going to hook up my Edcor 5K/8 ohm transformers as well, this should give me a bit more power at the expense of a little bit more distortion.

The ohm rating of the transformer in the program is not the resistance but the impedance.  There is an impedance calculator in the program that uses measured input (wall) voltage, resistance of the primary and secondary winding of the transformer and the unloaded voltage output.  

When you right click on the tranformer in the program to edit, both parameters have a button after the data entry box with "..." in them.  Click on the resistance box and it will help you calculate impedance.

The current tap ratings were a guess based on tube ratings.  At some point I will measure the current draw of the small signal tube and subtract that from the total 80mA of current draw.

You are of course right about the capacitors in series.    

Is the R core transformer 250 center tapped, i.e. 250-0-250?

You can use the zoom in and zoom out buttons on the display graph, I zoom out then click and hold on a point to the upper left of the graph then drag to create a box around the area you want to look at.  Doing this repeatedly allows you to zoom in on a very small part of the graph so you can see the actual ripple which can get very small.

You got my attention!  

Can't wait to see those speakers!  

Mike