My first amp - a direct coupled 2A3

[Wardsweb]

The ultrapath caps do act as filters by reducing AC potential between the plate and cathode of the output tube. They should be seen as filter caps. Notice the large values of inductance employed in the high voltage filtering of this amp. This allows for smaller filter caps of higher quality.
As regards the high voltage to ground AC filtering of the final cap stage, it is completed through the ultrapath and cathode bypass capacitors together. The final choke in the high voltage supply blocks audio signal from the output circuit from traversing the prior filter cap and the other channel. This is to compartmentalize the different stages of this circuit and avoid the "smearing" effect which can be a complaint when two caps of different characteristics are in parallel, such as an electrolytic bypassed with a polypropylene. It also improves stereo separation.

[Wardsweb]

After a couple of final tweaks to get it dialed in, I got .33 ripple at the first filter cap and 2mV at the speaker terminals. Not the best amp money can buy but I'm real happy with my first endevor to the tube amp world.