Modifying a Coincident Dynamo Mk1

@imhififan to the rescue again, thank you!

So Im still trying to understand if/what can be gained from increasing the two Epcos caps? Also can someone please confirm their respective name and role in the amp (some call the input supply, others power supply etc). If I understand their voltage ratings add up and the uF rating in this case is only half of the first caps value, being 11uF correct? This could leave room for a larger rating since the 5AR4 could endure more?

As for the other single large cap, 470uF 500V, what is its role, what can it improve and is this the reservoir cap (any other names for it?) that @noromance suggested could be doubled if it does not impact the choke rating? 

Thanks for your patience guys.

If I understand their voltage ratings add up and the uF rating in this case is only half of the first caps value, being 11uF correct?

Two identical capacitors connected in series will double the voltage rating and halve the capacitance value.

Two identical capacitors connected in parallel will have the same voltage rating and double the capacitance.

As can be seen from the picture, these two 22uF 500V capacitors are connected in parallel, so the effective capacitance is 22+22=44uF.

Do not increase the capacitance of the smoothing caps immediately after the rectifier. The charging current will damage the rectifier tube. The 470ųF is the reservoir cap.

Increasing reservoir capacitance may give you the increased bass and mid bass you're looking for. Film bypass caps on electrolytic reservoir caps good for bass articulation. The other mods you've done or contemplating doing don't really change the quantity of bass. 

Something to consider is you can always remove expensive coupling caps when selling or moving on from this amp, use them in another project,  .47 and .22uf are common values. In my current custom build 300b mono SET's I bypassed PS caps with Duelund's silver bypass cap, Duelund CAST tin coated copper coupling caps and Texas Components TX2575 resistors in signal path. This along with top flight tubes made a huge difference in resolving/transparency capabilities. I experimented with the VCaps and Audyn True Copper Max, CAST won out. Jupiters are very nice for coupling caps as well.

Thanks guys for all the useful insights and navigating the parts! So basically I could increase the reservoir cap by how much and remain on the safe side? I saw on the Mk2 Dynamo that the reservoir caps are two 1000uf/315V and I assume you cannot just slap these units on the Mk1 and get good results, but would putting another same cap in parallel to mine be possible or should I try one bigger cap?

Heres a picture of the Mk2 showing reservoir and smoothing caps.

https://ibb.co/R7YJVdg