K5881 confusion

[davew]

I bought a K5881 amp off Ebay recently and the printed sheet describes it as a MKII which runs in class A. However, the schematic sheet describes the circuit as K5881 push-pull. Isn't that class B?
I'm no expert but the diagram(which matches the amp wiring) looks to be class B with the 2 O/P valve anodes feeding either end of the OPT and what looks like a phase splitter ECC83. Was there also a single ended K5881 - two valves paralled?
Anyway the amp sounds great - what would you suggest as simple component upgrades? Maybe the imput 0.22mF input and 0.47mF coupling caps?
How about the decoupling electrolytics. Would they benefit from an upgrade?
Thanks
dave