Chebby,
For info
The Napsc is "upgrade 1" - this is an 18v supply which provides power to the non signal parts of the Pre Amp such as volume control motor and fascia display. The NAPSC is an optional (essential) upgrade on a 202, it comes bundled in with the 282
When a NAPSC is added the signal power to the pre amp is still fed from the power amp.
Result is an improved seperation and much much clearer sound.
The HICap2 (been called this for around 10years) is "upgrade 2". The HiCap power the Pre amp signal path allowing the power amp to concentrate purely on power. The NAPSC still powers the 18v but the HICAP powers the rest. Dynamics, detail and sounstage are all markedly improved. It also allows the torodial transformers in power amp and power supply to be as far removed physically as possible from the delicate signal path.
All in all job done, sounding lovely.
Now MA GS20's or PMC GB1i or Spendor A5...................................(joking)