question to Plinius Amp owner

Thanks for the responses !
Let me try summarizing and adding as follows:
1. A well designed class AB is still not as good as a well designed class A, looks like the difference is not trivial
2. the above might be applied to dynamic biased class A
3. based on my experience, it takes 45 minutes to 1 hours (depending on the environment temperature) for Class A amp to reach the thermal equilibrium where it is designed to operate at.
4. "always on" might not be appropriate unless you do not pay the electricity bill

always on AB class. No big bills !

UPDATE: I leave my amp on class AB, 24/7. When I flip it into class A, it takes a good 30 minutes to really stand out and become very dynamic.

In class A the sound is slightly more palpable than in class AB thus rendering the music to be more enjoyable to listen to. However, in my findings, extensive and prolonged listening sessions in class A will render the sound quality to be almost similiar to class AB when switched back to AB. Hence in order to appreciate the benefits of class A over AB, I mostly listen in class AB and only switch to A when I am really into the mood for some critical listening session.

I have a Plinius SA-102 amp purchased in 2003. Class A mode makes a lot of difference specially when kept on for one hour.
Caution:
Few weeks back, I observed that the heatsinkls were not as warm as it used to be earlier in Class A.
Please note that over a certain period of time after usage, "Bias" voltage may come down and need re-adjustments. If you feel that the heatsinks are not getting enough heated, then consult your local dealer for re-adjustment