So it would seem the amp section of my B60 (having been upgraded to SST) can only be improved upon if I were to get a new amp with SST2 or cubed. What about the preamp section? Given the age of my B60, I think it has a BP20/BP25 preamp, which based on what's been posted here suggests that it's not too shabby compared to the current BP6.
So it would appear that the only "upgrade" that might give me bigger bang for my $$ is maybe upgrading the needle of my turntable from the OM10 to say OM20? Anyone care to comment if that's good value? I have no plans to change speakers or CD player at this time.
If I may be allowed to clarify something.
SST2 was ah upgrade over SST in that it reduced the crossover distortion which is what typically happens in class A/B amplifiers using multiple pairs of transistors.
Since B60 SST did not have multiple pairs of ttansistors but rather one pair per channel, it never received this upgrade nor did it require one. This was clearly explained by Mr. Tanner some years ago.
Furthermore, the difference between SST2 and Cubded is in the input stage, the latter using a patented circuit developed by Bryston and Mr. Salomie. This circuit is not present in BP-6 or BP-26 preamps and is not present in the B60 SST which preamp section is based off of BP-6.
If I were you, I would not bother upgrading the amplifier, it makes very little sense to do so because the benefits of a more recent amplifier would be questionable.
Also, let me say a little about the Rega Apollo. In my opinion, Rega is one of the few managed to create something special with the Wolfson DAC chip. To this day I still think Rega's top end is truly world-class, regardless of price. A proper top end is especially difficult to do on restrained budget and it is what usually differentiates good from exceptional digital audio source. But Rega does it in spades. I am happy for you.
Hope this helps.