Is there any 50W 300B SET monoblock out there?

Al,
Raquel, now that's a name from the past, I always found his comments interesting and informative. What I don't know is this, SET vs push pull circuits, is one inherently "tougher" on tubes than the other? Or is there a wide spectrum in terms of stress/demand with either topology that's the overriding factor?

Clio09,was the version of your SET I heard(CES) using NOS W.E.300b or a current production 300b?
Charles,

The Wyetech Rubies sell for $29,990 direct from Wyetech. The $67k quoted above is a suggested MSRP, closer to what an amp of that quality might sell for after the typical dealer and distributor markups.

I don't believe it runs push-pull, since no phase splitter is employed.

Charles, it was using the Sovtek 6A3 which is the tube that comes stock with the amp. The driver tube was the 6ER5.

09-03-14: Charles1dad
What I don't know is this, SET vs push pull circuits, is one inherently "tougher" on tubes than the other? Or is there a wide spectrum in terms of stress/demand with either topology that's the overriding factor?

As you realize, Charles, there are obviously a great many design dependent variables involved. But I suppose that there is probably a loose/partial correlation between SET and greater stress on tubes, due to the fact that SET designs (or at least conventional SET designs) of necessity operate with Class A bias (thereby consuming lots of power at all times, relative to the power capability of the amp), while of course many push-pull tube designs are Class AB.

Best regards,
-- Al

Al,
You cited your VAC 70/70 amp as an example of a near max operating point design using the 300b in push pull. My amp's builder purposely chose conservative OP parameters for long tube life and sound quality despite it being pure class A bias. So it just makes me wonder which approach puts the tube under more stress in daily use.Just curious about these things.
Charles,