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

How hard does this amplifier(power output) run the 300b? Are you familiar with amplifiers that maximize the 300b power curve and sound good doing so?

Our circuit puts 500V on the plate. In addition to other circuit design features this allows us to get 12 very clean watts (low IMD and low IMD rise) out of the tube. As the output transformers are specially wound for a Class A3 circuit, we see negligible increase in stress on the tube.

Designer Kevin Hayes has indicated to me and others that a truly WE-spec compliant 300B will have no trouble in these amps. As he has indicated, though, and as "Raquel" has emphasized in a number of past threads, a number of 300B reissues from contemporary sources do not meet those specs, and can turn this particular series of amps into popcorn poppers.

Thank you for bringing this up Al. As a former owner of VAC Auricle Musiblocs I have great respect for Kevin Hayes and his designs. These are the types of tubes that we recommend in our amps as well. The "new production" faint of heart tubes need not apply. If you can't get a nice set of NOS 300B tubes we recommend the current production of the Sovtek 6A3, which is not really a 6A3 at all if you look at the specs. It is reliable and works very well in our circuit.

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