Prefered 300B tubes for Canary Amplifiers

Brf,
One great feature of 300b and low power DHT tubes in general is their longevity, much better and also more reliable than my prior KT 88 and 6550 tubed amps(won't go back to that).Unless you have an amp that really pushes the tube, most should get many enjoyable years from their 300b.What is the operating point and watt dissipation of the Carnary circuit. Maximum dissipation for the 300b per WE standard is 40 watts.It would seem a push pull circuit should be easier on the tube since the driving is shared among the tubes (one pushes and the other pulls)as opposed to the SET where the tube responsible for the full cycle.I certainly could be wrong.
Regrds,

One reason amp manufacture utilize 300B's in PP configuration is to achieve more power. Since power is the objective, most 300B PP designs run the 300B at their maximum limit. That’s the general consensus, but as always, exceptions to the rule exist.

Based on the WE300B spec sheet, they should last for 40,000 hours. Remember, the 300B tube was developed to amplify telephone signals back in the late 30's.

The original WE specs predicted 40K hours as Brf said.Certainly that figure
will vary based on the brand and quality level of current tubes and how hard
that tube is stressed in a given amplifier. The Takatsuki is reportedly
constructed to a very high tolerance level (strict adherence to original 300b
specifications) with premium materials, only time will tell.When I got my
amp I asked the builder Israel Blume how long would the tubes last.He
replied that the amp is very conservative and easy on the 300b and they will
last for years(only 25 watt dissipation).Gary do you happen to know the
watt dissipation for your amplifier? The lower the number generally the less
stress on the tube.Maybe SET circuits are easier on the tubes, I really don't
know.
Regards,