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The lower of the two listed "typical operating conditions"...

is 300V @ 62ma. That looks fine to me and is likely close to what WE actually used in amps they designed back in the day.

That would equal a plate dissipation of 22.2W which is very close to 5/8 max (35W X .625 =21.875W).

About a 5 watt amp after transformer losses and a WE 300B would last for a long time at that dissipation rate.

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