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RE: How rugged are vintage 2A3 tubes?

"because plate dissipation is much more complex than simple plate area and cathode power"

Indeed, because the heat must be transferred by radiation the glass bulb area is also important and the transparency of the glass for IR is also of influence.
For a little bit more money any electron tube could be a lot better* by using a better glass bulb.

* longer life by cooler temperture

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