How hot is a class A pentode?
As pictured, it is 6n14p pentode at 12.5 watt dissipation, class A biased at 50mA/250Vplate. It can reach 200 degree CELCIUS inside (cathode) !!!
Outside, there is still glass cover and vacuum in between, so the heat transfered may only be the radiated one.
How hot is the glass tube? I have no idea, but smelling the heat on the air surrounding it, well, just DO NOT touch.
Let it glow..
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