Quote:
Originally Posted by orbanp1
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On the other hand, a quick simulation of the circuit shows that the pentode plate dissipation exceeds the max listed value, but that could be because of an "imperfect model" of the tube.
The model I used was from the Duncan web-site.
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I did find another set of SPICE models for the ECL82, this time by Ayumi Nakabayashi.
The plate dissipation is still excessive, about 14.8W, while with the Duncan models the dissipation is 15.7W.
So it looks like the tube is indeed stressed in that application.
The RCA datasheet quotes the max plate dissipation as 5W, if the plate voltage is more than 250V, and 7W if the plate voltage is below 250V.
In the simulation, with 370V supply voltage, the plate-cathode voltage is about 330V.
Regards, Peter