Will said:
"It takes up to one minute + for the heater to reach operating temperature.
A cold heater is only a few ohms, and that's a lot of current."
Although it will take up to 3 minutes for the cathode to come up to
operating temperature, the heavy current draw only lasts a moment. Do not
confuse the two events. Heavy current draw is for less than a second, and I
believe normal current draw is within 2 seconds.
Colin K7FM
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