Bob Maser wrote:
>Can anyone tell me what good is it to have one of those cone heaters in
>series with the primary of the plate transformer? When the cone heater is
>in the circuit, the secondary voltage is 2800VDC and when it is shorted out,
>it is 3000VDC. Hardly seems worth the effort. The cold resistance of the
>cone is ±30 ohms.
All the good happened in the first two or three mains cycles, when the
resistor limited the surge current to less than 8A (<240V / 30 ohms).
By the time you can see anything on a meter, the surge is over and the
resistor can be switched out.
--
73 from Ian GM3SEK
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