At 23:41 03/02/2000 +0000, you wrote:
I note the comments on faulty filter capacitors with interest. Not
certain of details of the transmitter responsible for the "Growler"
on 73.3kHz but if it's a) High powered
b) Valved
c) Old
then it may well not have any! it not being unknown for them to rely
on inductive smoothing (plus "stray" capacity to ground) for the
reduction in ripple on HT (11kV+)
As the power is quite high, there is also the possibility of
feeding the power supply from a 3-phase source. In this case
no capacitor is required and an inductive filter is ok, until
one of the rectifiers or one of the 3 phases fail. Then, you
get a 50 Hz component which cannot be filtered easily.
Costas
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