In message <027901bf9341$882bea80$6e1e86d4@oemcomputer>, andy howard
<musica@UKONLINE.CO.UK> writes
>I'm digging back a long way in the memory vault here so I could be
>wrong, but ISTR that many old TVs had a line output valve that used
>600mA heaters. In this case the other valves were arranged in a
>series-parallel config to make the whole heater chain 600mA.
>Dunno if your Ferguson was designed like this though.

No, the heater chain was 300mA (and was in almost all European TV's -
I've never seen a 600mA one), they used 'P' series valves like 'PL81',
where the 'P' means 300mA heater, the 'L' means Pentode, the '8' means
B9A base, and the '1' means it's not a '2' :-). Some of the larger
valves had fairly high voltage heaters, in order to produce sufficient
wattage with only 300mA - the PY500 (colour boost diode) had a 42 volt
heater.

>Also the capacitor is almost pure reactance so there's a j component you
>need to consider when calculating the drop.
>
></hazy memory>

But how do you calculate it?.

<equally hazy memory>
--

Nigel.

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