[sdiy] bottle ladder filter

[Paul Perry]

At 08:37 AM 21/04/02 -0700, "John L Marshall"  wrote:
>Heater to cathode may be as much as 200V peak, negative and 100V DC plus
>100V signal, positive. Your ladder will work upto 200V.
>
Another thing, is you can have half the ladder below ground & half above.
The old analog computers usually had a -150 or -200v rail to make direct
coupling easier.

paul perry Melb Australia