[sdiy] bottle ladder filter

[John L Marshall]

Heater to cathode may be as much as 200V peak, negative and 100V DC plus
100V signal, positive. Your ladder will work upto 200V.

Take care,
John


----- Original Message -----
From: Peter M Blackett <dragonservicing at success4business.com>
To: Tim Ressel <madhun2001 at yahoo.com>; synth Diy list
<synth-diy at dropmix.xs4all.nl>
Sent: Sunday, April 21, 2002 1:21 AM
Subject: Re: [sdiy] bottle ladder filter


> Dear Tim,
> that seems like a most interesting project !
> but I think you may need more that the 100 volts ht for the circuit to
> work correctly.
> But I know that means using a more complex heater supply as I think the
> heater cathode insulation of the tubes [valves ]  may only be able to
> stand 100 volts or so .
> so you would need at least two heater windings ,not at ground potential.
> regards Peter
>
>