Re: Philco Mystery Control

My understanding is that the filament voltage is applied as soon as
the dial is moved off the stop, giving the tube time to reach
operating temperature by the time the dial is released. Only the plate
voltage is pulsed.

I also seem to recall that the filament is slightly over-voltaged to
shorten the warm-up time.

Norm Lehfeldt

On Wed, 3 Dec 2003 08:06:43 -0800, "William Sommerwerck"
<[EMAIL PROTECTED]> wrote:

>Two questions...
>
>The 30 tube's filament could really warm up and cool down fast enough to send
>out individual pulses?
>
>I don't see how you got a specific station, unless the stepper in the receiver
>reset itself to its "neutral" position on receipt of the first pulse.
>
>By the way, GE revived this system (in a much more sophisticated manner) in the
>early '60s.