[sdiy] bottle ladder filter

[Tim Ressel]

Yo,
--- Peter M Blackett
<dragonservicing at success4business.com> wrote:
> 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.

Ah, I see you never sleep either. Or are you across
the pond?  Anyhow, yeah, I think you may be right
about the B+. The max signal level is quite low.
Boosting the B+ may help. As for fancy filament
circuits, the first attempt will consist of cheap
little transformers (one per tube??). Once I know the
final B+ value, I'll deal with final heater details.

In the meantime, its lots of fun to pretend I know
what I'm doing with all this valve stuff. I'm bidding
on a copy of the Radiotron Designer's Handbook. That
should help. Having worked with tubes in my youth, I
know a few things. Like don't work on HV when you're
groggy from lack of sleep.

Gosh golly this is fun!

--TR

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