[sdiy] Hollow low-pressure ladder filter

[harry]

oh YES by all means...use the PENTODES...

I wanna see how you bias the grids  ;^)

H^) harry

Tim Ressel wrote:

> Yo,
>
> My 6AL5s finally arrived. Tomorrow, neurons willing, I
> will bang together a diode version of a ladder filter.
> The advantage is: no high voltage. +/- 15V should be
> enough to run it.
>
> Now for the bad news: the 6AL5s are military tubes. So
> any music mafe with this filter will come out sounding
> like a march  ;-)
>
> More 12AU7s and filament transformers are on the way
> for the triode version. Or should I use pentodes to
> satisfy those ultra-linear purists out there?
>
> --TR
>
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