[sdiy] tube ladder

[harry]

Plywood makes a poor ground plane... I'd avoid it. Possible fire hazard...
but not a major one...

H^) harry

media.nai at rcn.com wrote:

> At 1:08 AM -0700 06/22/02, metasonix at earthlink.net wrote:
> >
> >>Can a VCF be made with variable mu pentodes??
> >
> >yes, in fact any device having control grids can be used.
>
> Any reason why it hasn't been done??
>
> >A vari-mu device simply has a more gradual negative
> >Ia/Vg slope, making it easier to control.
>
> Yes, I've seen the charts in reference to RF amplifiers.
>
> >A bonus with vari-mu pentodes is that you can buy
> >tens of thousands of them for absurdly low prices...
>
> Are there any particular remote-cutoff pentodes that you would recommend
> for audio applications such as a VCF??
>
> Perhaps a VCA/VCF using the same tubes could be built to run off of the
> same PS.  That could make a nice diy project, especially considering that
> etching PCB's might not be necessary.  While all the point-to-point tube
> devices I've seen use brass or steel, couldn't the sockets be mounted on a
> sheet of plywood in a metal rack box, or is that a fire hazard??

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