[sdiy] Tube!

[Travis Shire]

> >> Cool... I think maybe a solid-state gain stage before the actual
> >> tube circuit might do it.
> >
> > What's the input sensitvity of your circuit?
> >
>
> You know, I'm not actually sure... this is one of those things that I
don't know too much about in regards to electronics. Ho do I find out?
>
> Also, I plugged in a 12AX7 last night, using the same voltage, and it was
definately louder and there was a bit less power supply hum.
>
> -Ian

That goofy tube only has a gain of 13. I'd say use at least a 12au7 with
realistic (200v+) plate supply so you'll have some headroom. What do you
plan to do with it? Use it as a buffer stage?