[sdiy] Tube ring mod

[metasonix at earthlink.net]

>>Try decaf.
> Who ate all my choclate-covered coffie beans that I leaft in the fridge???

Ah hahahahahaha!

> Magnus - who still is in the "one day I will do something with tubes" state

Give it a try, Magnus.
It's much more challenging than calculating Ebers-Moll transistor models
(a subject which was, I suspect, beaten to death by 1970).

Be the first person on Earth to do certain things! I've never seen
an EFP60 secondary-emission pentode used as am audio modulator, for example!
(that's a hint)