> this would be interesting of course,
> but there is one thing which we have to think about.
> ken stone uses germanium diodes in his circuit which are
> more than 30 years old, he recycles them from old computers.
> i'm not sure if the needed diodes are easy to get for dieter.

This would not really be a problem. E.g. matched A-113 Germanium diodes made
by Tungsram are available on the market.

Best wishes
Dieter Doepfer