Germanium transistors

[CGS2510.SEP.STUDENT.UCA at CUB.UCA.EDU]

> > I'm looking for germanium transistors for fuzz boxes like the fuzz face, 
> > etc.  I have some really old unmarked transistors with wire leads in a 
> > round black metal case and some transistors marked GT34HV in oval metal 
> > cases.  How can I tell if either of these are germanium devices?

Has anybody tried using antiquated diode junction like Cu/CuO or 
Selenium or galena/cobalt steel like in crystal set rather than the 
typical silicon/germanium crowd?