[sdiy] passive ring modulator

[Nrthrnsol at aol.com]

hey
i am new to the world of diy synth but we all gotta start somewhere right
i was wondering if you all could help me with a little problem i been having trying to fing some parts for a passive ring modulator

the parts list calls for these:
Two (2) Stancor A-4713 driver transformer or equivalent
Four (4) diodes GE45A or equivalent
Three (3) suitable jacks
One (1) mounting box

now i have already found that
i can use 
MOUSER TM018 transformers for the stancor A-4713 driver transformers
and the jacks and housing is easy 
but i am having trouble finding the 
Four (4) diodes GE45A or equivalents

do you guys know(of course you do)of what other equivalents i could use for these...i believe they are supposed to be germanium diode

please help!! 

thanks guys