Matchin transistors

[johns at oei.com]

     In preparing to build an ASM-1, I am considering searching for 
     matching transistors.  I assume this means trying to find a pair of 
     transistors that show a close match of a V-be curve for an identical 
     I-b current ramp.  (Is this correct?)
     
     For anybody who has experience, who many samples will one typically 
     need to take before one finds a pretty good match?  And what is 
     considered a good match for VCO and VCF applications?
     
     John Speth - johns at oei.com