Ringmod transformers

[[22Hz] Productions]

	I am about to attempt the ringmod circuit that Kevin Lightner has 
posted on his site.. (Starting with the tough ones..=)) Anyway, it 
requires 2 driver transformers, and the part listed (Stancor A-4713) 
apparently does not exist anymore.(?) The schematic states that "many 
small driver transformers will work", but neglects to mention anything 
about specs, etc. For those of you who have built this/know what I mean, 
does "many" mean "any" small driver transformer, or is there a certain 
type (EI-19/24?) or spec concerning resistance/impedance/mW output which 
I need to match?

	Jason