[uhler]

Originally Posted by scott v

mostly the type of transistors used, either germanium or silicone?, op-amp or IC (Integrated cicuit design), and true by-pass switching are the major difference between the early versions of the bigmuff and today's reissues...

some links:

Russian Sovtek Big Muff parts-upgrade and rehousing projects
Informative articles on both EH Big Muffs and Sovtek Big Muffs
New and vintage Big Muffs

thanks!