Plug it in and listen. They are great mics and very often over looked
these days.

I like to use them on guitar amps when there are 2 guitars, I'll use a
MD421 or SM57 on one and use the 664 on the other one just so the tracks
don't have the same tonal qualities and blend better in the mix.

What's it worth? Maybe $75 in mint cond.





http://www.vintagemicsales.com