Thanks, apart from being mono or stereo the B62 has different heads and electronics from A62. B62 is from 70's and has the same preamps of the A80 while the A62 is from 60's and has a different design while sharing most of the mechanics of the newer model. The same for A67 and B67, they share 99% of the mechanics but the electronics are a little different, even if i would tell they sound quite the same.
