Call or e-mail Wizard. one is not any better than the other, just a slight defference, A= more modern, C=vintage.
Short answer, but Rik really did not like this kinda stuff being discussed. He thinks too much is made out of it for what it is really worth.
Rik told me he uses which ever tranny, be it a or c to get each individual modern classic to sound like they all should. Which is generally speaking the same, yet like any amp lines there does end up some differences.
But take the short eqiuvalent I gave you as a guide if you think a certain tranny will make a difference to you.
I have A trannies, for what it is worth.
I absolutely LOVE....
my Modern classic.....