Allnic, Herron or Tavish choice?

You'd have to get the Allnic H3000 at least, in order to get that feature in an Allnic phono stage, unless the H1201 can do it.  (I'm not sure.) The H3000 is around $12,000 new, or about $7,000 used. So far as I know, the Herron only accommodates the output of one cartridge at a time, so that ought to let it out of your consideration.  I know nothing about the Tavish. Never heard of it.  For a phono stage that CAN accommodate multiple tonearms (in addition to the H3000), you might consider the Manley Steelhead, which you can buy for about $4,000 or less, used.  However, with all due respect, at those price points, you may want to consider how they match your downstream components.

Why does the Allnic 1201 and the Herron, both have seperate Mm/MC inputs then? Isn't that so all you have to do, is switch over the dial?

Musky, If what you say is true, I am wrong.  Now I think of it, you're probably correct.  The only restriction with both of those units would be that you've got to run one MM and one MC (or one high output and one low output cartridge), not two of one type, in order to take advantage of the dual phono inputs. Both units are said to be superb by most owners.

Your PAM-3 preamp has a line-level input impedance specified as "10K minimum." 10K is much too low to be a suitable load for the Herron phono stage (Keith Herron recommends 50K or more, although 30K seems to work ok for some users). I have my doubts about whether such a low impedance would be optimal with the Allnic or the Tavish, either. Or with many other tube-based phono stages.

Lew’s suggestion of the Manley Steelhead would be ok with respect to impedance compatibility, though.

Regards,
-- Al