the ticket machine on the left does NOT dispense TAP cards. the one on the right can dispense TAP cards. the one on the right can also add cash value to a TAP card.
you can tell the difference by the sign on the top.
these are at the entrance to the Metro Gold Line at Los Angeles Union Station
EDIT: the sign specifically mentions TAP dispensing, and not adding cash value. but if you see one with the sign, I'd try it first.
EDIT 2: Now seen on "The Source": thesource.metro.net/2011/03/22/heres-a-list-of-ticket-mac...