For AM reception, the 2A has a bit wider filter range than the 2B.

Big drawback to either is that it is much smaller than most accompanying BA
transmitters - except for the Harvey Wells.

Years ago a friend of mine owned an NC-183D. One day he brought a 2B home
to compare. The next day he gave away his NC-183D to a neighbor kid and
bought the 2B.

Colin K7FM