D220 Pro from the inside.

[thumb5]

Thanks @Confused.  That confirms what I'd seen before, and shows some legible markings for the inductors on the 140 Pro ADH board: namely WE 150 1704.  I'm pretty sure they're 15 μH inductors made by Wurth Elektronik like the ones on the 250 (the "1704" part is probably a date code, I guess).

Because the 140 output carries lower current, these parts have higher inductance for the same physical size than the ones on the 250, so you only need about one third the number (that is, 5 vs 14 per channel) to make up roughly the same total inductance.