That freq spec, well, someone should sweep this transformer.
The HS 56 is a flatter transformer, the bass might be better on the Peerless.
One of the Peerless designs , the E 204 D? has lams with holes in them, some type of weird lam mojo thing that somebody dreamed about while touring a Swiss Cheese factory or something.
Rumor has it that the infamous Ersel Harrison of S 217 D fame might have "borrowed" some design ideas from Western Electric, but don't tell anybody.