[Ron Ramirez]

Yes, those speakers are interchangeable.

Let's see...what else can you salvage from the 77 besides the power transformer?

The grille cloth. That "falling leaves" pattern is not being reproduced, and is needed on every June-December 1930 Philco console model except the 20 console.

The knobs. Someone may want those for their 1928-30 Philco.

The dial scale. It's the same scale as used on models 30, 41, 96, 111, 112 and 15.

Filter choke, audio interstage transformer, filter condenser can. There are some other, older Philco models that can use the choke and interstage. The filter can is only used on Models 76 and 77, but maybe someone else needs one?

Just some ideas.

I almost forgot to mention: The speaker in the 77 is not the same speaker used in the 70 cathedral. It is the same as used in nearly all Philco consoles between June 1929 and June 1931 (note that the 1929 models used a different speaker plug). It could be used in a 90 console or 111/112, but the sound will be muffled because that speaker probably has that solid, stiff spider used on their 1930 speakers.