Hello Peter
I have many of the old battery sets and on some of them I use
a regular PM speaker,just use an output transformer with it,I
have a few output transformers in my spare parts box and
I try a few and use the one that sounds the best,I find that
the PM speaker sounds better than a horn speaker or a
speaker for these old radios and you can hide it behind the
old radio if you don,t have a cabinet for it ,just thought I
would pass it on,all the best Rick
PS- I do have a few of the old radio speakers but I think with
the shipping it would not be worth buying it from me