[Mike_RF]

Greetings to all- This is my first post on this board. 

I have been restoring old "Boat Anchor" communications equipment for some time now. Mostly stuff like Hallicrafters, Hammerlund, Lafayette and Johnsons transmitters.

So recently i came upon a chance to buy a Philco Model 90 that needed a speaker assy. It was in nice shape cabinet wise, but the radio needs the usual extensive amount of attention to make it fly again. 

So not too smart me buys a complete speaker unit off ebay. AND THEN i find out that there are 2 ouput configurations for the model 90 lowboy. 

Two 47s in a push pull arrangement and one 47 in a single ended set up.

As you can already guess the speaker i bought off of flea bay was for two 47s, not one. Shucks. And of course i discovered this all after the fact.  

So now to try to sort this out. I would really like to see this ol girl play again as the cabinet is nice. What a treat that would be. 

Since this is my first shot at anything this old, this speaker system is something foreign to me. I know little about them. 

So I have the original 3 wire black transformer that was on top of the original speaker. Im thinking i can swap it with the 4 wire speaker when it arrives here.

But... I dont know 2 things. a) can i do that swap? and b) how does one test the original one? From the black wire I have 450 ohms on one side, and from the black to the other wire I have like 500K. This seems high to me. Maybe im wrong. 

So im hoping someone in the know here can bump me in the right direction.

Cheers