Hi, I am a longtime lurker, but don't post here much. I have a question about an late 1940s Harmony Model H-195 I recently purchased. I believe it originally had a field coil rola speaker in it. It currently has an 8" 8 ohm 5 watt Tesla ARO-666 loud speaker. I would like to replace this speaker with a Alnico magnet Jensen or Weber. I am not sure what ohms the speaker I should be replacing it with. I am unable to find a readable schematic for this model. The Harmony Model H-200 schematic I found, which is a similar model, shows a 6 ohm load for the speaker. Does anyone have any idea what I should be using here? Thanks!