[sumnerplace]

Does anyone know if the speaker from a 70 and 71 are the same? I am strictly talking about cathedrals. 
Thanks.

[Radioroslyn]

The 20,70,and 90 used several alliterations of the K speaker (sometimes called a pie pan speaker). It sports a painted brown or coated gray basket. The 71 uses a later K speaker that should work but ascetically is different. The 71 speaker may be hardwired in without a 4 pin plug. Ron would know better than I.
Early https://www.worthpoint.com/worthopedia/s...-132420086
Later https://antiqueradio.org/philc08.htm

[Ron Ramirez]

Nope, the 71B used a K-7 speaker which has an 1125 ohm field coil. 20, 70 and 90 cathedral speakers all have 3100 ohm field coils.

more info here:
http://www.philcoradio.com/phorum/showth...hp?tid=215

Scroll down to, and download speakers.zip which was made in and intended for Microsoft Excel but also works in LibreOffice Calc and OpenOffice Calc.

[sumnerplace]

thanks guys that answers it...