03-31-2018, 04:57 PM
03-31-2018, 05:17 PM
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
Early https://www.worthpoint.com/worthopedia/s...-132420086
Later https://antiqueradio.org/philc08.htm
03-31-2018, 05:46 PM
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.
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.
03-31-2018, 05:48 PM
thanks guys that answers it...