02-02-2018, 12:43 PM
Welcome!
You can find the Philco service bulletin here on AudioPhool: http://audiophool.com/Philco.html
There are also Riders service bulletins available from NostalgiaAir: http://www.nostalgiaair.org/Resources/634/M0013634.htm
The Riders bulletins are OK but often not as detailed. Also the scan quality is a bit better on AudioPhool but you'll need to convert from DJVU format to PDF for viewing.
I've attached the PDF for the 48-460.
According to the parts list the original speaker is part 36-1615.
Have you measured the original? If it's a physical match then I believe it should work fine since it's a permanent magnet speaker.
You can find the Philco service bulletin here on AudioPhool: http://audiophool.com/Philco.html
There are also Riders service bulletins available from NostalgiaAir: http://www.nostalgiaair.org/Resources/634/M0013634.htm
The Riders bulletins are OK but often not as detailed. Also the scan quality is a bit better on AudioPhool but you'll need to convert from DJVU format to PDF for viewing.
I've attached the PDF for the 48-460.
According to the parts list the original speaker is part 36-1615.
Have you measured the original? If it's a physical match then I believe it should work fine since it's a permanent magnet speaker.