Philips D8644 Stereo Radio Recorder - January 2018

I opened my D8644 trying to make a picture of these chips. The servicemanual was right!

 

Strange. Those are Matsushita (now known as Panasonic) ICs in a Philips Boombox. Philips made a range of similar ICs themselves
https://www.alldatasheet.com/datasheet-pdf/pdf/19162/PHILIPS/TDA1010.html

https://www.ebay.co.uk/itm/TDA1010A...669543&hash=item2ae2a0f4f5:g:2iwAAOSws9xeWeWo

 

Yes the TDA1010 is probably lower-powered though. So when they wanted more power, they had to buy it from someone else. Or maybe it couldn't support 15 volts.

 

These Philips models only used one AN7166:
http://wikiboombox.com/Philips D8734
http://wikiboombox.com/Philips D8718

So this D8644 is at least twice as powerful!

 

Philips had used the TDA1011 in de D8614, this chip was also used in their car audio (2x6W). The D8614 was the first in their Soundmachine series before the (al lot identical, you can see that on the outside how the controls are organised) D8718, and later for the D8734 which has a lot in common with these models.

The D8644 however is quite different. For instance, the cassette mechanism is completely changed. Philips had to compete against better boomboxes with more power so maybe they bought an amplifierchip from outside, but I'm only guessing. Philips had also outsourced some of their Hifi components in the 70's/80's so why not use (better) components from Panasonic or Toshiba (radiochips).

Later Philips had their own high(er) output TDA amplifierchips too, which could also be used in bridged mode.
I think these were developed for their car audio where 'hifi' demanded higher wattage output.