Hi There,
I built a daughter board circuit that sits at the current location of SAA2770 of my Philips CD650. With it I can switch between NOS and OS mode by flipping a switch. There's no circuit modification. You can convert it back to the original hardware configuration simply by removing the daughter-board and re-inserting the SAA2770 back to its own socket.
The daughter board:
System running together:
Front Panel NOS indicator:
Mode control switch and NOS indicator wiring:
With the quick A/B listening test results, I prefer the NOS sound. It is more transparent and musical. But it's more susceptible to disc scratches as it's missing the SAA2770 interpolation to cover up the missing data.
A3K
I built a daughter board circuit that sits at the current location of SAA2770 of my Philips CD650. With it I can switch between NOS and OS mode by flipping a switch. There's no circuit modification. You can convert it back to the original hardware configuration simply by removing the daughter-board and re-inserting the SAA2770 back to its own socket.
The daughter board:
System running together:
Front Panel NOS indicator:
Mode control switch and NOS indicator wiring:
With the quick A/B listening test results, I prefer the NOS sound. It is more transparent and musical. But it's more susceptible to disc scratches as it's missing the SAA2770 interpolation to cover up the missing data.
A3K
