ROC electronics do not have quality control standards of the past, this is not meant to be a slur against those people in ROC who are smart and work very hard.
Thanks for letting me know, I thought the same. It's just tough for a fella to get his hands on a S1 Single Crown these days. Be well... Be safe... Aguaazul
When I first started to collect Crown S1's I thought they where fakes as well due to the way the crown was being stamped on the chip.
Yes ROC is my home land. Lol Think Taiwan was producing the TDAs while Singapore was doing CD pros etc
It was special, at least compared to a humble NE5532/4 - a slewrate of 30V/µs for the first amplifier 😉 and it has a probably usable muting function 😉
Philips abandoned it quite quickly. Taste is a personal matter but I didn't think it was special with regards to sound quality. It is special today as one rarely sees one 🙂
Are you serious about the NE5532/NE5534? Original Signetics versions of the NE5534 were/are great opamps.
Are you serious about the NE5532/NE5534? Original Signetics versions of the NE5534 were/are great opamps.
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I meant humble more as "ordinary" - Did you ever listened to a TDA1542? I mean, the only CD-player i did find that used it was the CD207. Well, I'll see, as all the needed parts can easily be salvaged from the other old Philips CDs. I guess it was abandoned because it was way to expensive to manufacture - given that even most of the high-grade Philips CD players used LM833s... And not their own Signetics NE5532s
So true. Texas Instruments NE55xx have a lot more distortion than Fairchilds (now OnSemi).
At that time, the jump in quality from record / FM Stereo radio to CD was so huge that the quality of the op amps doesn't matter. The people were more than satisfied.
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I think you are right. It was a revolution. No one dared even to criticize the new medium.
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Btw, all my shown TDA1541As are real, all harvested from old CD Players. Some have been covered with polyimid tape to preserve the printing. I have a fetish to clean all my boards thoroughly with IPA once in a while. Long ago, I did that with nitro thinner, the poor victim is shown on the lower left.
I just measured the distortion of a TI NE5532AN in a distortion meter, that originally had a Signetics NE5533AN in the input stage. THD=0.0009%, below the instrument's spec.
