T
tcdriver
Guest
I have a CD-4 demodulator with a bad QSI 5022 demodulator integrated circuit. Is there a known source for these I. C.'s? Thank you for your help.
Sincerely yours,
tcdriver
Sincerely yours,
tcdriver
The pin outs for the QSI 5022 appear to match the pin outs for the ECG813. The 5022 is, indeed, the chip(s) used in the Technics SH-400 and the Heathkit CD-4 board for the AN-2016 Modulus control/preamp. Lou Dorren was the chief designer of the chip.
Doug
I have a CD-4 demodulator with a bad QSI 5022 demodulator integrated circuit. Is there a known source for these I. C.'s? Thank you for your help.
Sincerely yours,
tcdriver
I have a CD-4 demodulator with a bad QSI 5022 demodulator integrated circuit. Is there a known source for these I. C.'s? Thank you for your help.
Sincerely yours,
I just found 3 pieces of the QSI 5022 chips that I received from Lou Dorren back around 1973, while looking for some TI IC's to sell from my large stock. Most of the 5022's I had were sold after my leaving Panasonic as their CD-4 Specialist. Since no sales are allowed on this forum I will be back to eBay.
Hello BobZ I'm not sure about this: are you saying you have a few of the latest chip? It sure looks like there may be some later ones better than an earlier version? Thanks! Bill
Now I'm wishing I could find (if I still have them) my letters to/from RCA back in the day. Some discs were great, others stunk, technical quality wise. I don't know about you, but I figured out you needed the best sound you could get from a quality stereo pressing BEFORE worrying about how your setup worked with CD-4. In other words, if a strain gauge cartridge sounded like metallic crap on a quality stereo pressing, it was not going to be optmum for CD-4. Ditto other cartridges. In fact, that damnable cartridge opened my eyes to the resonance problem of the cantalever assembly. Which you normally took care of (when using a moving magnet) by resonating the coil impedence with a several pf capacitor. All of which RCA called hogwash. I knew right then that it was headed for failure among the golden ear boys. Ah, for the fun times in downtown Chicago. And the tour of the ''sound rooms''.
Forgot I still have 2 more QSI 5022 in my Lou Dorren Demo CD-4 Decoder set in sockets but I will be selling the unit on eBay soon.Well I never heard of a newer version of the QSI 5022 since Lou released the final update around 1974. The 3 pcs. I have may have come from a friends estate as I remember giving him some for his use. and a circuit board but he never built a unit. Left me a lot of his electronics parts etc. I Gave a lot of devices, Boards, filters and literature to almost every audio houses that had an interest in CD-4 Quad in the country.
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