furui_suterioo
Quad & 70s Enthusiast
There are some medium sized caps underneath the slanty board, maybe power supply related.
CD-4 demodulators must have been a repairman's worst nightmare. And given the seemingly endless problems associated with these things I wonder how many of them were never even set up properly in the factory.And Lordy, Lordy... look at all those coil & trim pot adjustments.
I noticed the spec sheet said 100 volts input. Might need to get a stepdown transformer for 120 volts!CD-4 demodulators must have been a repairman's worst nightmare. And given the seemingly endless problems associated with these things I wonder how many of them were never even set up properly in the factory.
This is the CD-4 demodulator in my Technics SS-1100D system.CD-4 demodulators must have been a repairman's worst nightmare. And given the seemingly endless problems associated with these things I wonder how many of them were never even set up properly in the factory.
Indeed. Looking at the rear photos from the actual auction, its a 100V model. I'm not surprised though, as every 3480 or 3580 I've paused to look at have all been 100V. It would be convenient to find a 120V version though. If furui_suterioo has previously already branched into Japanese quad equipment he may already have a 100V step-down transformer.I noticed the spec sheet said 100 volts input. Might need to get a stepdown transformer for 120 volts!
I reverse engineered it. With the sections identified on the pcb, it was easy to understand it's working principle. It is simple, effective and large! About 4 inches x 11 inches.I'm amazed how simple it looks - only forty or so transistors. Clearly they didn't make enough money out of those and had to make them much more complicated and expensive.
Yep, and the two extra outlets on the demodulator are useful since my step down transformer only has 1 outlet.Indeed. Looking at the rear photos from the actual auction, its a 100V model. I'm not surprised though, as every 3480 or 3580 I've paused to look at have all been 100V. It would be convenient to find a 120V version though. If furui_suterioo has previously already branched into Japanese quad equipment he may already have a 100V step-down transformer.
I reverse engineered it. With the sections identified on the pcb, it was easy to understand it's working principle. It is simple, effective and large! About 4 inches x 11 inches.
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