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Hi folks. About a week ago I posted a message about my freebie from a co-worker(sansui G7500 reciever) I'm jus fishin for info....wish I could get a manual. This thing sat in shop foremans office for more than 20 years!! Knobs need cleaning up....otherwise this thing looks like it came from the factory YESTERDAY. Could someone please tell me about "PURE POWER DC" . is a direct coupled amp. something uniqe to sansui....I dont recall seeing any other vintage (or moderen reciver) called "DC". A big advantage in sound???
Follow Ups:
The DC coupling marketing thing was a big deal in its day. Early 70s transistor designs used a large capacitor to connect the speaker to the final amp stage. Not only were these caps expensive, newer circuit topologies eliminated them as much to reduce cost and weight (remember this stuff came from Japan). The first receivers and integrated amps using this arrangement got plenty of competitive marketing attention, hence the "DC" references you see on these amps.Ron is also correct that many of the interstage coupling caps were also being removed during this time of the early 70s. Generally, you can use much of the marketing mantra you see on various vintages of amplifiers/receivers as milestones in the designs employed in these amps. We still see this today in the discussions of various amplifier design classes such as "Class A, Class B/B1/B2, Class H", etc.
For example, I have an 80s vintage Technics receiver in the garage that proudly displays a Class H label on it. The fact that not every amp marketed today is not a Class H design tells you something about the success of that particurlar attempt to provide a more efficient amp design.
Just my thoughts on the matter.....
Cheers,
nt
well, I'm not familiar with that particular amp, but a "direct coupled" amp is one which doesn't use caps to connect one stage of the amp to the next stage. Not using caps to connect the stages of the amp passes not only the AC (signal) to the next stage, but also passes the DC.
Ron
nt
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