I was doing some research (looking for reviews) on a amp (Blue Circle BC28) that a coworker was considering purchasing from a audio shop in Amherst MA. one of the "on-line" mags did a review in 2003 and had a lab test the amp with the results to compliment the reviewers article (which was positive by the way) . In the lab test findings they noted that the amps output stage, while resembling power transistors, were actually 4 pin devices, which (they conclude) if you include the case, suggests a power opamp. I can think of only one device that meets this criteria. (LM12) The test report is available here: Blue Circle BC28
Enjoy!
-T
Enjoy!
-T
Further, the interconnection of these devices produces a bridged output signal with two phases of opposite polarity in respect to signal ground from the single-ended drive out of the tube front end.
Based on this kind of nonsense, I wouldn't trust very much of their assessment.
Further, the interconnection of these devices produces a bridged output signal with two phases of opposite polarity in respect to signal ground from the single-ended drive out of the tube front end.
Just a wordy description of a standard bridged output stage.
dave
planet10 said:Just a wordy description of a standard bridged output stage.
dave
Oh, like so I guess:
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leadbelly said:Oh, like so I guess:
exactly....
oOne has to be cautious when the marketing boys get a hold of stuff that has been done forever.
dave
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