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Chip Amps Amplifiers based on integrated circuits

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Old 28th April 2005, 09:05 AM   #1
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Default Another high end hybred chip amp?

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
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Old 28th April 2005, 03:56 PM   #2
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Quote:
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.
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Old 28th April 2005, 08:54 PM   #3
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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
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Old 28th April 2005, 09:17 PM   #4
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Quote:
Originally posted by planet10
Just a wordy description of a standard bridged output stage.

dave
Oh, like so I guess:
Attached Images
File Type: jpg bridged.jpg (16.6 KB, 529 views)
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Old 28th April 2005, 09:36 PM   #5
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Originally posted by leadbelly
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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