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In Reply to: RE: your statement still isn't logical. posted by morricab on February 18, 2025 at 08:58:43:
Show the measurements of the amp in question. Demonstrate how it is possible for a Class B amp to not have zero crossing distortion when it is clear that the transistors are going into cutoff and it is highly non-linear. The disjointedness of the handoff between transistors in Class B, where one is going into cutoff and is non-linear and the other is also non-linear (but with a different transfer function in that region) upon turn on is inherent in the devices and the Class B bias.
A power amp is considered class B if the output transistors go into cutoff at the zero point. So how could such an amp have no zero crossing artifact?
The answer is the driver transistors drive the speaker at very low levels. They don't go into cutoff like the outputs do. At higher levels the outputs are doing the work so the driver section doesn't get hot although heatsinks on driver transistors are common.
Any technician that has seen emitter resistors open up in the output section knows to expect shorted outputs, but you might be surprised to find that if the drivers are OK, an amp damaged in that way might play just fine at a low volume. The driver transistors are the bit you're not thinking about.
In a class B amp if you want it to be musical you'd simply be careful about how the driver section is designed. I've pointed this out several times but not this specifically. I hope this helps your understanding.
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Follow Ups
- FWIW, something you may not know - Ralph 02/27/2509:48:44 02/27/25 (4)
- Interesting - Tre' 12:44:37 03/9/25 (3)
- By this metric, all solid state amps are class A. - Ralph 09:52:24 03/10/25 (2)
- RE: By this metric, all solid state amps are class A. - Tre' 10:12:53 03/10/25 (1)
- RE: By this metric, all solid state amps are class A. - Ralph 10:24:42 03/10/25 (0)
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