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In Reply to: Class B does not have to have a zero crossing artifact. posted by Ralph on February 11, 2025 at 09:34:25:
It's inherent in how transistors are non-linear in turn on and shutoff. Here are many examples of even so-called Class AB that have zero-crossing distortion. If you don't put enough bias then it is guaranteed to be there.
https://www.stereophile.com/content/jmf-hqs-7001-monoblock-power-amplifier-measurements
https://www.stereophile.com/content/plinius-reference-150-power-amplifier-measurements
The Class AB mode for this amp has zero crossing distortion and the Class A mode does not.
https://www.stereophile.com/content/naim-classic-200-series-nap-250-power-amplifier-measurements
https://www.stereophile.com/content/infigo-method-3-monoblock-power-amplifier-measurements
https://www.stereophile.com/content/karan-acoustics-master-collection-powera-mono-power-amplifier-measurements
https://www.stereophile.com/content/dan-dagostino-master-audio-systems-progression-m550-monoblock-power-amplifier-measurements
https://www.stereophile.com/content/sae-2hp-d-power-amplifier-measurements
https://www.stereophile.com/content/audio-alchemy-dpa-1m-monoblock-power-amplifier-measurements
https://www.stereophile.com/content/plinius-audio-sa-103-power-amplifier-measurements
Again, AB has zero crossing distortion and Class A doesn't.
https://www.stereophile.com/content/class233-ca-3200-three-channel-power-amplifier-measurements
As you can see, many modern amps suffer this problem even ones called Class AB. Probably only the Naim would claim to be Class B.
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Follow Ups
- RE: Class B does not have to have a zero crossing artifact. - morricab 02/12/2506:57:19 02/12/25 (60)
- If a class AB amp has a zero crossing problem - Ralph 09:49:08 02/12/25 (59)
- RE: If a class AB amp has a zero crossing problem - morricab 06:30:17 02/13/25 (58)
- your statement isn't logical. - Ralph 10:25:30 02/13/25 (57)
- RE: your statement isn't logical. - morricab 23:57:49 02/15/25 (56)
- RE: your statement still isn't logical. - Ralph 09:04:29 02/17/25 (55)
- RE: your statement still isn't logical. - morricab 08:58:43 02/18/25 (52)
- FWIW, something you may not know - Ralph 09:48:44 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)
- Apparently you've not been reading my posts. - Ralph 09:23:57 02/18/25 (46)
- RE: Apparently you've not been reading my posts. - morricab 07:30:36 02/24/25 (8)
- So who are you going to believe? - Ralph 08:16:42 02/24/25 (7)
- RE: So who are you going to believe? - morricab 08:23:38 02/24/25 (6)
- RE: So who are you going to believe? - morricab 03:15:56 02/26/25 (0)
- You gotta try harder than that- hearsay isn't evidence. nt - Ralph 08:39:12 02/24/25 (4)
- RE: You gotta try harder than that- hearsay isn't evidence. nt - morricab 03:17:42 02/26/25 (3)
- If you have the experience it would be first hand. - Ralph 09:48:24 02/26/25 (2)
- RE: If you have the experience it would be first hand. - morricab 00:53:52 03/3/25 (1)
- Res ipsa loquitur nt - Ralph 10:35:24 03/3/25 (0)
- RE: Apparently you've not been reading my posts. - morricab 07:28:04 02/24/25 (21)
- Actually no cold water - yet. - Ralph 08:37:27 02/24/25 (20)
- RE: Actually no cold water - yet. - morricab 03:00:06 02/26/25 (19)
- Apparently you've not been reading my posts. no speculation nt - Ralph 09:31:25 02/26/25 (18)
- RE: Apparently you've not been reading my posts. no speculation nt - morricab 00:58:01 03/3/25 (17)
- When you use name calling that is abusive on most websites. - Ralph 10:34:05 03/3/25 (16)
- RE: When you use name calling that is abusive on most websites. - morricab 00:09:33 03/4/25 (15)
- RE: When you use name calling that is abusive on most websites. - Ralph 08:58:48 03/4/25 (14)
- RE: When you use name calling that is abusive on most websites. - morricab 01:49:45 03/5/25 (5)
- When you attack the patent - Ralph 09:43:55 03/7/25 (4)
- RE: When you attack the patent - morricab 11:49:45 03/7/25 (3)
- Rolleyes... again, how would you like those results? - Ralph 09:59:31 03/10/25 (2)
- RE: Rolleyes... again, how would you like those results? - morricab 10:47:17 03/10/25 (1)
- Data posted at link. - Ralph 10:54:50 03/10/25 (0)
- RE: When you use name calling that is abusive on most websites. - morricab 01:37:00 03/5/25 (7)
- Please do not gaslight me. - Ralph 10:14:38 03/5/25 (6)
- RE: Please do not gaslight me. - morricab 07:08:49 03/7/25 (5)
- more gaslighting. - Ralph 08:27:44 03/7/25 (4)
- If you don't believe me then here is what Doug Self says - morricab 13:07:45 03/7/25 (2)
- :) clearly not a blameless amp - Ralph 10:06:05 03/10/25 (1)
- RE: :) clearly not a blameless amp - morricab 10:50:44 03/10/25 (0)
- RE: more gaslighting. - morricab 11:41:55 03/7/25 (0)
- RE: Apparently you've not been reading my posts. - morricab 04:34:35 02/24/25 (14)
- Since you have a burr under your saddle - Ralph 08:46:40 02/24/25 (13)
- RE: Since you have a burr under your saddle - morricab 03:12:23 02/26/25 (12)
- RE: Since you still have a burr under your saddle - Ralph 09:46:32 02/26/25 (11)
- RE: Since you still have a burr under your saddle - morricab 01:18:31 03/3/25 (10)
- RE: Since you still have a burr under your saddle - Ralph 10:28:52 03/3/25 (8)
- RE: Since you still have a burr under your saddle - morricab 00:15:22 03/4/25 (7)
- You are objuscating. - Ralph 09:12:51 03/4/25 (6)
- RE: You are objuscating. - morricab 01:41:27 03/5/25 (5)
- Apparently you're not interested in the truth. - Ralph 10:16:31 03/5/25 (4)
- RE: Apparently you're not interested in the truth. - morricab 11:52:33 03/7/25 (3)
- Again, for the 5th time now, what will you consider to be data? - Ralph 10:07:08 03/10/25 (2)
- RE: Again, for the 5th time now, what will you consider to be data? - morricab 10:51:49 03/10/25 (1)
- Data posted at link. - Ralph 10:58:02 03/10/25 (0)
- RE: Since you still have a burr under your saddle - morricab 01:22:59 03/3/25 (0)
- Does Quasi Complementary... - Cougar 10:42:32 02/17/25 (1)
- Too many variables to say - Ralph 13:25:36 02/17/25 (0)