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In Reply to: RE: Schematic sematics posted by 13th Duke of Wymbourne on February 7, 2025 at 23:53:00:
A Class AB amplifier is always operating in Class AB.
It never operates in Class A but at times it shares one of the characteristics of Class A. Namely that at low(er) power all of the output devices operate without reaching cutoff. This is something that a Class A amplifier does all the time.
It never operates in Class B but at times it shares one of the characteristics of Class B. Namely that at high(er) power half of the output devices do reach cutoff. This is something that a Class B amplifier does all the time.
A Class AB amplifier is neither Class A or Class B.
It is, at all times, Class AB.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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Follow Ups Full ThreadTopic - This amp is a no-brainer for me - N.B.C. 21:35:54 02/6/25 (152)
- I don't understand the three inputs? /nt - jedrider 09:02:58 03/7/25 (1)
- Could be useful if you have multiple upstream sources - Feanor 04:31:01 03/8/25 (0)
- ASR review of the Topping B200 arrives !!! - Feanor 08:55:07 03/3/25 (3)
- I'd gladly pay 2 -3 times that amount for a USA made version... - peppy m. 09:53:08 03/4/25 (1)
- I can understand that, though for my part ... - Feanor 13:18:54 03/4/25 (0)
- So is it class A/B or class B? Does it matter? - Feanor 04:17:06 03/4/25 (0)
- Frankly I'm waiting for measurements - Feanor 05:03:45 02/23/25 (6)
- RE: Frankly I'm waiting for measurements - Cougar 08:15:57 02/23/25 (5)
- JBL 4345 Clone!! - Jon L 09:03:29 02/28/25 (2)
- I have all the original JBL... - Cougar 07:32:04 03/1/25 (1)
- Kenrick Sound - Jon L 14:05:34 03/3/25 (0)
- I hear rumors about Topping quality but ... - Feanor 16:15:16 02/23/25 (1)
- RE: I hear rumors about Topping quality but ... - Cougar 18:53:40 02/23/25 (0)
- I can see that: Topping products are typically great - Feanor 04:10:12 02/7/25 (138)
- Pretty sure this amp is class B not AB - Ralph 08:46:50 02/7/25 (78)
- Naim is the most illustrious example of class B amp - Wojciech 20:42:52 02/8/25 (0)
- RE: Pretty sure this amp is class B not AB - hahax@verizon.net 20:36:08 02/8/25 (71)
- RE: Pretty sure this amp is class B not AB - morricab 07:50:28 02/10/25 (69)
- Class B does not have to have a zero crossing artifact. - Ralph 09:34:25 02/11/25 (67)
- RE: Class B does not have to have a zero crossing artifact. - morricab 06:57:19 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)
- Like Doug Self's "blameless class B" amp of yore? -nt - E-Stat 12:07:42 02/11/25 (5)
- I don't think so... nt - Ralph 12:40:15 02/11/25 (4)
- Ok - E-Stat 12:46:28 02/11/25 (3)
- RE: Thanks! - Ralph 13:37:56 02/11/25 (2)
- He seemed content - E-Stat 13:44:12 02/11/25 (1)
- Or more like making a digital watch - 13th Duke of Wymbourne 17:49:39 02/11/25 (0)
- RE: Pretty sure this amp is class B not AB - Tre' 11:07:54 02/10/25 (0)
- Better watch out! - E-Stat 11:34:11 02/9/25 (0)
- I guess you're right; thanks for the correction ~n - Feanor 05:06:55 02/8/25 (0)
- Perhaps - E-Stat 11:39:53 02/7/25 (3)
- it is class D (nt) - Leo loves music 11:59:40 02/7/25 (2)
- What leads to to believe - E-Stat 12:11:33 02/7/25 (1)
- not class D - Leo loves music 12:23:56 02/7/25 (0)
- why it is not a class D? - Leo loves music 05:41:22 02/7/25 (58)
- The most common topology - E-Stat 06:46:21 02/7/25 (57)
- RE: The most common topology - Tre' 08:05:03 02/7/25 (54)
- Schematic sematics - 13th Duke of Wymbourne 21:16:23 02/7/25 (3)
- RE: Schematic sematics - 13th Duke of Wymbourne 23:53:00 02/7/25 (1)
- The answer to your question is Class AB - Tre' 02/8/2507:00:34 02/8/25 (0)
- RE: Schematic sematics - Tre' 21:43:00 02/7/25 (0)
- Sorry but - E-Stat 08:14:20 02/7/25 (40)
- Pratt and Whitney - farfetched 15:39:18 03/6/25 (0)
- RE: Sorry but - Tre' 19:33:53 02/7/25 (38)
- RE: Sorry but - E-Stat 19:37:41 02/7/25 (37)
- RE: Sorry but - Tre' 21:27:10 02/7/25 (36)
- In days past, class A was a textbook solution to lower distortion, cathode bias always sounds better to me_nT - Cleantimestream 07:55:17 02/11/25 (0)
- Ask the professionals - E-Stat 06:38:17 02/8/25 (34)
- RE: Ask the professionals - Tre' 06:45:16 02/8/25 (33)
- LOL! - E-Stat 06:49:37 02/8/25 (32)
- Hope they are not giving each other 'feedback'. That is not allowed :) - 13th Duke of Wymbourne 13:14:53 02/10/25 (4)
- Collaboration - E-Stat 15:42:34 02/10/25 (3)
- Who are the dudes? - 13th Duke of Wymbourne 16:57:23 02/10/25 (2)
- RE: Who are the dudes? - 13th Duke of Wymbourne 17:11:36 02/11/25 (0)
- That would be - E-Stat 17:05:25 02/10/25 (0)
- I never said that. They know exactly what they are doing. nt - Tre' 07:01:48 02/8/25 (26)
- I'm delighted that you acknowledge - E-Stat 07:03:39 02/8/25 (25)
- maybe you don't realize this? - Tre' 11:17:07 02/8/25 (0)
- even more. - Tre' 07:54:29 02/8/25 (0)
- More - Tre' 07:39:54 02/8/25 (0)
- RE: I'm delighted that you acknowledge - Tre' 07:22:10 02/8/25 (0)
- RE: I'm delighted that you acknowledge - Tre' 07:20:09 02/8/25 (7)
- Some clarification - 13th Duke of Wymbourne 13:12:24 02/10/25 (6)
- RE: Some clarification - Tre' 20:09:27 02/10/25 (5)
- RE: Some clarification - 13th Duke of Wymbourne 18:55:10 02/12/25 (0)
- RE: Some clarification - morricab 03:45:17 02/11/25 (3)
- RE: Some clarification - Tre' 07:37:47 02/11/25 (2)
- Hmm, best sounding class B is McIntosh; unity coupled circuit IS brilliant, however-nT - Cleantimestream 07:47:47 02/11/25 (1)
- Vintage Mac unity coupled consumer tube amps - Steve O 09:17:08 02/12/25 (0)
- You misunderstood me - Tre' 07:13:46 02/8/25 (12)
- And that's why they call it AB but it is not truly A - AbeCollins 10:35:38 02/8/25 (11)
- Thank you, exactly. - Tre' 11:21:52 02/8/25 (10)
- RE: Thank you, exactly. - morricab 01:02:23 02/11/25 (9)
- RE: Thank you, exactly. - 13th Duke of Wymbourne 13:23:03 02/11/25 (8)
- RE: Thank you, exactly. - morricab 07:08:36 02/12/25 (5)
- RE: Thank you, exactly. - 13th Duke of Wymbourne 12:24:48 02/12/25 (4)
- If you have a "dead zone" - Steve O 14:50:08 02/12/25 (3)
- How do you classify taxonomists? - 13th Duke of Wymbourne 11:18:59 02/13/25 (1)
- Hadn't considered that until now - Steve O 15:41:18 02/13/25 (0)
- RE: If you have a "dead zone" - morricab 06:37:17 02/13/25 (0)
- RE: Thank you, exactly. - Tre' 18:08:12 02/11/25 (1)
- RE: Thank you, exactly. - 13th Duke of Wymbourne 12:33:54 02/12/25 (0)
- there are some amps - Leo loves music 08:11:47 02/7/25 (8)
- RE: there are some amps - Tre' 11:33:15 02/7/25 (7)
- your understanding of class A needs update - Leo loves music 11:48:36 02/7/25 (6)
- You need to do some reading - Tre' 12:58:32 02/7/25 (5)
- why you still don't understand? - Leo loves music 13:03:49 02/7/25 (4)
- You are missing my point - Tre' 19:20:02 02/7/25 (3)
- Why there are many so called professionals lacking of knowledge? - Leo loves music 02:51:45 02/8/25 (2)
- I'm not sure who you are asking about - Tre' 07:06:46 02/8/25 (1)
- My brain full of knowledge - Leo loves music 07:15:43 02/8/25 (0)
- I understand class AB - Leo loves music 07:05:27 02/7/25 (1)
- Honest fumble finger by Bill -nt - E-Stat 15:52:53 02/7/25 (0)
Follow Ups
- The answer to your question is Class AB - Tre' 02/8/2507:00:34 02/8/25 (0)
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