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Amp/Preamp Asylum: There are engineers who agree with me too by Ralph Looking for a new Amp or Preamp? If you're after tubes, post over here. |
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In Reply to: Don't buy this posted by Freo-1 on January 27, 2022 at 12:45:22:
Regarding the link from EEWeb, a lot has happened in the MOSFET world in the last 8 years- they have improved a lot. Our class D amp is GaNFET, but in the time it took to do the design work, we saw the improvements in MOSFETs seriously erode a lot of the GaNFET advantages.
At this point the real issue seems to be encoding and dealing with dead time issues, plus of course controlling noise/preventing ringing in the switching circuits.
The other link you provided says a lot of the same things I do, and does not talk about feedback at all.
Bruno Putzeys is an engineer who has been using high amounts of feedback in his circuits and has been doing so for a long time. He has written some excellent papers on the subject. I can provide links if you like.
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Topic - Peachtree Audio Gan400 Amp....Class D now as good as any topology - Freo-1 06:44:53 01/26/22 ( 95)
- RE: Peachtree Audio Gan400 Amp....Class D now as good as any topology - HiOnFi 05:57:47 02/2/22 ( 0)
You continue preaching to a choir - Story 08:42:38 01/28/22 ( 1)
- "We don't trust reviewers any more"... - musetap 15:19:50 01/29/22 ( 0)
RE: Peachtree Audio Gan400 Amp....Class D now as good as any topology - Ric Schultz 23:43:50 01/27/22 ( 28)
- Hate to mention measurements again ... - Feanor 04:57:41 01/28/22 ( 27)
- Very good point - AbeCollins 13:05:08 01/28/22 ( 7)
- RE: Very good point - mjcmt 07:31:20 01/30/22 ( 5)
- RE: Very good point - AbeCollins 08:24:03 01/30/22 ( 4)
- RE: Very good point - Freo-1 08:53:55 01/30/22 ( 3)
- RE: Very good point - AbeCollins 07:53:50 01/31/22 ( 2)
- RE: Very good point - Freo-1 12:04:54 01/31/22 ( 1)
- RE: Very good point - AbeCollins 21:00:57 01/31/22 ( 0)
- Not many GanFET amps out there yet - Freo-1 14:21:26 01/28/22 ( 0)
RE: Hate to mention measurements again ... - Ric Schultz 10:39:00 01/28/22 ( 17)
- Usually you can measure it if you think about it - Ralph 12:23:15 01/31/22 ( 12)
- Absolutely Wrong!!!! - Ric Schultz 17:45:15 02/1/22 ( 11)
- Sorry... - Ralph 08:50:07 02/2/22 ( 10)
- Show us the distortion graphs of various low inductance resistors - Ric Schultz 14:08:12 02/2/22 ( 9)
- To really know what a resistor does - Ralph 14:48:03 02/2/22 ( 8)
- Nope - Ric Schultz 15:15:10 02/2/22 ( 7)
- We'll just have to agree that we don't agree - Ralph 09:43:17 02/3/22 ( 6)
- Lots of audiophiles hate measurements because ... - Feanor 12:46:25 02/4/22 ( 3)
- Ah however, it depends on what measurements are provided - Freo-1 13:41:11 02/4/22 ( 2)
- Agree than more measurement could & should be provided - Feanor 08:12:39 02/5/22 ( 1)
- +1 nt - Ralph 14:34:02 02/9/22 ( 0)
- What this tells me is that reviews don't mean much - Freo-1 13:31:54 02/3/22 ( 1)
- This cannot be overstated. - Ralph 12:40:47 02/4/22 ( 0)
Different power supplies? - Freo-1 11:48:49 01/28/22 ( 2)
- RE: Different power supplies? - Ric Schultz 21:18:10 01/28/22 ( 1)
- The specs between the LSA and Gan400 are in fact different - Freo-1 05:26:57 01/29/22 ( 0)
Thanks for the info -nt - Feanor 11:01:40 01/28/22 ( 0)
RE: Hate to mention measurements again ... - Freo-1 06:54:34 01/28/22 ( 0)
RE: Peachtree Audio Gan400 Amp....Class D now as good as any topology - John Elison 18:59:55 01/27/22 ( 0)
Only 'New Believers' proselytize - bare 09:53:23 01/27/22 ( 0)
Modern class D amps are excellent - Mike K 08:18:30 01/27/22 ( 4)
- Some makers are understanding that they can't better the best class D - Feanor 08:36:47 01/27/22 ( 3)
- Cost of Mfg is Why.. - bare 09:56:39 01/27/22 ( 0)
- I think there will always be tube amps, Class A, Class AB, etc. - AbeCollins 09:56:31 01/27/22 ( 1)
- I don't think class D designers have duplicating tube sound in mind - Feanor 12:17:56 01/27/22 ( 0)
RE: Peachtree Audio Gan400 Amp....Class D now as good as any topology - cawson@onetel.com 07:25:54 01/27/22 ( 5)
- RE: Peachtree Audio Gan400 Amp....Class D now as good as any topology - Freo-1 08:31:29 01/27/22 ( 4)
- Exactly right.... - AbeCollins 10:05:35 01/27/22 ( 3)
- Except for... - E-Stat 10:33:51 01/27/22 ( 2)
- RE: Except for... - AbeCollins 12:03:03 01/27/22 ( 1)
- RE: Except for... - E-Stat 12:20:40 01/27/22 ( 0)
Possibly but I'm not convinced given my Peachtree experience.... - AbeCollins 14:51:58 01/26/22 ( 44)
- two differences GaNFETs vs MOSFETs - Ralph 10:47:18 01/27/22 ( 0)
This amp is NOT your father's Class D amp from the past... - Freo-1 15:17:53 01/26/22 ( 42)
- Proof of the pudding is in the ... - Feanor 08:21:50 01/27/22 ( 33)
- Don't trust ASR - Freo-1 09:05:58 01/27/22 ( 32)
- ASR has it's place. As for feedback ... - Feanor 13:26:24 01/27/22 ( 2)
- RE: ASR has it's place. As for feedback ... - Freo-1 13:40:09 01/27/22 ( 1)
- RE: ASR has it's place. As for feedback ... - cawson@onetel.com 02:23:25 01/28/22 ( 0)
- feedback - Ralph 10:54:28 01/27/22 ( 28)
- Don't buy this - Freo-1 12:45:22 01/27/22 ( 27)
- There are engineers who agree with me too - Ralph 01/27/22 13:24:36 01/27/22 ( 25)
- Please do...Always up for learning. - Freo-1 13:49:59 01/27/22 ( 24)
- RE: Please do...Always up for learning. - Ralph 08:29:16 01/28/22 ( 23)
- Years ago I read Nelson Pass' article on the subject - Feanor 05:14:22 01/29/22 ( 21)
- Also read Norman Crowhurst- he says the same thing - Ralph 09:47:29 01/31/22 ( 0)
- RE: Years ago I read Nelson Pass' article on the subject - Freo-1 07:49:06 01/29/22 ( 19)
- As I'm given to understand ... - Feanor 04:32:13 01/30/22 ( 18)
- Can't minimize the deltas between GanFET and MOSFETS - Freo-1 05:28:27 01/30/22 ( 17)
- in the period of time that paper was written - Ralph 13:12:37 02/1/22 ( 14)
- What's the key to the Gan sound? - Freo-1 13:27:37 02/1/22 ( 13)
- RE: What's the key to the Gan sound? - Ralph 13:50:32 02/1/22 ( 12)
- Looked for your class D amp on the website - Freo-1 12:57:55 02/2/22 ( 3)
- We've not put up a page yet - Ralph 13:19:12 02/2/22 ( 2)
- Nice! - Freo-1 13:39:06 02/2/22 ( 1)
- Right now- in limited quantities nt - Ralph 13:40:54 02/2/22 ( 0)
- Can this behavior be measured? - Freo-1 07:32:30 02/2/22 ( 6)
- Yes - Ralph 09:14:27 02/2/22 ( 5)
- That 2nd/3rd MASK other distortions is what I've come to believe - Feanor 04:44:54 02/8/22 ( 0)
- Can you post some measurements that support this? - Freo-1 10:30:30 02/5/22 ( 2)
- We're working on it - Ralph 10:26:37 02/7/22 ( 1)
- Thanks Ralph ! Much appreciated. - Freo-1 12:38:39 02/7/22 ( 0)
- Much appreciated! - Freo-1 10:49:21 02/2/22 ( 0)
- RE: What's the key to the Gan sound? - Freo-1 15:52:43 02/1/22 ( 0)
- Indeed, the argument for GaN is compeling - Feanor 09:34:54 01/30/22 ( 1)
- RE: Indeed, the argument for GaN is compeling - Freo-1 10:40:35 01/30/22 ( 0)
Thanks Ralph - Freo-1 09:03:33 01/28/22 ( 0)
Another Link - Freo-1 13:09:01 01/27/22 ( 0)
My father had vacuum tubes - Jack G 05:50:57 01/27/22 ( 0)
Is that your claim or Darko's ;-) - AbeCollins 21:28:52 01/26/22 ( 4)
- RE: Is that your claim or Darko's ;-) - Freo-1 05:01:53 01/27/22 ( 3)
- RE: Is that your claim or Darko's ;-) - AbeCollins 09:46:48 01/27/22 ( 2)
- I'm afraid you may be right on that. - Freo-1 10:11:18 01/27/22 ( 1)
- The other option... - Jack G 11:52:19 01/27/22 ( 0)
RE: This amp is NOT your father's Class D amp from the past... - Freo-1 18:42:25 01/26/22 ( 1)
- RE: This amp is NOT your father's Class D amp from the past... - AbeCollins 20:40:56 01/26/22 ( 0)
RE: Peachtree Audio Gan400 Amp....Class D now as good as any topology - DKL 13:13:00 01/26/22 ( 2)
- RE: Peachtree Audio Gan400 Amp....Class D now as good as any topology - Freo-1 14:38:16 01/26/22 ( 1)
- RE: Peachtree Audio Gan400 Amp....Class D now as good as any topology - AbeCollins 14:52:38 01/26/22 ( 0)
you don't list your primary system in the 'Home Rig' - Story 07:48:57 01/26/22 ( 1)
- Copy that - Freo-1 08:18:39 01/26/22 ( 0)