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Amp/Preamp Asylum: " Solid state devices are not as linear as tubes..., so a feedback circuit is required" by 1973shovel Looking for a new Amp or Preamp? If you're after tubes, post over here. |
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In Reply to: RE: that's correct -- it's the "SE" not the "T"... posted by mgbpuff on May 17, 2025 at 09:05:46:
Just so I'm clear, are you saying that all solid state amps use feedback? As an F1 owner, I'm sure you're aware that mister Pass says it uses no feedback. (see his quote below) Whether that's truly unique to this SS amp only, I don't know.
What I do know is that my First Watt F1 (since updated to F1J by First Watt) is the best sounding amp that I own. I kinda felt like a traitor to tubes at first, but I quickly got over that. Note that I've always had push-pull tube amps though, never a SET.
"If being a current source amplifier isn't different enough, the F1 is special in other ways. It uses no feedback to reduce distortion, flatten frequency response or create a low output impedance, and it ignores the voltages that appear across the speaker terminals." Nelson Pass, from his F1 power amplifier paper.
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Topic - What Makes SET Amps Tick? - PaulF70 18:19:22 05/16/25 ( 101)
- RE: What Makes SET Amps Tick? - PaulF70 18:55:35 05/31/25 ( 0)
RE: What Makes SET Amps Tick? - PaulF70 17:45:24 05/21/25 ( 5)
- If that amp makes about 7 Watts - Ralph 13:13:29 05/22/25 ( 4)
- RE: If that amp makes about 7 Watts - PaulF70 09:03:45 05/23/25 ( 3)
- What PP amp did you use - Ralph 10:52:14 05/27/25 ( 2)
- RE: What PP amp did you use - PaulF70 17:10:30 05/28/25 ( 1)
- Uh, no you didn't. - Ralph 08:41:56 05/29/25 ( 0)
If they work properly they don't tick. - Ralph 13:00:24 05/20/25 ( 26)
- RE: If they work properly they don't tick. - PaulF70 17:57:55 05/20/25 ( 25)
- RE: If they work properly they don't tick. - Ralph 08:44:34 05/21/25 ( 14)
- RE: If they work properly they don't tick. - morricab 11:56:30 05/21/25 ( 11)
- Apparently you and he don't know the difference between class B and C nt - Ralph 12:50:33 05/21/25 ( 10)
- Self defense - 13th Duke of Wymbourne 16:41:06 05/21/25 ( 9)
- RE: Self defense - Ralph 09:46:00 05/22/25 ( 8)
- Crossing over - 13th Duke of Wymbourne 13:03:24 05/24/25 ( 7)
- RE: Crossing over - Ralph 10:26:50 05/27/25 ( 5)
- RE: Crossing over - PaulF70 09:42:38 05/28/25 ( 4)
- No, that's not the same. - Ralph 10:40:39 05/28/25 ( 3)
- RE: No, that's not the same. - PaulF70 19:56:13 05/28/25 ( 2)
- RE: No, I'm saying we don't know what is really happening here due to the use of innuendo - Ralph 08:25:58 05/29/25 ( 1)
- RE: No, I'm saying we don't know what is really happening here due to the use of innuendo - PaulF70 09:12:56 05/30/25 ( 0)
- RE: Crossing over - PaulF70 08:47:33 05/25/25 ( 0)
- RE: If they work properly they don't tick. - PaulF70 11:48:28 05/21/25 ( 1)
- RE: If they work properly they don't tick. - Ralph 12:48:52 05/21/25 ( 0)
RE: If they work properly they don't tick. - morricab 00:41:22 05/21/25 ( 9)
- RE: If they work properly they don't tick. - PaulF70 13:08:25 05/21/25 ( 4)
- I doubt that is due to crossover distortion - Ralph 13:05:45 05/22/25 ( 0)
- RE: If they work properly they don't tick. - morricab 08:25:12 05/22/25 ( 2)
- RE: If they work properly they don't tick. - PaulF70 09:48:39 05/28/25 ( 0)
- Yes, its not transformer insulation! - Ralph 13:02:59 05/22/25 ( 0)
Ever consider writing novels? - Ralph 08:45:46 05/21/25 ( 3)
- RE: Ever consider writing novels? - morricab 12:01:13 05/21/25 ( 2)
- So please explain what class C is - Ralph 12:51:45 05/21/25 ( 1)
- RE: So please explain what class C is - morricab 06:32:40 05/22/25 ( 0)
RE: What Makes SET Amps Tick? - Geofdillon@gmail.com 23:10:07 05/18/25 ( 17)
- RE: What Makes SET Amps Tick? - morricab 00:45:33 05/21/25 ( 16)
- RE: What Makes SET Amps Tick? - 13th Duke of Wymbourne 18:45:16 05/21/25 ( 4)
- Read Cheever's thesis...it's easy to do... - morricab 06:27:25 05/22/25 ( 3)
- Problems with Cheever's thesis - Ralph 10:59:58 05/22/25 ( 2)
- RE: Problems with Cheever's thesis - morricab 09:30:48 05/26/25 ( 1)
- RE: Problems with Cheever's thesis - Ralph 09:08:52 05/27/25 ( 0)
- RE: What Makes SET Amps Tick? - Geofdillon@gmail.com 13:18:06 05/21/25 ( 0)
This statement is false. - Ralph 11:37:31 05/21/25 ( 9)
- Not according to Cheever - morricab 12:04:08 05/21/25 ( 8)
- And the possiblity you are quoting him correctly is?? - Ralph 12:53:49 05/21/25 ( 7)
- Read his thesis why don't you? - morricab 06:15:47 05/22/25 ( 6)
- RE: Read his thesis why don't you? - 13th Duke of Wymbourne 13:40:37 05/24/25 ( 4)
- RE: Read his thesis why don't you? - morricab 09:35:49 05/26/25 ( 3)
- RE: Read his thesis why don't you? - 13th Duke of Wymbourne 13:31:05 05/26/25 ( 2)
- RE: Read his thesis why don't you? - morricab 06:36:01 05/27/25 ( 1)
- RE: Read his thesis why don't you? - 13th Duke of Wymbourne 13:38:06 05/28/25 ( 0)
- Read it years ago. - Ralph 10:20:25 05/22/25 ( 0)
RE: What Makes SET Amps Tick? - AbeCollins 06:07:02 05/18/25 ( 7)
- An effective solution - E-Stat 16:00:28 05/18/25 ( 4)
- Not looking for a solution - AbeCollins 15:34:35 05/19/25 ( 1)
- Which has become a non issue for the informed -nt - E-Stat 15:54:23 05/19/25 ( 0)
- RE: An effective solution - MaggiesAndCats 07:02:53 05/19/25 ( 1)
- Herbie's used on amps - E-Stat 13:15:05 05/19/25 ( 0)
RE: What Makes SET Amps Tick? - Tre' 08:13:50 05/18/25 ( 1)
- Good point! - nt - AbeCollins 15:35:01 05/19/25 ( 0)
RE: What Makes SET Amps Tick? - hahax@verizon.net 19:17:17 05/16/25 ( 40)
- RE: What Makes SET Amps Tick? - mgbpuff 06:11:41 05/17/25 ( 38)
- that's correct -- it's the "SE" not the "T"... - mhardy6647 08:13:16 05/17/25 ( 37)
- RE: that's correct -- it's the "SE" not the "T"... - hahax@verizon.net 20:43:51 05/17/25 ( 0)
- RE: that's correct -- it's the "SE" not the "T"... - mgbpuff 09:05:46 05/17/25 ( 35)
- No amplifying devices are linear - 13th Duke of Wymbourne 08:06:29 05/19/25 ( 22)
- Yes but some devices are a lot more linear than others - Tre' 07:15:36 05/20/25 ( 21)
- RE: Yes but some devices are a lot more linear than others - 13th Duke of Wymbourne 18:40:26 05/20/25 ( 20)
- RE: Yes but some devices are a lot more linear than others - hahax@verizon.net 22:16:20 05/21/25 ( 11)
- Distortion and frequency response are good starting points - 13th Duke of Wymbourne 23:38:20 05/21/25 ( 10)
- RE: Distortion and frequency response are good starting points - Ralph 11:14:00 05/22/25 ( 6)
- RE: Distortion and frequency response are good starting points - 13th Duke of Wymbourne 18:11:01 05/23/25 ( 5)
- RE: Distortion and frequency response are good starting points - Ralph 10:46:12 05/27/25 ( 3)
- Pedantically, our ears use the pressure of the sound to sense the sound pressure - 13th Duke of Wymbourne 16:54:56 05/29/25 ( 2)
- Its easy to show that higher ordered harmonics are what the ear uses - Ralph 08:26:40 05/30/25 ( 1)
- I retain my title as Most Pedantic Inmate - 13th Duke of Wymbourne 19:28:47 05/31/25 ( 0)
- RE: Distortion and frequency response are good starting points - morricab 10:05:15 05/26/25 ( 0)
- RE: Distortion and frequency response are good starting points - morricab 06:14:16 05/22/25 ( 2)
- RE: Distortion and frequency response are good starting points - PaulF70 08:25:03 05/24/25 ( 1)
- RE: Distortion and frequency response are good starting points - 13th Duke of Wymbourne 15:25:22 05/25/25 ( 0)
- RE: Yes but some devices are a lot more linear than others - morricab 00:49:44 05/21/25 ( 7)
- There is a system that takes advantage of psychoacoustics - 13th Duke of Wymbourne 23:40:17 05/21/25 ( 0)
- A straight wire with gain wouldn't work right with most speakers - Ralph 09:08:20 05/21/25 ( 5)
- RE: A straight wire with gain wouldn't work right with most speakers - PaulF70 08:31:42 05/24/25 ( 2)
- RE: A straight wire with gain wouldn't work right with most speakers - PaulF70 09:37:40 05/28/25 ( 0)
- RE: A straight wire with gain wouldn't work right with most speakers - Ralph 10:33:40 05/27/25 ( 0)
- Its a sonic metaphor...-DUH! - morricab 12:05:44 05/21/25 ( 1)
- Yes. And its one that doesn't hold up if you think about it just a little bit. nt - Ralph 12:54:33 05/21/25 ( 0)
" Solid state devices are not as linear as tubes..., so a feedback circuit is required" - 1973shovel 05/18/25 04:16:57 05/18/25 ( 8)
- RE: " Solid state devices are not as linear as tubes..., so a feedback circuit is required" - morricab 00:52:55 05/21/25 ( 4)
- RE: " Solid state devices are not as linear as tubes..., so a feedback circuit is required" - hahax@verizon.net 22:18:20 05/21/25 ( 0)
- FWIW Ayre solid state amps are zero feedback and don't use SITs nt - Ralph 09:02:11 05/21/25 ( 2)
- And? Never said it had to be SITs... - morricab 12:29:33 05/21/25 ( 1)
- Yes. It was FWIW, just pointing it out nt - Ralph 13:17:28 05/21/25 ( 0)
RE: " Solid state devices are not as linear as tubes..., so a feedback circuit is required" - mgbpuff 11:30:56 05/18/25 ( 2)
- RE: " Solid state devices are not as linear as tubes..., so a feedback circuit is required" - hahax@verizon.net 20:51:00 05/18/25 ( 1)
- Not correct - E-Stat 13:29:42 05/19/25 ( 0)
RE: that's correct -- it's the "SE" not the "T"... - hahax@verizon.net 20:42:03 05/17/25 ( 0)
yes, I am -- ahem -- rather familiar with SE DHT amplification - mhardy6647 18:37:10 05/17/25 ( 1)
- RE: yes, I am -- ahem -- rather familiar with SE DHT amplification - morricab 00:55:21 05/21/25 ( 0)
RE: What Makes SET Amps Tick? - PaulF70 19:38:29 05/16/25 ( 0)