Nelson Pass describes his design process similarly. Of course, math and measurement to get in the right performance and reliability, but listening to create the preferred sound signature with harmonics. Makes sense to me. These statements usually elicit sharp rebuke from those who believe listening has no role in design.
i am not an audiophile but build guitar effects. i definitely notice the FET 'softening' effect that paul described. it's good for a source that is too spikey or pokey. it also makes a good buffer for the input stage
Watching this made me think of o e of Nelson passes crazy eats of a 1000 fet amplifiers he made with rare jfets that are no longer made. He did it just because he had them, and loves .ow wattage class a amps with jfets3. He loves them in preamps as well. He arranged them in such a way they could be repurposed for future projects .
I built a kit amplifier where the designers used all the modern design techniques, Yes those old 2N3055 can sound really nice. Long live the TO3 package.
@paulstubbs7678 With its cousin MJ2955. I have built a few and one with a second set in parallel driven by BD 139 and 140 . My last amp was class D using a TA 2022. . Still have 2 blank boards and 2022. I'm contemplating building but in bridge mode.
FETs are preferred in power amps due to power efficiency & lower noise than BJT. FET amp typically has lower THD. Can you hear the difference? Audiophiles can always hear the difference .. :)
Are you speaking about Class A/B or Class D? Efficiency matters a lot in Class D, because of 'switching losses'. But efficiency is not so relevant in Class A and A/B because losses are a result moreso from the topology rather than device selection. Yes, BJTs eat a little more energy at the base versus the primarily capacitive load of the gate terminal of a FET, but that is an order of magnitude away from the bias current at the output stage. I say this as a practicing electrical engineer, with design and simulation experience, and not as some guy who reads an article or parrots knowledge from others. First hand design experience.
Preferred by who ? There’s nothing wrong with using BJT’s for amplifier finals, it’s just a different animal with its own set of challenges in terms of bias, stage gain, etc. You really shouldn’t comment on technological aspects when you don’t know what you’re talking about. That seems to be a disease with the comments section of this TH-cam channel. No one single type of device will ever be a panacea for every circuit design application, although there are “people” out there that will want you to believe that, but it certainly is not true.
I prefer videos that get into what makes audiophiles tick. That explores the philosophical side, rather than the technical side. A lot of comment section regulars stay out when it's overly technical. But please stay away from "You are an audiophile" if....That's been covered enough. There should be plenty of things to talk about. Many aspects of things to discuss. Maybe it should be a once or twice a week thing. Like an audiophile rap line.
Nelson Pass describes his design process similarly. Of course, math and measurement to get in the right performance and reliability, but listening to create the preferred sound signature with harmonics. Makes sense to me.
These statements usually elicit sharp rebuke from those who believe listening has no role in design.
i am not an audiophile but build guitar effects. i definitely notice the FET 'softening' effect that paul described. it's good for a source that is too spikey or pokey. it also makes a good buffer for the input stage
Also depends on whats available, and that it will be available for a number peripd of years I assume.
Watching this made me think of o e of Nelson passes crazy eats of a 1000 fet amplifiers he made with rare jfets that are no longer made. He did it just because he had them, and loves .ow wattage class a amps with jfets3. He loves them in preamps as well. He arranged them in such a way they could be repurposed for future projects .
Paul what do you think about the new skaa streaming technology.
What is better for an electrostat amp? Bjt or mosfet?
Oh, what a question . Long live the 2N3055 . I can't tell the difference.
I built a kit amplifier where the designers used all the modern design techniques, Yes those old 2N3055 can sound really nice. Long live the TO3 package.
@paulstubbs7678 With its cousin MJ2955. I have built a few and one with a second set in parallel driven by BD 139 and 140 .
My last amp was class D using a TA 2022. . Still have 2 blank boards and 2022. I'm contemplating building but in bridge mode.
What about the abc's?
I wish Paul can put his two cents on Car Audio amplifiers which companies claim to be great and sound like poo.
This guy's Illeism is becoming more and more evident in these videos;..
FETs are preferred in power amps due to power efficiency & lower noise than BJT. FET amp typically has lower THD. Can you hear the difference? Audiophiles can always hear the difference .. :)
Are you speaking about Class A/B or Class D? Efficiency matters a lot in Class D, because of 'switching losses'. But efficiency is not so relevant in Class A and A/B because losses are a result moreso from the topology rather than device selection. Yes, BJTs eat a little more energy at the base versus the primarily capacitive load of the gate terminal of a FET, but that is an order of magnitude away from the bias current at the output stage.
I say this as a practicing electrical engineer, with design and simulation experience, and not as some guy who reads an article or parrots knowledge from others. First hand design experience.
You can hear thd 😂 must really be one horrible amp😂
@@RectifiedMetals THC sounds better. :v
Preferred by who ? There’s nothing wrong with using BJT’s for amplifier finals, it’s just a different animal with its own set of challenges in terms of bias, stage gain, etc. You really shouldn’t comment on technological aspects when you don’t know what you’re talking about. That seems to be a disease with the comments section of this TH-cam channel. No one single type of device will ever be a panacea for every circuit design application, although there are “people” out there that will want you to believe that, but it certainly is not true.
Audiophiles run away from blind testing for fear of being rumbled.😊
Pittsburgh always ask the best questions. Should have been printed on black and gold paper but we'll let it slide this time
What about IGBTs?
Parasound amps have FET driven bipolar output stage for load independent voltage amplifier. Same like IGBT.
Yay 😝..! I go with this ... a good answer !
😂😅
It was no answer at all...
I was waiting for somebody to say something like this. Bravo you let Paul know that his answer had absolutely nothing to do with the question
Howdy.
Did You not watch to the end ???
BJT:s sharpness. FET mellowish.
Regards.
I prefer videos that get into what makes audiophiles tick. That explores the philosophical side, rather than the technical side. A lot of comment section regulars stay out when it's overly technical. But please stay away from "You are an audiophile" if....That's been covered enough. There should be plenty of things to talk about. Many aspects of things to discuss. Maybe it should be a once or twice a week thing. Like an audiophile rap line.
First :-)
No. I was first. :-(
I was first and then I deleted my comment only to gaslight the inevitable guy who will write "first".