build by Nelson Pass

meanman1964 · 9th April 2007, 03:18 AM

I have a question;did Nelson Pass build an amplifier called A18?

meanman1964 · 9th April 2007, 04:51 PM

This amplifier has been made by Nelson Pass and John van der Sluis.The amplifier has output-toroids and you must set the bias together with the loudspeakers while the amp is working.

GRollins · 9th April 2007, 05:33 PM

Nelson is not known for using output transformers.

Grey

meanman1964 · 9th April 2007, 06:06 PM

Quote:

Originally posted by GRollins
Nelson is not known for using output transformers.

Grey

And what in the early days?I maild Nelson but he didn't reply yet.

GRollins · 9th April 2007, 08:49 PM

I think you've pretty much answered yourself.
Nelson's early days would have been the '70s. Toroids used as output transformers didn't become popular until the '90s.
Do you have a link to this putative circuit?

Grey

jacco vermeulen · 9th April 2007, 09:17 PM

Quote:

Originally posted by meanman1964
and John van der Sluis.

You have a sense of humor.
van der Sluis knows squat about designing amps.

GRollins · 9th April 2007, 09:25 PM

I took a moment between one emergency and the next and Googled the guy. I'm assuming you derived Nelson's name from a review that says:

"A similar, if somewhat more extreme, style can be found with Nelson Pass' Zen designs of single-ended MOSFET amps..."

They are comparing the A-18's circuit to Nelson's Zen amps, saying that both are examples of minimalist circuits. They are not saying that Nelson had anything to do with the A-18 design.
For what it's worth, they also make a comparison to Jean Hiraga. Again, they are not saying that Hiraga had anything to do with the design.

Grey

meanman1964 · 9th April 2007, 09:31 PM

Quote:

Originally posted by GRollins
I think you've pretty much answered yourself.
Nelson's early days would have been the '70s. Toroids used as output transformers didn't become popular until the '90s.
Do you have a link to this putative circuit?

Grey

My brother gets this amp this week I'll keep you posted about the amp.My brother is thinking that it is a Pass amplifier and he asked me if it is.I told him I look it up.Maybe it is a modified amp,I only know for sure if I see it.I let you know in time if you're interested.

meanman1964 · 9th April 2007, 09:37 PM

Quote:

Originally posted by GRollins
I took a moment between one emergency and the next and Googled the guy. I'm assuming you derived Nelson's name from a review that says:

"A similar, if somewhat more extreme, style can be found with Nelson Pass' Zen designs of single-ended MOSFET amps..."

They are comparing the A-18's circuit to Nelson's Zen amps, saying that both are examples of minimalist circuits. They are not saying that Nelson had anything to do with the A-18 design.
For what it's worth, they also make a comparison to Jean Hiraga. Again, they are not saying that Hiraga had anything to do with the design.

Grey

That's the same what I told my brother.The guy that sold the amp to my brother said it's a Pass Lab.We'll see.

GRollins · 9th April 2007, 09:39 PM

Assuming the circuit I saw was anything like the one your brother is buying, I think it's safe to say that the A-18's use of MOSFETs for the output stage is about as close as it comes to Nelson's designs.
Of course, there are (ahem) one or two other designs that can make that same claim, so you could also say the A-18 was like any number of other amplifiers...and by extension like their designers' philosophies.
It's a dead issue.

Grey

9th April 2007, 03:18 AM	#1
meanman1964 diyAudio Member Join Date: Oct 2006 Location: Belgium the land of chocolate	build by Nelson Pass I have a question;did Nelson Pass build an amplifier called A18?

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9th April 2007, 04:51 PM	#2
meanman1964 diyAudio Member Join Date: Oct 2006 Location: Belgium the land of chocolate	This amplifier has been made by Nelson Pass and John van der Sluis.The amplifier has output-toroids and you must set the bias together with the loudspeakers while the amp is working.

9th April 2007, 05:33 PM	#3
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	Nelson is not known for using output transformers. Grey

9th April 2007, 08:49 PM	#5
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	I think you've pretty much answered yourself. Nelson's early days would have been the '70s. Toroids used as output transformers didn't become popular until the '90s. Do you have a link to this putative circuit? Grey

9th April 2007, 09:25 PM	#7
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	I took a moment between one emergency and the next and Googled the guy. I'm assuming you derived Nelson's name from a review that says: "A similar, if somewhat more extreme, style can be found with Nelson Pass' Zen designs of single-ended MOSFET amps..." They are comparing the A-18's circuit to Nelson's Zen amps, saying that both are examples of minimalist circuits. They are not saying that Nelson had anything to do with the A-18 design. For what it's worth, they also make a comparison to Jean Hiraga. Again, they are not saying that Hiraga had anything to do with the design. Grey

9th April 2007, 09:39 PM	#10
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	Assuming the circuit I saw was anything like the one your brother is buying, I think it's safe to say that the A-18's use of MOSFETs for the output stage is about as close as it comes to Nelson's designs. Of course, there are (ahem) one or two other designs that can make that same claim, so you could also say the A-18 was like any number of other amplifiers...and by extension like their designers' philosophies. It's a dead issue. Grey

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