I could be mistaken, but I think that 555 was designed by Morris Kessler, Mr. ATI
Nelson Pass.
I could be mistaken, but I think that 555 was designed by Morris Kessler, Mr. ATI
1)...many (not all!) of the 1970s Yamahas used a switch rather than jumpers to tie the preamp and power amp sections together. The switches will cause some fun of their own at this late date (i.e., they get dirty, of course, but the audible symptoms range all over the map).
2)I do hope Peter Aczel wrote "yakback" and not "yackback".
3)...A friend used his CA-600 integrated amp as a preamp only... for his Polk Audio Monitor Series Model 10 loudspeakers (e.g.).
I've owned and still do own a pair of Monitor 7As (bought from Polk's first retailer, Soundscape in Baltimore) since 1978. I ain't sneerin'. Great products for the money in those days. Matt Polk & I share an alma mater -- although he was a few years ahead of me.3) For those who might want to look down on Polk, or don't recall their early products, your friend's Monitor 10s were nothing to laugh at. Very respectable for the day.
Sure. It's an obsession. But you probably won't go to jail over it. And don't worry about what your neighbors say. All neighbors talk about the 'guy nextdoor'!I also have a little... ahh... thing... for vintage Yamaha products of that era -- in full disclosure.
Yes for sure, comparing to a well designed class A/B amp with no crossover distortion would hardly make a point. BTW how does the non-switching come into this (I might have just missed it)?It's a blatantly deceptive plot.
Not only do we know the residual is likely 60-80dB down and amplified by the output of the distortion meter for the "scope output jacks" (probably 1000 times at least for that X/over image), we also don't know the second trace's sensitivity (V/Div).
Without signal processing to get rid of the noise, I don't reckon I could get a clean X/over distortion residual even if I deliberately drop the bias right down for a pretty pic, but I'll have a go now I've repaired my distortion meter's self cancelling range switch array. (The most fiddly thing I have done this year)
The Benchmark plot is really no better than the hundreds of "night and day" "with and without" pictures in HiFi brochures over the years.
Pioneer (July 1985)
View attachment 67937
Yes, sir. Walking distance (if one were desperate enough) from my alma mater -- but always better to drive. Would be a long walk, especially carrying a hifi component.Soundscape, that brings back memories. Cold Spring Lane, if I recall correctly.
The success of Polk had more to do with Sandy Gross than anything else.
Just be aware that "some" has been predetermined and baked-in for you by Mr Pass....
OWNER'S COMMENTS: Pass Amp Camp Amp 1.1 (by Mitch Barnett)
http://archimago.blogspot.com/2020/07/owners-comments-pass-amp-camp-amp-11-by.html
...
[ As Arch has alluded to, with that amount of 2nd harmonic distortion, this reminds me of tube sound. It has that “glassy” sound to the top end, which I am a sucker for. I know the objective measurements are not good, but listening to music, I don’t find anything really objectionable about the sound quality. So what if I like some sugar on top of my accurate sound? ]
MEASUREMENTS: Pass Amp Camp Amp (ACA) 1.1. The crossroads between objectivism and subjectivism, and reconsidering von Recklinghausen.
http://archimago.blogspot.com/2020/07/measurements-pass-amp-camp-amp-aca-11.html
[ Permit me to be blunt. This is the worst measuring amplifier I've done to date and these measurements will likely not be "outdone" by another device soon in this blog! ]
OWNER'S COMMENTS: Pass Amp Camp Amp 1.1 (by Mitch Barnett)
http://archimago.blogspot.com/2020/07/owners-comments-pass-amp-camp-amp-11-by.html
[ I purchased these kits seven years ago to drive high efficiency compression drivers, which are typically rated at over 113 dB/W/m. ]
[ What is interesting is that I have had several lower distortion amps like the Purifi 1ET400A and active speakers like the Kii THREE and Dutch &Dutch 8c here. ]
[ As Arch has alluded to, with that amount of 2nd harmonic distortion, this reminds me of tube sound. It has that “glassy” sound to the top end, which I am a sucker for. I know the objective measurements are not good, but listening to music, I don’t find anything really objectionable about the sound quality. So what if I like some sugar on top of my accurate sound? ]
The entire 'subjectivist' vocubulary is questionable. Harry Pearson is credited with trying to clarify it, but IMO he just muddied the waters. Glassy, dark, liquid, hard, soft, grainy and all the rest. I think much is simply imagined. However, there is no doubt that using a limited use amplifier with a problematic loudspeaker can produce weird sounds.To me, glassy treble is emblematic of bad/early solid state.
Yup. Synergy is a vector quantityHowever, there is no doubt that using a limited use amplifier with a problematic loudspeaker can produce weird sounds.
PS The ACA has plenty of power (even at reasonable distortion levels) for loudspeakers with 100+ dB sensitivity.
I'd like to see this tested. I doubt it's consistent across the spectrum.loudspeakers with 100+ dB sensitivity.
Yup. Synergy is a vector quantity
PS The ACA has plenty of power (even at reasonable distortion levels) for loudspeakers with 100+ dB sensitivity.