Hi guys
There also a article in vinyl engine from JLH that seems to be a improvement of the original liniac circuit.
Here is the link.
John Linsley Hood RIAA Preamp - Manual - Reference Standard Phono Pre-Amplifier - Vinyl Engine
There also a article in vinyl engine from JLH that seems to be a improvement of the original liniac circuit.
Here is the link.
John Linsley Hood RIAA Preamp - Manual - Reference Standard Phono Pre-Amplifier - Vinyl Engine
I don't think so. It is a MC head amp.Hi guys
There also a article in vinyl engine from JLH that seems to be an improvement of the original liniac circuit.
Here is the link.
John Linsley Hood RIAA Preamp - Manual - Reference Standard Phono Pre-Amplifier - Vinyl Engine
URL is death. here is the pdf:I think the link has not yet been given.
This is the initial Linsley-Hood's article
about his Liniac circuit :
~The Valve ( and Hi-Fi ) Audio Interest pages ~
https://web.archive.org/web/2014070...rld-1971/The Liniac - John L Linsley Hood.pdf
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I built a Liniac RIAA stage, based on series of JLH articles in HiFi News & Record Review in Feb. 1980.
It was Feb 1979, there's a copy of the article here.
By the mid '80s, JLH had designed the 1450 phono stage, which is circuit #2 on this Elliott Sound Products page.
The behaviour by transients like scratches on record surface is better in general compare to serial feedback RIAA stages - this I have read on several articles.The reason behind the shunt feedback, was that the gain at h.f. would go to zero, as the standard requires, rather than rolling-off to 1 as would happen with series feedback around a single gain stage.
I built a Liniac RIAA stage, based on series of JLH articles in HiFi News & Record Review in Feb. 1980.
The cartridge loading resistor was 39 kOhm, rather than 47 kOhms, which reduces the noise contribution by 1 dB. JLH also mentions in the article that the increased loading of the cartridge is supposed to help with playback of square-wave transients.
The stage in the article had a JFET cascode in addition to the circuitry mentioned earlier in this thread. The maximum output voltage of the stage is 6 Vrms - certainly less than a more modern op-amp based stage, powered from +/- 15 V would achieve.
There was a slight rustle to be heard when the record player was off-disc, but noise was significantly less than vinyl surface noise.
Can't really judge the sound quality - it was certainly better than the budget amplifier it replaced, although I had no experience or anything to compare to - and I'd built it, so I'm probably biased...
Therefore the question: which brand have such a RIAA phono stage as commercial product ?