JLH "Liniac" RIAA

[rickpt]

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

 

[tiefbassuebertr]

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

I don't think so. It is a MC head amp.

 

[tiefbassuebertr]

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 ~

URL is death. here is the pdf:
https://web.archive.org/web/2014070...rld-1971/The Liniac - John L Linsley Hood.pdf

 

[DoctorRad]

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.

 

[tiefbassuebertr]

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...

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.
Therefore the question: which brand have such a RIAA phono stage as commercial product ?