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Nick Sukhov SU-XXI MM Phono stage -85 dBA SN ratio...

About 20-25pf in the arm . The signal cable of many Japanese turntables had a very small capacity - 60-70pf. I had several Japanese turntables - Sony, Hitachi, Pioneer, Kenwood , Onkio , and others - all of them had a cable with a small capacity
I must say we live in 2022 not 1982 and most modern turntables have inbuilt phono preamp. I.e. without any cables. See here [ https://www.patreon.com/posts/protsentazh-86-71932355 ] my yesterday`s calculations: 86%.
 
There's one argument I agree with at Paul McGowan: people like to have the choice of changing components , that is why active speakers didn't get to the heart of audiophiles...They want to use their favourite cart with their favourite preamp, then change it with another, then change the cart and its loading...
If you look into how manufacturers did their phono setup in the 80's you see a constant 100pF loading in most preamps and you wonder why...
Well.... they used to sell an entire line: turntable with one cart, one receiver or control preamplifier, then one amp and speakers, yet the line still allowed changing every component.
The turntable came with its own cart already attached on the tonearm and a carefully chosen stereo cable that would match the added capacitance to the 100pF inside the preamp so that the cart had the right loading recommended by the cart manufacturer.
If you wanted a different cart on your tonearm you only change the link cable between the turntable and phono preamp with the right capacitance.
If you want to promote a turntable with all set inside cart and preamp you're looking into "active speaker" market philosophy that never got to public heart. O still wait from B&W an active Nautilus, 802 or 804 🙂
Maybe the smartest people bought active
studio monitors, but I don't see many audiophiles doing it yet...
 
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I must say we live in 2022 not 1982 and most modern turntables have inbuilt phono preamp. I.e. without any cables. See here [ https://www.patreon.com/posts/protsentazh-86-71932355 ] my yesterday`s calculations: 86%.
Personally , I find it very funny to look at these modern turntables with built - in phonopreamps . Most of them are cheap Chinese Hanpin . And I strongly suspect that neither Audio Technica , nor Denon , nor Onkyo actually have anything to do with the development of these turntables . They just paid the Chinese money ..... I use good vintage turntables ( and I like it ) . And phonopreamps in separate cases ( I have a lot of them ) .
 
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Could you, please, help me with some piece of information? I have a lot of these caps from a multichannel recording mixer Elektronika pm-03.Could you tell me what dielectric is used in them or what european type would they be similar to? I destroyed one and saw it's film and foil construction and usually that's good.I have lots of filters in cassette players and phono preamps to work on and they look very appealing to me as I have them in serious quantities.
 

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Could you, please, help me with some piece of information? I have a lot of these caps from a multichannel recording mixer Elektronika pm-03.Could you tell me what dielectric is used in them or what european type would they be similar to? I destroyed one and saw it's film and foil construction and usually that's good.I have lots of filters in cassette players and phono preamps to work on and they look very appealing to me as I have them in serious quantities.

Metallized Polyester film capacitor K73-9​

 
[WITH multilanguage subtitles! ] Finally, I gathered my courage and created a large and detailed master class on noise in audio equipment. Turned out to be an hour long video! And the used circuit (for Microcap 12) files and books - at the link below. In general, I want to say that noise is the most difficult and mysterious part of designing and testing audio devices. Indeed, voltages and currents are summed here not arithmetically, but square root-of-sum-of-squares, subtracted only correlationally, the inverting input of the op-amp makes noise more than the non-inverting one, and the passive 47 kΩ resistor hisses more than the active bipolar. Therefore, many circuit engineers are afraid of noise like fire, limiting themselves in designing to a constant mode, frequency response, phase response, clear, and at best adhering to the general (often incorrect) recommendations that have set the teeth on edge "it would be necessary to take a smaller noise factor." But in vain, - Microcap allows you to analyze thermal-shot-flicker noises to the smallest detail, I'll show you everything now. "Noise in audio" masterclass with multilanguage subtitles
 
Right...so tweeting that high frequency ringing pattern ( associated to a SNR that humans can't even hear on vinyl if on any source at all) is better than the linearity and just good enough SNR you get from Leoniv's type of circuit...That was discussed by others too:
http://waynestegall.com/audio/riaa.htm#mozTocId495677
The noise you get from an inverted input is also more uniformely distributed in the frequency range making the total SNR less dependent on frequency which is a plus at a subliminal level.
Bipolar transistor input current noise has simillar effect 😉
 

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the linearity and just good enough SNR you get from Leoniv's type of circuit...
A little note is required regarding the results shown in this video. The comparison showed not the noise difference between two different amplifier topologies, but the noise difference between AD745 and LSK389. If you use the same components, both circuits will show approximately the same noise.
 
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