Japan's ultimate RIAA Head Amp - Yamaha HX-10000: who have heard ?

tiefbassuebertr · 01:22 AM

Who have heard this Yamaha Phono Preamp?
http://www.thevintageknob.org/YAMAHA...0/HX10000.html
YAMAHA ƒtƒHƒmƒCƒRƒ‰ƒCƒUHX-10000‚ÌŽd—l ƒ„ƒ}ƒn
http://www.audiostereo.pl/Yamaha_czy...aki_33014.html
http://3rd.geocities.jp/yosikotue/newpage61.html
http://home.j08.itscom.net/studio-k/.../myaudio4.html (scoll down)

Steerpike · 24th February 2010, 10:10 AM

Never seen that before. The MC noise figure is quite impressive.

analog_guy · 6th March 2010, 07:11 AM

The manufacturer either has access to lower noise transistors than I have seen or has screened devices to get those with the best noise figures. I can believe that by going 2 sigma out on the distribution curve that it's possible to get an En that is 50% that of typical. If they used 2SJ74/2SK170 devices and paralleled them they might get En down below 0.1 nV/sqrt(Hz), which is approximately what they would need to get ~95 dB SNR for 500 uV. BTW, I am assuming the 500 uV is applied at 1.0 KHz. Does anyone know for sure?

uli · 6th March 2010, 07:29 AM

Quote:

Originally Posted by analog_guy

If they used 2SJ74/2SK170 devices and paralleled them they might get En down below 0.1 nV/sqrt(Hz)

I assume not J74/K170 but rather J72/K147 and the described duals seem to be (at least from the photo) J73/K146

cheers Uli

analog_guy · 7th March 2010, 10:40 PM

Uli,

Thanks for the additional information. Do you know what the parameteic differences are between those transistors and the 2SJ74/2SK170? Also, it would be interesting to get SPICE models for the devices Yahama is using.

Salas · 8th March 2010, 04:18 PM

Quote:

Originally Posted by Steerpike

Never seen that before. The MC noise figure is quite impressive.

Quote:

Originally Posted by analog_guy

The manufacturer either has access to lower noise transistors than I have seen or has screened devices to get those with the best noise figures. I can believe that by going 2 sigma out on the distribution curve that it's possible to get an En that is 50% that of typical. If they used 2SJ74/2SK170 devices and paralleled them they might get En down below 0.1 nV/sqrt(Hz), which is approximately what they would need to get ~95 dB SNR for 500 uV. BTW, I am assuming the 500 uV is applied at 1.0 KHz. Does anyone know for sure?

Maybe just the A weighed measurement filtering effect? ''S/N比（IHF-A補正）''.

tiefbassuebertr · 19th April 2011, 08:44 AM

Is this model really extremly rare ?

leejr · 28th April 2011, 06:07 PM

I have never seen one in the States. In fact I have never seen an advertisement for one of these. I am going to do some research.

24th February 2010, 10:10 AM	#2
Steerpike diyAudio Member Join Date: Jan 2006 Location: Johannesburg, South Africa	Never seen that before. The MC noise figure is quite impressive. __________________ Steerpike's Toybox

6th March 2010, 07:11 AM	#3
analog_guy diyAudio Member Join Date: Apr 2007	MC SNR Figures The manufacturer either has access to lower noise transistors than I have seen or has screened devices to get those with the best noise figures. I can believe that by going 2 sigma out on the distribution curve that it's possible to get an En that is 50% that of typical. If they used 2SJ74/2SK170 devices and paralleled them they might get En down below 0.1 nV/sqrt(Hz), which is approximately what they would need to get ~95 dB SNR for 500 uV. BTW, I am assuming the 500 uV is applied at 1.0 KHz. Does anyone know for sure? __________________ JCM

7th March 2010, 10:40 PM	#5
analog_guy diyAudio Member Join Date: Apr 2007	Transistor Type in Yahama MC Amp Uli, Thanks for the additional information. Do you know what the parameteic differences are between those transistors and the 2SJ74/2SK170? Also, it would be interesting to get SPICE models for the devices Yahama is using. __________________ JCM

19th April 2011, 08:44 AM	#7
tiefbassuebertr diyAudio Member Join Date: Jul 2005 Location: D-55629 Schwarzerden	The same Question again: Who have heard Yamaha HX-10000 ?? Is this model really extremly rare ?

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28th April 2011, 06:07 PM	#8
leejr diyAudio Member Join Date: Apr 2011 Location: Yorktown Virginia	I have never seen one in the States. In fact I have never seen an advertisement for one of these. I am going to do some research.

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