Fidelity Research FR-64x

@invictus005

Nelson doesn't sell passive preamps nor makes them. He only sells active preamps. B1 buffer was meant for DIY amateurs. People who actually design circuits laugh at passive preamps.

Are you talking about Nelson Pass new stuff?
You should know that he makes 100 units of whatever model and then it’s out of production. Each model is different all the time. All his stuff available for DIY community, he provides all info for DIYers. So ALL his amps can be made by DIYers including B1 or any super expensive models of power amps etc, but i have the originals made by Nelson Pass.

Remember Pass Labs ALEPH L ?
Two different versions were made, first one was 100% passive, second version was a combination of passive + active circuit. The active has been used ONLY when you need it, so the last Aleph L became active depends on the position of the volume control knob.

It seems like you don’t understand that there is no universal solution, everything depends on our systems. You, like Raul, pretends on absolute opinion, that’s very bad!

@rauliruegas 

Because you have a different P2S mount distance. Try this: forgeret about the Sony protrcator and mount the PUA 7 at 235mm from the spindle and your Feickert protractor will works with any alignment you want.  

That's was my point from the start to tell you that SONY PUA-7 geometry is unique, the pivot to spindle distance is about 221mm and special template provided with the arm to set it up like that. It's was off from well know 3 alignment methods and we're talking about big difference. 

You see 221mm and 235mm is not the same, it's a bid difference. 

What makes SONY corporation develope their own protractor if they could stick to the old Baerwald? 

@chakster When it comes to passive preamps, there is an absolute, they’re laughably bad! Think it through, it’s a simple Ohm’s law. You want low source output impedance (<200R) and high amp input impedance (>10K). So what happens when you put a 10K, 50K, 100K pot in between? Hint, 10K pot will wreak less havoc than 100K pot. And unless the 10K pot is completely open, it will create progressively a bigger impedance mismatch as it’s turned down. It’s a nightmare scenario.

On top of that, even minor capacitance in the pF region in cables, parasitic, etc. will significantly attenuate high frequencies.

And further, the pot will dominate the sound/noise quality. Wiper pots are very noisy.

And your current induced noise will go up drastically. Using this between a phono preamp and amp is beyond dumb.

With a passive preamp, you’re taking a high quality source component and a high quality amp and turning them both to complete garbage.

Universal solution is a competent active preamplifier.

Dear @chakster : Your Sony tonearm normally was coming integrated to the Sony TT PSX series ( 70,60,50. ) and that’s why came with that protractor. It’s really weird to find out a stand alone unit like yours.

You can try 235mm on P2S distance and listen which P2S mount like you more.

Btw:  """  like Raul, pretends on absolute opinion ..""". Sorry you look me that way. My opinion is only an opinion and nothing more. It's like yours or every one else.

R.

It's always funny when you guys can comment on something you never owned, that's the quietest amp combo i have ever heard with the highest resolution ever, killer dynamics, it's pretty real presentation. But you're talking about noise and Raul is always about distortion. 

I believe Nelson Pass knows his stuff!