Fidelity Research FR-64x

Dear @chakster : Own geometry? where do you read that or whom tell you?. Sony is a japanese manufacturer and used Stevenson A alignment. There is no " dedicated " protractor for it, the one you have is a protractor where the manufacturer gaves to the customers but northing special.

Stevenson A is what you have there.

Again, I know you are not stupid but only with high ignorance level on that regards and because you are not stupid you always can learn. So do it !

Btw, which kind of question is that: " ave you ever read Stevenson’s explanation about his method ? """

please learn for you can’t make any more that kind of questions. If you don’t learn then you will cross that line of stupidity where some person here belongs. Take advantage that you are no there yet and do it a favor and learn or look for a good advisor/mentor/teacher in that alignment regards. I’m sure you can learn.

The only special-dedicated tonearm geometry/protractor I know is that one by SAT tonearm and with out any explanation yet by the manufacturer that alignment design was made it by ignorance.

@lewm, there are no " secrets " ( as you could think. ) about tonearm alignment subject only marketing that is bougth by people with not the rigth knowledge level on that regards.
You can use the 247mm/250mm Löfgren A/Baerwald on your tonearm with great success and better on what you have now, using the parameters I posted here somewhere. Even the ivelchev that's Löfgren A choice works just fine. Anything but Stevenson A !. At least you can try and if you don't like it just comeback.

R.

@chakster You go ahead and enjoy it! I'll just sit back and lol.

Sony PUA-7 does not fit to any alignments on my Feickert, so they use a different alignment for this tonearm. It is not Stevenson, Baerwald or Lofgren. If it was Stevenson then it must be dead on on Feickert’s Stevenson (with correct pivot to spindle distance), but it’s not. You know why? Because Sony protractor is different. I have the original one, not a printed copy or something. I know what i’m talking about, you’d better check it yourself in reality.

@invictus005 

You remind me a soft of the dudes Nelson Pass is talking about, here is a quote: 

So here we are in the New Millennium, and thanks to Tom Holman and THX we’ve got lots of gain in our electronics. More gain than some of us need or want. At least 10 db more.

Think of it this way: If you are running your volume control down around 9 o’clock, you are actually throwing away signal level so that a subsequent gain stage can make it back up.

Routinely DIYers opt to make themselves a “passive preamp” - just an input selector and a volume control.

What could be better? Hardly any noise or distortion added by these simple passive parts. No feedback, no worrying about what type of capacitors – just musical perfection.

And yet there are guys out there who don’t care for the result. “It sucks the life out of the music”, is a commonly heard refrain (really - I’m being serious here!). Maybe they are reacting psychologically to the need to turn the volume control up compared to an active preamp.

I suppose if I had to floor the accelerator to drive 55 mph, maybe I’d think the life was being sucked out of my driving. Then again, maybe I like 55. Nice and safe, good gas mileage…

Is impedance matching an issue? Passive volume controls do have to make a trade-off between input impedance and output impedance. If the input impedance is high, making the input to the volume control easy for the source to drive, then the output impedance is also high, possibly creating difficulty with the input impedance of the power amplifier. And vice versa: If your amplifier prefers low source impedance, then your signal source might have to look at low impedance in the volume control.... 

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.

R.