Fidelity Research FR-64x

Voltage amp current amp who cares? And none of this has anything to do with gain. I don't need answers from the manufacturer or that thread, I haven't lost my mind yet.

Feeding a signal from source to amp through a volume control pot will massively attenuate and distort it. You'll have a major impedance problem. Source output will be bastardized in different manner depending where the volume is set. Things such as cables will have a tremendous negative impact.

Dynamic range will take a crap. There will be no sense of drive. A $10 receiver from the thrift store will sound better. 

Forget about your gain, we use phono preamps as a source with super efficient speakers, all we actually need is a volume control between phono preamp and power amp, if there is no impedance mismatch. I use a buffer (with volume control) to avoid impedance mismatch, but people who uses LightSpeed Attenuator are not stupid.

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.