PC Rules

04-20-11: Orpheus10
The computer is in the basement, and the listening room is upstairs. I recorded the LP through an Audiolab 8000-C pre to line in of computer interface. I added this to my playlist. After that, I took the TT upstairs to phono of Audible Illusions. The computer comes to tape in of Audible Illusions. The TT was cued in at the beginning of the same LP that was being played back from the playlist. I could switch back and forth between the phono and tape, this allowed me to make a very good comparison. The difference was striking; record noise was audible from the TT, but none from the playback.

The obvious interpretation of all of this seems to me to be that you've proven (at most) that by changing phono stages (and perhaps cartridge loading as well), and simultaneously introducing a particular a/d converter circuit and a particular d/a converter circuit into the signal path, you've modified the sound so as to reduce "record noise" and make the overall sound quality subjectively preferable to you, in your particular system.

Nothing more.

But perhaps less, considering that the turntable was not only moved, but was exposed to the sound from your main speakers during the A/B comparison while not being similarly exposed during the ripping process; there may have been differences in its support and leveling, as Onhwy61 noted; and there conceivably could have been other relevant differences in rfi/emi, cabling, ground-loop related noise, power distribution, etc.

As I see it, the changed phono stage in itself invalidates the "PC Rules" conclusion, not to mention all of the other variables that were involved.

Regards,
-- Al

Onhwy61, if you use noise reduction equipment, the copy is better. If you record to 1/2 track tape, the copy is better.

When you use a phono pre, the pre is making a new copy from the cartridge; each phono pre is different, what sound is the original sound? Every time you change equipment, you get a different sound, which sound is the original sound?

"ITS EASIER TO DESPISE WHAT YOU CANNOT GET"
Actually for some its easier to argue what you cannot and will not prove than it is to accept the fault in your logic.

The fox had the perception of sour grapes in your story, although he could not proove it. Where as the vinyard took those grapes and put them thru a first pressing and the community drank wine.
Cheers

I encountered a hum problem when I went "phono in". That will require complete disassembly and a new modification. This will take a day.