Simplistic NJFET RIAA

[RCruz]

Hi keantoken... what do you mean by glueing the record ?

[keantoken]

Coat the grooves with PVA glue (Titebond II), let it dry, then pry it off. PVA glue won't stick to vynil, but it will stick to everything else. To my knowledge no one has come up with a good reason not to use it.

AudioKarma.org Home Audio Stereo Discussion Forums - View Single Post - Wood Glue as Vinyl Cleaner

[RCruz]

Cool

[chalkandtalk]

What is the best way to arrange 0V connections?

I have two separate DC supplies (kept in a separate PSU case). The RIAA circuit is in it's own case with the shunt regs. Both cases are connected to earth. The catridge 0v wires connect to the 0V of each side of the RIAA.

Should 0V of each supply be connected? If so would it be best to connect them in the PSU after (or maybe before) the smoothing caps?

Should the earth wire from the deck be connected to mains earth and the common 0V connection?

Thanks for your help.

[Salas]

I usually reference the regulators to their box at their 0 Force out points. I usually connect the TT ground wire to a non insulated post on the box which is grounded itself. I have seen in two box builds that best hum performance may vary for best grounding scheme depending on how the circuit segments are separated and boxed. I usually try a few schemes when watching harmonic noise on the FFT.

[chalkandtalk]

Thanks Salas. I'll go with that.

The wiring in the Rock needs serious attention, but there is progress.

[Salas]

Did you build the pre pre section by now also?

[chalkandtalk]

I rebuilt the RIAA stages - some resistors and cap changes were't too dificult to do as it was constructed point to point mainly. The shunt regs now output 38V.

[keantoken]

I adjusted the VTF. I am amazed at how sensitive this adjustment is. I added a self-cleaning attachment for the pipe cleaner brush... When the tonearm swings off the record, the brush falls onto a pipe cleaner track and drags across it to the rest. This way the brush is cleaned automatically after each playing.

Unfortunately all my records seem to suffer from excess distortion at loud volumes. After glueing records, the quality starts to get near the youtube clips, imaging is usually better than youtube (but I guess that's no surprise). VTF adjustment was very important for the soundstage depth. I used "Pavanne (Gould)" from "Pops goes the trumpet".

I think I will try to make a recording. Unfortunately it will be using my soundblaster, which was a way overpriced rip-off. So it will probably be 48KHz 16-bit. I hope to get an M-audio 192 in the future.

[keantoken]

Hey guys. How does this sound?

Phonotest.wav

EDIT: Oops! It's "You are woman, I am man"

http://www.flickr.com/photos/23097960@N04/2487913337/