Simplistic NJFET RIAA

[Salas]

Originally Posted by SGregory

DT, this is a worth while build. I learned more on this build, thanks to Salas et. al. than I have on any other build. Especially in the measureing department. Precision is critical. The results are spectacular.

I will share my final graphs for a while, as I am going to listen now. Both channels are now version 2 of the pc board. The transformer and PS Filter are mounted on an external breadboard till I make a chassis.

Plots are 1Vrms = 0dBs.

Left = Blue Right = Red.
0mV and 0.3mV 1kHz
RIAA response graph. (Could not get more matched)

Also threw a few photos of my sanctuary. Needs a cleaning now.

P.S. If you notice the chassis is almost empty now.... Enough room for a version 1.2 Shunt Regulator

Excellent. You wouldn't wait for the R-Core after all.

*You could try those filter curves taken without the correction file too. Not sure how they tie when the card goes at low dB. If they were plus 1dB off in the highs it would have been subjectively very annoying too. You should centre the curves on the plot at 1kHz not 20Hz, as well. They normally deviate both sides edges where the card wimps out a bit.

[SGregory]

R core will fit perfectly well in the PSU enclosure. I didn't want to split the chassis initially as I was waiting for the Ultimate RIAA to do that with. This is pretty close, I won't be shopping for a while.

Listening to a 1/2 Mastered version of Weather Report 8:30 live from Tokyo. I am about in the 5th row center. The sax was walking across the stage during a solo.

The system is pretty flat from about 20 to 20k with the MAudio. Another reason I stayed with it.

[Salas]

Some vinyl through this contraption can be quite eerie sometimes. I have some Zappa with the London Symphony, can take you aback.

[Salas]

Originally Posted by SGregory

I didn't want to split the chassis initially as I was waiting for the Ultimate RIAA to do that with. This is pretty close, I won't be shopping for a while.

You look keen on it, so put a brick where the toroid was, run in the cart a bit by going through some great vinyl performances, play with the TT and arm set up along the way. Now the teaser line: V1.2s open it up 20% further when conservatively speaking. OK I am off now!

[SGregory]

!!!

[DualTriode]

Hello,

Originally Posted by SGregory

DT, this is a worth while build. I learned more on this build, thanks to Salas et. al. than I have on any other build. Especially in the measureing department. Precision is critical. The results are spectacular.


Also threw a few photos of my sanctuary. Needs a cleaning now.

The measuring department is half the attraction. I have a new to me bench courtesy of UC Davis surplus store, Pete Millett sound card interface, computer and Audio Tester 3.0 ready to go.
This seems like the project and good people to develop the tools and skills with.
I just swapped out metalized PP capacitors in the tube line buffer for Russian NOS Paper In Oil. Take Five never sounded so good!
DT
All just for fun!

[nicoch58]

SGregory nice work , eddy current trick

[SGregory]

Nicoch46 so where did your line-out go? Is it now wireless;->

Salas,
Would my current set-up with the now seperated PS benefit from a small buffer Cap on the shunt reg? I was thinking like a 4.7uF PP on the 52V DC in?

[Salas]

It could, but I would just use up to 100n fast one.

[SGregory]

I have those K71 teflons that may be a good home.