Mpp

[Joachim Gerhard]

Fine, i check that out.

[sampler]

If we go with 2 x 2SA1085 plus 2 x 2SC2547 on inputs we are looking at about 0.3 nV/rtHz input noise at 1KHz plus 3dB penalty from balanced. Won't compromising this En at inputs with cabling and layout/shielding will be major challenge anyway so I personally can live with that additional 3dB of noise by simply taking one output. The real beauty of this masterpiece is that we already have 93dB common mode rejection at 50Hz to start with for bjt version. In sims 0.28mVpp common mode at inputs produces only 0.096mVpp at outputs, while differentially it gives 4.32Vpp, hence ratio of 44906 or ~93dB. I'm saying this loud as there is not much consistency describing CMR even in op amps datasheets. This is a really nice bonus we get for floating common emitters. Fet version numbers are sky rocking because of higher input independence and floating sources too. Ok, this is in sims, it will deteriorate in real build from mismatches but we get a picture, so se outputs are not so compromised as in case with two completely separate stages running balanced in. #5169 converter looks really good. That can be put on pcb too, making it recommended for bjt version and optional for those who want to have it all in fet version. Multi purpose pads for input bjt's is a good idea too, just 1 additional hole like in multimeter hfe measuring connector would do the job.

[Joachim Gerhard]

This are beautiful numbers ! Sure, we only get the benefit with heavy shielding and good cabling plus matching to 0.1%. With the ultra low Rbe`devices noise is not a problem. Thanks for approving on my balanced-unbalanced converter. The LME49713 is a very good sounding part.
I somebody does not like an opamp in the chain using only one output does the job too.

[RCruz]

Originally Posted by hesener

that arrangement is correct

Thank you for the confirmation.

[RCruz]

Originally Posted by Joachim Gerhard

This are beautiful numbers ! Sure, we only get the benefit with heavy shielding and good cabling plus matching to 0.1%. With the ultra low Rbe`devices noise is not a problem. Thanks for approving on my balanced-unbalanced converter. The LME49713 is a very good sounding part.
I somebody does not like an opamp in the chain using only one output does the job too.

Incredible specs from those LME49713 (1900V/us slew....1.9nV/ √ ^Hz (typ) noise)

[Joachim Gerhard]

Yes, that Opamp got it bad and that is good.

[Bksabath]

Originally Posted by Joachim Gerhard

Yes, that Opamp got it bad and that is good.

I was wondering if the LME49713 has same hidden problems like the LT1028 for which the data sheet state a very low voltage noise but glide a bit over the poor current noise.

I am still paying full attention to the progress with the Paradise any updates / developments. When could we get a PCB for it?

About the Masterpiece and your earlier mention to same reference tracks
Masterpiece by the Temptations is a pretty good Album (STML11229)
Recorded in 1973 so free from too much electronic processing.
In one of the tracks the band is hand clapping and as this was done on a single take (everybody playing at same time) stage position of the band members is pretty well defined (It is actually so good that with decent stage one can tell how tall the band members are).

Maybe this could be a pretty good indicator of Phase shifts taking place on the Preamplifier that would compromise the tri dimensional stage.
The Temptations - Law Of The Land - YouTube

ON Ofset Iwas wondering if is possible to Offset the Offset by ofsetting the suply voltages.

I had a LAC powered MC stage and (bateries don't charge evenly) I was using a buffer to get the 0V virtual ground....(got stuck here I know a bit more about music than electronics)

[jackinnj]

Input bias current of the CFB LME49713 is 1.8uA -- the first data sheet had more examples -- the second only comments on Rf in that an optimal value is 1.2k. Regrettably, in an effort to clean up I threw away the first data sheet!

[Joachim Gerhard]

Bksabath, the LME49713 is dead quiet in this application. We do not use it as the MC pre-pre input but at the output of a phono stage at line level. My current privat phono stage has that chip at the output and i have listened to it just yesterday. Yes, the LT1028 is best for low impedance use but of totally different design then the LME49713. There is also a time gap of over 20 years between this critters and technology has moved on.
Yes, i love the Temptations.
The DC offset problem will be solved.

[Joachim Gerhard]

After Hesener has returned to home and has instructions ready we can start the group buy. The circuit has already proven to work. Only the final trimming of the RIAA has to be decided on, so Ricardo has to finish his Paradise. He and Sampler are our RIAA precision
experts.