Paradise Builders

[Joachim Gerhard]

Cool, one more success.

 

[Nick77]

The ground vire on the plug soket is it disconnected?

Noughty Noughty
Where is case ground? Star?
Both signal grounds connected (ground loop) and providing ground return for the lot trough your pre?

Thanks bro, you saved the day! Hum gone and only sweet music.

 

[Cobra2]

Hesener thanks for being so specific, hum cured.

No want for micro details here, I have never heard so much resolution with analog before. I had a pair of Riken in the input that didnt work well at all but switching to a quiet PRP metal film solved that. Diana never sounded SOO good. I am very pleased outcome, thank you!

Paradise Phono pre
Sony PS-X70 Yamaha MC-1
Hottrodded DCB1
ClassD Audio SDS254
Wayne Parham Pi4 Speakers
-

Nice tt!
Sony PS-X70 on thevintageknob.org

Arne K

 

[RCruz]

I have being asked how a balanced output can be added to the Paradise. Unfortunately i have no idea for a simple modification but what works very well is this :
THAT Corporation 1606/1646 OutSmarts Balanced Line Driver ICs

Can a ssm2141 differential chip be used in the input to make a balanced input for a riaa preamp ?

 

[FdW]

All those green lights, from now on it will be Christmas every day, happy Christmas Nick77 it looks good

 

[Salas]

Nick, are the pi cabs with pro drivers extending enough in the bass when on the floor hard against the front wall?

 

[Nick77]

Nick, are the pi cabs with pro drivers extending enough in the bass when on the floor hard against the front wall?

I have the upgraded JBL 2226 driver and yes when sitting on the floor the bass is quite adequate. But they sound there best when up off the ground 15" or so. I only have them sitting on a false base about 4" and they sound great and run them with out a sub 90% of the time.
Recent build pic.

 

[Salas]

Nice color scheme. Maybe they can hang off the ceiling and still throw the right way if upside down.

 

[jacco vermeulen]

tt!

See Sony patent 3918722

 

[Joachim Gerhard]

No, RC, The SSM is much to noisy.
Some of the Burr-Brown INAs can do that.

 

[Joachim Gerhard]

Here is an example based on the INA163 :
Calvin-phono/PlatINA en - calvins-audio-pages

 

[RCruz]

Thank you JG

Is INA163 a fet imput device ?

 

[Joachim Gerhard]

I do not think so, it is BJT.

 

[Bksabath]

Hi Riccardo I have posted a while ago my LT1028 balanced
Maybe Joachim remembers?
Using complete INA limit resistor value choice? 3 K and 6 K for 163 while discrete 3 LT1028 alowd for much lower values.
Worth looking at FDW balanced ?(yes I know I need to get back to it SORRY is not forgotten)

 

[RCruz]

Good post.... you read my mind... there might be limitations due to INA input imp

Is LT1028 jfet input opamp ?

Can you find your post about the balanced input ?

 

[jacco vermeulen]

Ricardo,

noise figures in the order of 1nV/√Hz or lower are achievable only with bipolar input.

 

[FdW]

Worth looking at FDW balanced ?(yes I know I need to get back to it SORRY is not forgotten)

Why the question mark, and where are the listening reports?
http://www.diyaudio.com/forums/analogue-source/165603-balanced-input-all-dc-coupled-riaa-preamp.html

 

[Bksabath]

Long time ago here a couple of preliminary drawing (I am sure you can do better than me)

One is Split passive and did run for couple of years try ed AD797 but was a bit to metallic
second was going to be, till I got infected by MPP and decided to try and learn sumthink about transistors, tanks so much, to late now to realize that Public forum is not right place.

LT1028 is BJT low noise voltage wise Current wise noise is sort of forget to mention it so data sheet looks better .

But said before Frans got better...

Cant promise much all old file are in secret puter never connected to intra web at present in the loft untouched for quite a while

 

[jacco vermeulen]

Why the same opamp for the differential gain stage ?

 

[RCruz]

Thank you. Two servos and riaa filter around feedback loop.... not my piece of cake but invaluable info nontheless regarding balanced topology