Paradise Builders

[MiiB]

You Can use a diode on the rails of the front end of a power amplifier where they can prevent the rails sagging if there's a big power draw..for class A circuits you want the constant current draw to form a R-C filter there diodes would chop of the currents in a not so desired way

 

[Nick77]

Trying to rid a little hum i am getting only once the cart hits the record. I can only hear it at about 3/4 volume plus but gets noisy after that.
I have a DCB1 without gain so i have to run the volume pretty high. If i disconnect the TT ground the hum increases dramatically.

Havent cased the PS yet, so there is no iec ground. RCA wire is Juniper with cotton, if that might be an issue? Any thoughts, otherwise sounds sweet!!

 

[RCruz]

Try moving the trafos away.... this is a 60 plus dB so it can amplify a lot

 

[FdW]

Trying to rid a little hum i am getting only once the cart hits the record. I can only hear it at about 3/4 volume plus but gets noisy after that.
I have a DCB1 without gain so i have to run the volume pretty high. If i disconnect the TT ground the hum increases dramatically.

Havent cased the PS yet, so there is no iec ground. RCA wire is Juniper with cotton, if that might be an issue? Any thoughts, otherwise sounds sweet!!

First move the transformers way out of the way Then have a good look at the grounding schema in the building guide

 

[Bksabath]

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?

 

[RollE2k]

Joachim Gerhard: How did it go with the balanced input stage for the Paradise?

 

[Joachim Gerhard]

It would need too many changes. We have a new thread now called " Masterpiece" where we do a balanced phono stage that has a lot of the Paradise genes.

 

[Joachim Gerhard]

Circuit of post 588 on the Masterpiece thread seems to be working.
I found what i think is a better buffer though so this is still a work in progress.

 

[Joachim Gerhard]

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

 

[jacco vermeulen]

the caps

KP72, very nice.
Are remakes of the Siemens B33051/61 film&foil series, but in an epoxy sealed plastic cannister.
[could be had 1% accurate up to 100Vdc, should tell something]

 

[Bksabath]

Posting here as attachment can not be sent by PM

But Frans did and posted much better ones....

 

[FdW]

See #7733

These are the most important/relevant messages regarding PSU and Pre-Reg.

1. Mpp #4375 PSU-pre-regulator.
2. Mpp #4610 V2 Schemas UPS and Amp.
3. Mpp #6506 CCS fine-tuning.
4. Mpp #6462 PSU with my notes.
5. Mpp #6809 Do not try to feed the CVS of the CCS of the shunt with a regulated power supply.
6. Mpp #7127 More about transformer selection.
7. Mpp #7635 Single and dual transformer wiring (also corrected drawing) (See also #7733).
8. Mpp #7733 Grounding (PSU, RIAA and Player).
9. Mpp #7810 35V PSU for the CroMagnon.
10. Mpp #7830 The PSU explained.
11. Mpp #8386 My resistor recommendation’s.
12. My Paradise #56 PSU Noise.
13. PradiseBuilders #13 Schema's and assembly guide.
14. PradiseBuilders #155 Vdc input voltage minimum simulated.
15. PradiseBuilders #970 PSU oscillates; posible solutions?
16. PradiseBuilders #983 Compensating the PSU for oscillations.
17. PradiseBuilders #1173 Fixing oscillations (up to #1182).
18. PradiseBuilders #1322 Fuse .
19. PradiseBuilders #1387 Updated Paradise R3 assembly guide (Also German).
20. PradiseBuilders #1403 Capacitors bad vs good.
21. PradiseBuilders #1593 PSU Power Transistor selection.
22. PradiseBuilders #1644 PSU Output Impedance.
23. PradiseBuilders #1680 PSU Power Supply Suppression Ratio(PSSR).
24. PradiseBuilders #1772 NJF selection for the PSU.
25. PradiseBuilders #1887 Empirical NJF Rgs determination.

Have a look at these and their following messages.

 

[hesener]

Trying to rid a little hum i am getting only once the cart hits the record. I can only hear it at about 3/4 volume plus but gets noisy after that.
I have a DCB1 without gain so i have to run the volume pretty high. If i disconnect the TT ground the hum increases dramatically.

Havent cased the PS yet, so there is no iec ground. RCA wire is Juniper with cotton, if that might be an issue? Any thoughts, otherwise sounds sweet!!

Hi Nick, from your pictures it seems that the metal chassis in wihch the phono preamps sit is not grounded. I think you should try to put a star ground between the input RCAs and connect the input grounds as well as TT ground there. If you want to do more, take some copper sheet metal, bend two "bathtubs" to go under the two PCBs, and connect those to the star ground as well (but otherwise they should be isolated).

hope that helps.....

 

[pdul]

which details of the paradise are mainly responsible for the micro details in the sound?
I have just compared my old preamp to the paradise, and the paradise is clean, and generally good sounding, and as close to noiseless as anyone can wish for.
The old input (Marshall Leach) has some hiss when crancked up, but at the same time it sounds like theres a lot more micro details in the sound (more hole through) Both have the same load resistors. Do anyone have some input on this?

 

[pdul]

could it be the paralelling of the input transistors that cancels out something besides noise? The old input only has one pair of the famous Rohm`s 2sb737/2sd786

 

[Joachim Gerhard]

That is history, ALL super low Rbb are extinct. Even Renaisas stopped to make them.
We had an argument about this on the Masterpiece thread.

 

[pdul]

I was just wondering what is eating the micro details?

 

[Joachim Gerhard]

My experience is that sound quality is not worse with an array of transistors. Most other designers have the same problem anyway. Accuphase, Constellation, Audio Research,
you name it. The Leach has around 100x more distortion. Harmonic distortion, especially 3rd that the Leach has can sound crispy and open.
Why the Paradise sounds as it sounds has being explained by me many times.
Sorry, pdul, i really like your presence here but i get a bit tired about that.

 

[pdul]

Thank you for the answer, and i will try not to tire you further.

 

[Nick77]

Hi Nick, from your pictures it seems that the metal chassis in wihch the phono preamps sit is not grounded. I think you should try to put a star ground between the input RCAs and connect the input grounds as well as TT ground there. If you want to do more, take some copper sheet metal, bend two "bathtubs" to go under the two PCBs, and connect those to the star ground as well (but otherwise they should be isolated).

hope that helps.....

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