Pearl phono PCBs Group Buy

[tschrama]

Nope, sorry no photo's. My girlfriend won't let me use her dig cammera... they are in a old showbox .. 'vanBommel' full brooks .. i didn't have anything else .. .. ... but I did finish my Pearl with your boards and components. They sound wonderfull.. really nice wide and defined spatiality... lovely to listen to... thanks!

 

[FrankDIY]

I will probably use an Hammond aluminum enclosure (painted black) with a 1/4'' home made face plate.

I found my power connector: 6 pins neutrik (kind of XLR type).

 

[promitheus]

A lot of people are asking me about the ground connections.

You only have to solder the small wire connection on the top side.
All grounds that dont make any connection on the bottom side are connected on the top layer to the ground plane.

 

[rmihai]

I am in. Keep me posted.

 

[promitheus]

Hello,

I am designing an improved high end power supply for the Pearl.
I will use a discrete diode bridge with bypass capacitors as well a bypass capacitor of 1uF across the Electrolytic snap in cap.
Any other suggestions?

I will post a photo of the layout as soon as I have a ready version.

 

[Ralphono]

Hello,

I am designing an improved high end power supply for the Pearl.
ready version.

Hope it´s worth it. Half of the parts on the Pearl Phono Board seem to be used as power supply.

Did you hear a difference?

 

[Tarasque]

Hi promitheus


Would you have some boards left?
I could use 2 boards

Thanks

 

[hueser]

Pearl Phono

Hi

I want to sell my Pearl Phono. Anyone interested ? Photos and description on www.passdiy.com.

http://www.passdiy.com/gallery/pearl-p3.htm

More pictures by email. Would prefer to sell within Europe.

Marc

 

[promitheus]

Tarasque
send me an email and then I can give you more information.

 

[xavier1000]

Hi promitheus


I would also be interested in getting some boards if you still have any. I've just sent you an email.

Thanks
Xavier

 

[promitheus]

This is the new power supply boards I ordered.
You can see it real size in the pdf.
It has discrete diodes for the bridge with caps across them and a bypass MKP Mundorf Cap across the Snap in Cap.

 

[naz]

promitheus,

Hey what parts are you using for the new psu board and could you post the layout possibly? It's simple enough that I might just build them myself if thats ok? I'm almost done with my Pearl.. it's some wonderfully nice parts and very nice boards thanks for all the hard work.

Naz

 

[promitheus]

Diodes you can start from 1N4007 or go to more exotic Schottky diodes.
Across them I will use WIMA 100nF Caps with RM 7,5.
The big snap in cap is the original 10 000uF Cap and across that I will be using a Mundorf 1uF MCap. But you can use any good Polypropylen Cap.

 

[promitheus]

For those who have ordered boards for the PSU I just wanted to say that they will come next week.
I will post more info and photos when I get them.

 

[promitheus]

I just got the new PSU boards for the Pearl.
A discrete rectifier bridge can be used with caps across the diodes and an MKP MCap Mundorf on the output.
In the picture you can see the Board with the big Panasonic snap in on it.

 

[promitheus]

Hey NAZ did you finish your Pearl?
Any pictures yet?

 

[naz]

promitheus,

I have it mostly finished. I'm still trying to get the chassis all done, it's going in a case with a balanced zen line stage that I had previously built. Mostly I need to bug my friend about getting around to machining my knobs and connecting shafts for me.

Naz

 

[promitheus]

what kind of chassis are you using?
I am still trying to think something out.

 

[xavier1000]

I just got the PCB and parts. The PCB looks really good and the components are matched, labeled and classifyed in different bags.

Thanks promitheus for your effort!

I will start working this weekend.

Xavier

 

[xavier1000]

MC cartridge+pearl: additional input or output stage?

I have an MC cartridge (Shelter 901, 0.5 mV). The phonostage I'm currently using has a gain of 62 dB.

After searching other threads, I saw several recomendations for adding an additional stage before the input, just replicating the first gain stage (4 jfets in parallel and a cascode transistor). But after reviewing the THD curves, I came to the conclusion that in order to have a gain of about 62 dB, I was getting a distortion bigger than 1%.

What I am finally planning to do is to add an additional stage but at the output instead of at the input so I stay in the optimal range of the Pearl phono stage according to Wayne's article. The circuit I plan to add is basically an Aleph P1.7 which has enough gain, can handle bigger signals and can easily generate a balanced output. If I use 1K for R19 then I have a gain of 48 dB for the
Pearl and then I only need a gain of 15dB for the P1.7.

I am quite ignorant so I would like to know if my reasonment is correct.

Do you guys think I will get better performance adding the additional stage at the output instead of adding it at the input?

Xavier