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Weil 11th January 2002 07:24 PM

Pearl Phono PCBs
 
Hi,

Im new registrated.
I have Aleph Pre 1.7 and Aleph 5.
Now Im intrested in building the PearlPhono, but Im not electrical skilled.

Questions:
Where do I get PCBs ?
Do one need C14 + C16 and if so what effect on soundquality will result ?
Do I have to match the JFETs ? If yes, how many do I have to buy to get reasonable matching results ?

:confused: Wayne Colburn does not mention anything about the +/- 9V Battery supply ?? Is it not necessary ??

wayne 12th January 2002 09:23 PM

Pearl Phono Boards
 
The battery can be used as a reference instead of a 9.1 Volt Zener.

The Pc boards are available at passdiy.com

Wayne

hifi 17th January 2002 10:22 AM

when using the battery should the zener be removed??...isnt that used to lower the voltage?

wayne 17th January 2002 07:48 PM

Battery on Pearl
 
If using the battery the Zener is removed. This is the reference for the regulator differential amplifier.

Andrej Deticek 19th January 2002 08:44 PM

Battery advantage over Zener in Pearl?
 
Wayne,

Can you explain the possible advantage of a 9V reference battery over a 9.1 V Zener in a Pearl phono preamp, please? Any percieved sonic difference in a listening test?
I am about to build the Pearl phono and would like to know if it is worthwhile to provide space for the batteries.

Regards,

Andrej

GRollins 19th January 2002 10:02 PM

Batteries are very, very quiet. Obviously a nifty trait when one is trying to build a phono stage. The downside is that they have to be replaced every so often. Zeners are forever, but at the expense of some noise.
I've heard people say that batteries sound better, aside from the noise issue. I have no opinion on this. Perhaps Wayne will be able to say more.
Your choice.
You could, I suppose, have a switched voltage reference. Zener for daily use, and battery for serious listening.

Grey

wayne 19th January 2002 11:01 PM

Battery
 
The battery does give less measured noise. I didn't listen to it.
The Pearl could actually be powered by batteries as has been suggested.

Fritz 27th August 2002 02:00 AM

Pearl on Batteries
 
Im considering battery power for the Pearl and was wondering how much of the filter section should be retained either as filter or as current capacity. Would a series of 3 twelve volt batteries leading into pads 1& 2 work or could I just put 2 batteries before C15.


Im a bit concerned that housing the batteries distant from the circuit will allow the pick up of stray fields.

Is it likely that batteries will offer a significant advantage for a power supply in this application.

Im new to this so any advice would be helpful

wayne 28th August 2002 03:28 AM

The two batteries would allow you to eliminate the 9610 Mosfet and diff pair circuit. Charged batteries at 13 Volts would be a little low but work fine.

Buhl 22nd May 2005 11:40 AM

Pearl Battery voltage reference ?
 
If I choose to use the 9 volt battery instead of the zeners, how long time could I expect the batterys to last - is the current draw so small that I could expect once a year or so ?? What if the battery gets to old, and the voltage drops, how would it be heard ??


Cheers !
Hans


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