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Old 20th February 2002, 02:07 PM   #1
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Default pearl phono

hi,
i am thinking that the pearl is only for mm or high output mc systems.the amplification is only 40 dB .i want to build in an additional stage like in the pass xono amp.but here are the caps c 37 and c 19 high caps 220 u and they are in the line.


Any comments for recommendations would be welcome

best regards

hsort
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Old 22nd February 2002, 11:13 AM   #2
joe is offline joe  Germany
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Hi,
if you need more gain and if you are already think about adding a extra gainstage from the Xono i would recommend to clone the Xono completely. Due to the RIAA-network in the feedbackloop of the Xono you will save 20db of total gain which may be an advantage. Otherwise you would need a gain of 80db at 20Hz which is quite a lot for a simple circuit. If you dont like the pushpull output stage i think one can try a single ended one in pearlstyle.

Or just use the pearl and a stepup-transfomer for the MC-stage. Expansive but easy. And there are a lot of people who really like transformers.

arndt
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Old 22nd February 2002, 11:51 AM   #3
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Hi Joe,
thanks for your answer.I need about 66- 70 db gain and i have simulated this circuit with 2SK 369 Fet's and a third Stage after the parallel fet's.I got too much gain.So i put in a feedbackloop like in the Xono , but here feeds a big cap the signal. The cap is also shunted by a small one ,but i think the best cap is not a electrolitic one.
My simulation programm is a student version and here are only 2SK 369 simulated.Perhaps the problem is no ones , when i build the circuit with the original 2 SK 170, which have less gain.
The Pearl circuit is charming for me , because i need only a few parts.
I see you live also in Germany and i appreciated mailing me private.
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Old 22nd February 2002, 12:37 PM   #4
arnach is offline arnach  United States
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Default Xono

I'm cloning the Xono now if you have any questions.

-- Aaron
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Old 2nd March 2002, 08:09 PM   #5
Jens is offline Jens  Germany
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arnach

I'm wondering if you have finished the PCB for your Xono? If yes, please send me a copy of the layout - thanks.

jens
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Old 2nd March 2002, 09:26 PM   #6
arnach is offline arnach  United States
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Default Hello

Hello,

I have not started them yet, but will gladly e-mail them to you when I do.

Right now I am focusing on specifiying and ordering all the parts.

I am using various different sizes of resistors and capacitors which will doubtfully be in the average parts library so I will need to be able to perform measurements on these parts so I can make my own entries in the schematic library.

I'm using Protel..

Thanks,

Aaron Finley
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