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Old 7th October 2012, 04:04 PM   #7521
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Tanks Joachim
I shuld have put this better, I do not imply design flaw, if this is not clear you and any naive reader have my apologies.

Just jumping the gun realy as I am thinking about next build with 1% resistors and limited suply of Jfets.

Last edited by Bksabath; 7th October 2012 at 04:06 PM.
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Old 7th October 2012, 04:41 PM   #7522
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Did you build with resistors that do not have 1% tolerance !
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Old 8th October 2012, 09:38 AM   #7523
hesener is offline hesener  Germany
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Quote:
Originally Posted by Algar_emi View Post
Hi. Since the official R3 PCB was no longer available, I did my own
I also did a pcb for the pre-reg according to the included schematic. I should have them built by the end of the day.
The latest version of the parts list match these PCB.
Very cool!! I like it. Sorry you couldnt participate in the group buy.... In fact, we have 3-4 people on the waiting list so that may eventually lead to another group buy, unless you would like to do one with yours?
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Old 8th October 2012, 07:38 PM   #7524
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I assembled and tested the Pre-Reg PCB. There was an error that is now corrected. Output voltage is around 31V at 120ma supply current. I find it a little on the high side for the preamp shunt reg (35Vmax to 25Vmin recommended). In order to lower the heat dissipation of the shunt reg, I did a simple RC PCB (forming a CRC filter with the caps on the preamp). It is intended to be installed between both preamp pcb. It will lower the pre-reg supply to about 28V, adding some more filtering in the process. I did it using parts I had in stock, nothing fancy. I modified to BOM to add these parts.
Attached Images
File Type: jpg Paradise_Pre-Reg_SB-version.jpg (104.6 KB, 398 views)
File Type: jpg RC_Filter_PCB.jpg (127.9 KB, 393 views)
Attached Files
File Type: zip Paradise_Parts_List_small.zip (11.5 KB, 44 views)
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Old 8th October 2012, 08:53 PM   #7525
RCruz is offline RCruz  Switzerland
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Hi Algar

Do you use 0.1uF caps to bypass the rectifier diodes or did you plan snubbers ?
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Old 9th October 2012, 04:20 PM   #7526
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The Hammond transformers are now coming in from Digikey.
i have now all parts to build a Paradise pre regulator.
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Old 10th October 2012, 04:51 AM   #7527
uli67 is offline uli67  Germany
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Hello Joachim,
i'm looking forward, to your preregulator and I hope it will come soon.
Today evenig we had a listening session by Andrejs with your
proto-paradise V2

.... very impressive....

especially with his great BB-OB setup and other specialities.

i´m so happy that I appointed three sets

Greatings from Münster
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Old 10th October 2012, 01:54 PM   #7528
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Thanks Uli, Andrejs also told me that he gets very good results.
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Old 10th October 2012, 08:01 PM   #7529
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Hi Joachim

is there a line amp and a power amp(DIY) that fits to the qualities of the Paradise phono amp?

Thanks
Roland
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Old 10th October 2012, 08:15 PM   #7530
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I have posted that before. The Rose and a fitting power buffer. Have to find it though.
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