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Old 25th September 2012, 11:07 AM   #1
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Join Date: Dec 2007
Default MY PARADISE

Just bit an pieces of my Paradise Build
I don't want to spoil the MPP tread with my stuff as I am definetley not an expert (first time I build sometink so coplex with discretes)


I have already the V2 running and is so good that I wanted to make a second one with the new revised boards

This will give me the opportunity to fiddle with it.

So V3 will be built almost to speck and later I will use existing boards to change components and make back to back listening test.

In the mean time I have been working on the pre-regulator boards.

I have tried same R cores from Selectronic.
I have to say I was a bit disappointed as having ordered 50 VA 24 24 V they sent me 30 VA by mistake
They where quite good as they sent the replacement 50 VA free of charge
So now I am lucky owner of 2 of each

But maybe not so lucky as the AC output is not the 24 V I was expecting

I have on no load conditions 33.7 and 33.6 VAC from the 30 VA
And 31.15 and 30.89 Vac from the 50 VA

This X 1.471 give me 49 V DC with no load of the 30 VA units and drop to about 45 with 150 mA load so far to much for paradise.

It is possible to take a few turns off from the windings due to the R core construction (but take a fair amount of time and patience) and reduce the Voltage output but why bother

So especially if you are in the UK with our nominal 240 V ac mains those are not recommended besides the 260 mV difference between the 2 secondary in one of the 50 VA is another indication of poor construction.

So I am going to use those for another project and going to order same different trafos
Attached Images
File Type: jpg Preregulator 001.jpg (976.8 KB, 1181 views)
File Type: jpg Preregulator 002.jpg (968.3 KB, 1101 views)
File Type: jpg Preregulator 003.jpg (975.4 KB, 1025 views)
File Type: jpg Preregulator 004.jpg (880.8 KB, 948 views)
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Old 25th September 2012, 11:36 PM   #2
AVWERK is offline AVWERK  United States
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When I purchased some R cores for the pearl 2 awhile back I had the same issues,., way off on their ratings of voltages. Way more than stated.
Is it too much trouble for these sellers to use a DVM and actually measure what they sell and be accurate for once??

Regards
David
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Old 25th September 2012, 11:52 PM   #3
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You can use a series resistor to drop the voltage or chokes that drop some voltage in their DC resistance. Too much is better then too little.
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Old 26th September 2012, 12:09 AM   #4
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Quote:
Originally Posted by AVWERK View Post
When I purchased some R cores for the pearl 2 awhile back I had the same issues,., way off on their ratings of voltages. Way more than stated.
Is it too much trouble for these sellers to use a DVM and actually measure what they sell and be accurate for once??

Regards
David
Tanks for confirming that I am not the only one having problems.

Altrought they may be in to specification in the continent where Ac voltagge is 230 V ac nominal.

Still the difference of voltagess between 2 secondary is the worst I have seen in a long time (260 mV)
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Old 26th September 2012, 12:19 AM   #5
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Quote:
Originally Posted by Joachim Gerhard View Post
You can use a series resistor to drop the voltage or chokes that drop some voltage in their DC resistance. Too much is better then too little.
Tanks Joachim

I have on it a Futaba 0.47R to split the large capacitor from the 2 FC 1800 uF
this can I supose go up to 4.7 Homs
Stiil 33 V ac out of a 24 V ac rated one is far to much at present (with 0.47R)
I get 42 V DC out under a 160 mA load

This is to much for Paradise as maximum Voltagge shuld be about 35 V
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Old 27th September 2012, 05:33 PM   #6
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OK increased the resistor between caps to 5 homs
Beta Paradise PSU boxed and ready to go
Attached Images
File Type: jpg Beta Pre-reg PSU 001.jpg (988.1 KB, 808 views)
File Type: jpg Beta Pre-reg PSU 004.jpg (980.3 KB, 417 views)
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Old 27th September 2012, 05:41 PM   #7
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Lucks pretty decent. Good luck !
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Old 27th September 2012, 06:04 PM   #8
kamis is offline kamis  Serbia
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Which brand and model is that blue colored DC connector?
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Old 27th September 2012, 06:25 PM   #9
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Bksabath View Post
OK increased the resistor between caps to 5 homs
Beta Paradise PSU boxed and ready to go
Verry nice I like it
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Old 27th September 2012, 06:51 PM   #10
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The Soket is from RS pno 297-6713
ITT 10 A 7 pole
I am using this one as I have already been using it in the past.(there is cheaper stuff out there)
The box is in Stainless Steel 304 grade NON magnetic.
Same for the Paradise Phono stage
Pain in the but to cut and drill and stick togheter even with captive nuts
I am going to get new one with folded sides so is going to need Just 4 screws instead of 60 (but then I will not be able to say I made it )

But at least now I know dimentions are prety right.

Just need my signature granite fronts to make it prety.
So now I got bench cleared up I can tidy up and back on Balanced tomorow

Last edited by Bksabath; 27th September 2012 at 06:56 PM.
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