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Old 2nd September 2012, 09:23 PM   #7161
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We discussed that before. A big transformer does no harm besides the possibility to couple more HF, RF into the circuit then a smaller one. Others claim that big transformers have more slam and grunt.
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Old 2nd September 2012, 09:25 PM   #7162
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Quote:
Originally Posted by Joachim Gerhard View Post
We discussed that before. A big transformer does no harm besides the possibility to couple more HF, RF into the circuit then a smaller one. Others claim that big transformers have more slam and grunt.
Ok thanks
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Old 3rd September 2012, 03:31 AM   #7163
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Quote:
Originally Posted by Holger Barske View Post
I will have to get rid of 30 Volts with an passive LCLCLC thing.
yikes.
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Old 3rd September 2012, 05:20 AM   #7164
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Holger, something like this :AQvox-Tuning | Holger Barske
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Old 3rd September 2012, 05:31 AM   #7165
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I have shown it several times but for the new comers here it is again:
I use the Preregulator from my Opus Magnum Phono Stage.
Because Block does not have 2 x 24V transformers i use 2 x 2 x 12V per side where i put the windings in series. The diode bridges are IXIS Silicon Carbide snubbert with REL teflon caps. The 10.000uF caps are slit foils, today i would use Mundorf 4 pole. The common mode chokes are from Lundahl. Loaded, the supply puts out plus-minus 30V, the maximum i recommend for the Paradise R3.
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File Type: jpg Opus Magnum Prereg.jpg (526.1 KB, 210 views)
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Old 3rd September 2012, 06:37 AM   #7166
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Fantastic prereg... it must provide really good dc for the shunts.

Have you ever tried Jensen 4 poles ? IMO these permit great gains in trebble detail even when powering shunts.
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Old 3rd September 2012, 06:44 AM   #7167
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No, i use Mundorf, mainly because i have a long busyness relationship to those guys and they are very helpful and friendly. I found the Mundorf 4 pole major in dynamics. I also use them in my power amp and the difference they made was huge. Especially in the bass.
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Old 3rd September 2012, 06:46 AM   #7168
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Some time ago i posted some measurement i made on my prereg. The waveform before the common mode coils looked like a skewed triangle and after the coils it was much smoother. I really recommend a coil solution.
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Old 3rd September 2012, 06:48 AM   #7169
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On the right side of the top Lundahl coil, in the cast cabinet you can see my low cost pre regulator. It uses Talema ferrite coils. The Lundahls are very expensive.
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Old 3rd September 2012, 07:05 AM   #7170
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They really look splendid these Lundahl... it is normal they have a high price tag

I will try to find those talema coils... what values do you recommend ?
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