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.
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.
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.
Attachments
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.
Have you ever tried Jensen 4 poles ? IMO these permit great gains in trebble detail even when powering shunts.
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.
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.
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.
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 ?
I will try to find those talema coils... what values do you recommend ?
Another question from the fool;
should'nt we do some Pre-reg Boards for the poor in Wallet and mind ?
should'nt we do some Pre-reg Boards for the poor in Wallet and mind ?
Actualy you need 2 of those
I am making same new ones with some different cokes and extra one at output with 2 banks of capacitors.
Is not going to be this week as I got a 72 hour week so for now go back to FDW post.
I will post soon on the Paradise build tread
I am making same new ones with some different cokes and extra one at output with 2 banks of capacitors.
Is not going to be this week as I got a 72 hour week so for now go back to FDW post.
I will post soon on the Paradise build tread
I would probably build it P2P... no need for a pcb with such simple setup.
Joachim, why only a 100mH choke? I like these as an alternative to the prohibitively expensive Lundahls better.... Frag Jan zuerst- Ask Jan first: Roehren und mehr, the 10H 330R choke
Joachim, why only a 100mH choke? I like these as an alternative to the prohibitively expensive Lundahls better.... Frag Jan zuerst- Ask Jan first: Roehren und mehr, the 10H 330R choke
hello Stev,
one one hand,
you're absolute right.
On the other,
does a perfboard match with those red cuties ? 😉
one one hand,
you're absolute right.
On the other,
does a perfboard match with those red cuties ? 😉
Just a little sim.... with the Takema choke...
Actually better than I expected, even without any modelling of common-mode
Actually better than I expected, even without any modelling of common-mode
Last edited:
Actually the original design had the Talemas BEFORE the diode bridges to get rid of the HF/RF noise from the transformer. They can be used though in a conventional CLC pi filter like you did simulate. A bigger inductance is even better, sure, but they are inexpensive so good for experimenting with this technology.