Shunt-regulated 24V DC Power Supply for Preamp Modules

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Hi,

I am using some vintage modules such as Neve, Audix and Audio Developments as preamp and they require +24 volt dc power supply. I am using LM317 series regulated p.s. to feed them. Now I want to upgrade them. Are there any designs which adopt the shunt regulated concept? Any information is greately appreciated! Thanks.
 
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