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Batteries allow you to get rid of the electrolytics

As always, depends on your intent, but one of the main benefits of a battery supply, in my opinion and experience, is to banish all of those irritating electrolytic capacitors to the parts bin. If you can, try the battery with just a good sounding film capacitor(s) at the circuit connection point to minimize connection impedance affects. Provided the rest of the circuit is free of bad sounding capacitors, you may be surprised. "Fast" power supplies are really only needed for unstable audio circuits using lots of feedback. Look at the schematic of a good sounding tube preamp sometime. The big electrolytics of common solid state gear are replaced by the copper windings and magnetic circuit of a choke, along with a small amount of quality film caps. And the sound is much better for it.

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