Battery Power Supply Yes_ or No_

I can share my experience with battery powering gear. With my CD player, a battery certainly lowered the noise floor but at the cost of decreased dynamics. This is most likely attributed to the battery being too small, not enough capacitance. A linear power supply works better here, at least until I get a larger, better battery. With my tube preamp buffer, it sounds much better on the same battery that wasn’t “good enough” for my CD player. It sounds better on that battery than the same linear power supply that makes my CD player sound best. Trying to relate this to your situation, the tube buffer is closer in function to the phono preamp than the phono preamp is to the CD player. The phono preamp isn’t the source, it’s a type of signal amplification just like my tube buffer (which by the way applies 9 dB of gain). I say give it a shot, if you know what you’re doing so you don’t accidentally fry a component, and see how it sounds. From experience and from what others have said, bigger batteries sound better in terms of dynamics. We’re talking 70 Ah or more. Yes, that’s like a car battery in size. Your mileage may vary and you may not need that much. I’m using 35 Ah for my tube preamp and it sounds great. The CD player obviously needs more. 

Why not hang a big cap across the battery? 

noromance.... what is the benefit of strapping a big cap do.  Please advise the logic or benefit of doing this?  

Hey, it’s Zipost! I need to give him a shout-out. Zipost was absolutely instrumental with integrating batteries into my system. Very knowledgeable. He even hand-built me some parts that I needed. My system has never sounded better! Thank you, thank you, thank you!

@zipost It was more of a rhetorical question seeking an answer than an answer itself. But wouldn't a capacitor increase the speed and recovery of the power supply?