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In Reply to: Need advise about Power Supply.. posted by Jose Garcia on May 5, 2007 at 20:27:09:
Hola José.The quietest kind of supply for a phono stage would probably be batteries; to get +/- 24 VDC you'd probably need three on each side, hooked up in series, with a common 0 VDC point (connected to GND.)
It'd probably be a somewhat large initial expense, but I expect that once you've got it going it should work well: a phono stage shouldn't consume much. Furthermore, when the batteries start going south you can just leave them recharging overnight.
Just a wild thought.
Follow Ups:
That's a very good suggestion, Damian. Two per side (12V x 2= 24V) would do it, although it might be expensive. According to Jose, his phono stage draws half an amp, so it wouldn't deplete the batteries too quickly, as long as they're fairly large.I'm eventually going use a rechargeable Optima deep cycle marine type battery for the filament supply on my tube preamp. I have the luxury of my garage bordering my listening room, so the toxic/explosive gasses during recharging won't be a problem.
These things run between $175 and $250 each, depending on model, so you'd need deep pockets for four of them. You're right though, for the smoothest DC, that would be the way to go.
Jose would need a charger, which are probably also available on eBay. These batteries would keep the phono section going for 7-hours and be half depleted. It would probably be good to keep them all on trickle charge when not playing records.Best regards,
John Elison
Those should work well, John, and four of them wouldn't be that expensive. My only concern would be how well, and how many times they would recover after being "half depleted".That was why I mentioned the deep cycle type battery. They're made to handle being discharged and recharged much better than a normal type battery. Of course I will only have to buy one for my pre-amp, and already have the trickle charger which I use on my motorcycle batteries.
Still, it may be worth a try, Jose!
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