Battery power supply for phono stage

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vinylnvalves
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#1 Battery power supply for phono stage

Post by vinylnvalves »

I recently bought as a stop gap a proj-ect RS phono stage, as my valve one is misbehaving. OMG what a revelation it's no longer a stop gap, the valve ones relegated. I have read that this phono stage - really benefits from replacing its Walmart psu. Project will sell you a battery powered one, but at £400, I thought I will make one. It needs a +/- 18v supply, I estimate needing 500ma ( from the battery life stats) it's dual mono, and looks to have further regulation inside the amp ( as one would expect)

This is where the forums experience comes in, what type of batteries do I go for, i think I remember reading somewhere that lead acid ones are the lowest noise type. I think this nugget of information was from before lithium polymer ones came out, so may no longer be correct.
Lead acid ones are easy - I just get alarm backup batteries, in series. However I was thinking about using power tool ones, a pair of 18v 4.5ah drill lipo batteries can be found on line for around £50, and would give around 9 hrs of listening between chargers.
Anyone done anything similar and has some wise words.
simon
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#2 Re: Battery power supply for phono stage

Post by simon »

Sorry, no wise words. Not sure if anyone here's really tried it? I think Cressy Snr might have but for filaments of 3A5/DCC90s (or some such).

Someone called Chopsaw I think brought his impressive perspex TT he'd made to an Eggy meet a few years ago and I think he used batteries to power his phono stage. Apart from that I can't think of anyone. I might still be considering a decent regulated supply rather than batteries though, just for the convenience. Hopefully someone will chime in with something more useful.
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andrew Ivimey
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#3 Re: Battery power supply for phono stage

Post by andrew Ivimey »

For filaments (26) I used lead acid rechargeables. Sorted.
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pre65
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#4 Re: Battery power supply for phono stage

Post by pre65 »

andrew Ivimey wrote: Fri Mar 24, 2017 11:39 pm For filaments (26) I used lead acid rechargeables. Sorted.
Andrew, did you try those Rod Coleman filament supplies that you got from me on the 26 ?
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pre65
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#5 Re: Battery power supply for phono stage

Post by pre65 »

For an inexpensive dual rail option what about this ?

http://www.ebay.co.uk/itm/AC-DC-LF353-S ... Sw74FXPXeZ
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Ray P
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#6 Re: Battery power supply for phono stage

Post by Ray P »

As an alternative to a battery supply perhaps consider a good low-noise shunt supply;

http://www.diyaudio.com/forums/group-bu ... t-reg.html

http://twistedpearaudio.com/power/placidbp.aspx
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vinylnvalves
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#7 Re: Battery power supply for phono stage

Post by vinylnvalves »

I saw this battery phono psu's, very similar to what I was thinking.
http://www.bartola.co.uk/valves/tag/lea ... o-preamps/
I had been thinking of lipo's until someone at work told me of a friend of his in a model RC aircraft club who had burnt his house down, charging lithium polymers.

As some of you have pointed out a well designed linear power supply also is an option. I need to look what voltage regulation is in the amp, as no point in going OTT if there's a regulator IC's adding noise later in the chain. The batteries will have a lower resistance, than a regulated psu's if that's important for small signals is another matter.
vinylnvalves
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#8 Re: Battery power supply for phono stage

Post by vinylnvalves »

Has anyone used these low noise regulators, are they worth the extra?
http://www.ebay.co.uk/itm/252380565873? ... EBIDX%3AIT
I am warming to the idea of a good linear power supply, over batteries. Ideally I would prefer to buy populated boards and these seemed to be a good balance. I had also seen these but cannot find any details on the circuit. http://www.ebay.co.uk/itm/Assembled-S11 ... 1828014441
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#9 Re: Battery power supply for phono stage

Post by Andrew »

At the risk of recommending an AT solution and sounding like a salesman, I'm nothing of the sort, by the way as I'm poor salesman at best. Have you considered Nick's regulated supplies?

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andrew Ivimey
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#10 Re: Battery power supply for phono stage

Post by andrew Ivimey »

&How would anyone know about Nick's regulators?
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vinylnvalves
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#11 Re: Battery power supply for phono stage

Post by vinylnvalves »

If I knew what nicks regulators were, I may consider them :D
I worked out that second regulator I referenced off eBay is a clone of a sigma 22 Psu from AMB audio.http://www.amb.org/audio/sigma22/. I found a thread on diy audio suggesting that the TPS7A4700 based ones are better. So unless anyone has anything against them, or I find out about Nicks I will go with the TPS7A4700 ones
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Greg
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#12 Re: Battery power supply for phono stage

Post by Greg »

Before you do that, how about PM'ing Nick to find out a bit more?
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Nick
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#13 Re: Battery power supply for phono stage

Post by Nick »

I have a dual regulator board that I normally use for m-dac supplies (+18v, 0, -18v). May work well for your phono stage. Happy to make one up if you want to try it.
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