12vac power supply for Valve Eccamatics.....

Moderators: George Geddes, David Martin, dave robinson, Iain Purdon, ecca

Re: 12vac power supply for Valve Eccamatics.....

Postby Nick Allan » Fri Jun 28, 2013 10:08 am

Thanks Keith.

All the best,

Nick
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Re: 12vac power supply for Valve Eccamatics.....

Postby Detailed Infinity » Thu Mar 13, 2014 10:53 am

No joy in finding a 12Vac PSU at RS. Out of stock and not due in until end of July !!! http://uk.rs-online.com/web/p/plug-in-power-supply/7300237/. Anyone any suggestions as the Echo is sat there doing nothing until I can find a PSU.

Bri
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Re: 12vac power supply for Valve Eccamatics.....

Postby RogerCook » Thu Mar 13, 2014 1:46 pm

I just Googled 12v ac-ac and this came up

http://www.juno.co.uk/products/mercury- ... tAod0WoAcw
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Re: 12vac power supply for Valve Eccamatics.....

Postby AlanMcKillop » Thu Mar 13, 2014 3:10 pm

I may have missed something, but I'm sure I got mine from Maplins for about £12 - 15.
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Re: 12vac power supply for Valve Eccamatics.....

Postby Alan Prudhoe » Thu Mar 13, 2014 3:56 pm

Wasn't the old RFX2000 Power Adapter 12v 500 ma?

Soneone may have one lying around doing nowt.
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Re: 12vac power supply for Valve Eccamatics.....

Postby ecca » Thu Mar 13, 2014 4:29 pm

Maplins N58AT
Yes, the Magicstomp is OK.
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Re: 12vac power supply for Valve Eccamatics.....

Postby GuitarPhil » Thu Mar 13, 2014 5:10 pm

RogerCook wrote:I just Googled 12v ac-ac and this came up

http://www.juno.co.uk/products/mercury- ... tAod0WoAcw


Roger, that one supplies only 500mA and IIRC Ecca recommended a 1.6A supply. It has to drive the valve heaters so it may take a fair amount of current. Ecca will be able to confirm if this one will suffice - it's certainly a lot cheaper than the out of stock RS jobbie!
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Re: 12vac power supply for Valve Eccamatics.....

Postby Detailed Infinity » Thu Mar 13, 2014 5:46 pm

Yes Eric specifies >1amp and as you say driving the YuangJing 6N3 board's pre-amp valves heaters in the unit would need surplus current re amperage so that heat doesn't become a problem with the supply.

I'm thinking of putting in a transformer with 12v AC output with sufficient amperage and inputing to a male 3 pin C16 in the chassis case which I've got lying around. Mains straight in then. There's plenty of room in the enclosure to accommodate one. Would that be a problem Eric?

Bri
Last edited by Detailed Infinity on Fri Mar 14, 2014 12:46 pm, edited 1 time in total.
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Re: 12vac power supply for Valve Eccamatics.....

Postby ecca » Thu Mar 13, 2014 6:33 pm

500ma is no good.
Be careful where you position a transformer, keep it away from the pre-amp input.
Be also careful as to transformer quality, hums can come from nowhere, toroidal is best.

Infinitely simpler, and safer to keep it all outside.

In viewing the power supplies at Maplins it seems the prices have gone crazy.
Lord knows why.

Here's another.... http://www.ebay.co.uk/itm/AC-AC-MAINS-POWER-ADAPTOR-SUPPLY-CHARGER-PSU-1A-1AMP-1000MA-12V-12-VOLT-2-1MM-/121288054559?pt=UK_ConsumerElectronics_PowerAdaptors_SM&hash=item1c3d54d71f

and another....... http://www.ebay.co.uk/itm/AC-AC-POWER-SUPPLY-ADAPTOR-12V-13-5V-15V-18V-1AMP-/200951292676?pt=UK_Sound_Vision_Other&hash=item2ec9a16304
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Re: 12vac power supply for Valve Eccamatics.....

Postby Detailed Infinity » Thu Mar 13, 2014 11:18 pm

Thanks Eric for the links. Of course you're right in saying transformer noise/interferance could be a problem to circuitry and keeping a supply outboard is the better option. I was getting brassed off trying to find a PSU 12v AC >1000ma. As Jock said Maplins do one but Donny was a no go and the price !!!!

Anyhow it's now sorted thanks to ebay.

Bri
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