WAD Phono2 power supply.

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shane
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#1 WAD Phono2 power supply.

Post by shane »

I recently got hold of a fully built WAD Phono2 PCB, which I'm intending to build into a suitable enclosure to replace the nondescript phono stage I'm using a the moment. I also got a PRE2 board with the CF conversion, but have yet to decide whether to use this or not.

Should I just build a PSU2 clone to power it, or is there a better alternative?
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#2 Re: WAD Phono2 power supply.

Post by IslandPink »

Choices are :
Shunt-Reg
Shunt-Reg
Shunt-Reg :!:
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#3 Re: WAD Phono2 power supply.

Post by shane »

You sure about that? 😀
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#4 Re: WAD Phono2 power supply.

Post by IslandPink »

Not kidding, I think Nick and JamesD would agree .. ?
For example ( wheels out phono circuit again again ) :
http://www.audio-talk.co.uk/phpBB3/view ... 9&start=15

As less current required for phono2 maybe OA2 and OB2 ( is it ? ) for the shunt , for 255V .
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#5 Re: WAD Phono2 power supply.

Post by shane »

Thanks Mark, I shall re-visit that thread tomorrow. I've looked through it before when I was considering building a C3G based phono but chickened out, made a lot of sense then, iirc.
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#6 Re: WAD Phono2 power supply.

Post by Nick »

Yep, the WAD phono works a treat with a couple of VR tubes driven via a CCS.
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#7 Re: WAD Phono2 power supply.

Post by pre65 »

Nick (G),

I have somewhere (on an old hard drive I think) a circuit of yours using VR tubes, is this still in the public domain ?

If so I'll share it with Shane.
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#8 Re: WAD Phono2 power supply.

Post by Nick »

Help yourself.
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#9 Re: WAD Phono2 power supply.

Post by Mike H »

Nick wrote: Tue Feb 28, 2017 8:24 am Yep, the WAD phono works a treat with a couple of VR tubes driven via a CCS.

Image


.
 
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#10 Re: WAD Phono2 power supply.

Post by shane »

Liking the sound of this!
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#11 Re: WAD Phono2 power supply.

Post by Nick »

All the way from 2003

Image
Image
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#12 Re: WAD Phono2 power supply.

Post by pre65 »

That is the circuit I was remembering. :)

Shane, I have a spare Hammond choke as used to "improve" the PSU3 if you are interested. Unused and unopened box.

Hammond 157G 30H 40ma max DCR 595 ohm and 400v max.

PM me if interested.
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#13 Re: WAD Phono2 power supply.

Post by shane »

Thanks chaps, that looks do-able, even for someone of my limited experience, but prepare for many silly questions!

The first to come to mind is the function of the 240v-9v followed by 9v-240v txs. I have a mains tx with 2x260v and 2x6.3v windings. Could I use that instead? If not, not a problem. It should fetch enough on eBay to fund a couple of 240v-9v jobbies.

Finance is limited, but time and curiosity are not.

Phil, I'll PM you re the choke.
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#14 Re: WAD Phono2 power supply.

Post by pre65 »

You need 9v for the regulated 6.3v.
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#15 Re: WAD Phono2 power supply.

Post by shane »

True, but my question was more about why the two transformers, rather than a single one with 240v and 9v secondaries. With my tx, I could connect the two 6.3v windings in series to give 12.6, if that didn't overwhelm the regulator.
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