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1000+ Head-Fier
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Here's a possible solution for the SRM-252 power supply. This isn't really a recommendation as I haven't tried this one myself, just a suggestion. It could potentially be a piece of junk.
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_162996_-1
12VDC at 500mA with a 7812 linear regulator and a 2.1mm x 5.5mm connector.
A polarity reversing adapter would be needed for center negative, otherwise the cable would have to be cut and the wires reversed. This one looks correct but I'm not certain. You'd probably want to check it first with a multimeter to be sure.
http://www.elliottelectronicsupply.com/2-1mm-jack-2-1mm-plug-reverse-polarity-dc-power-supply-adaptor.html
There's a 1A version of the power supply as well, but it uses a non-standard regulator IC that I've never heard of.
The proper wall-wart that Stax provides with the North American SRM-252 is model no. 1240, 117V 60hz input, 12VDC at 400mA output, unregulated.
Ultimately, it would be easier to buy a 120V to 100V step-down transformer from Amazon and use the Japanese wall-wart you already have.
Does anyone know if the design below would also turn a SRD-6/7 into a Pro adaptor?
http://www.headfonia.com/stax-srm-1mk2-bias-modification/#comment-960617449
Hi
I have also a SRM-717, 100V japanese version. (use now transformer to adapt to 220V, 50Hz)
Now how to solder to get the 100V to 220V?
Can you give me the details how you did it?
Peter
Don't sell the 007 until you've done a long comparo between the 007 & 009.
Then sell the one you like least, or better still, keep both.
No, that would never work. No HV AC voltage to draw from so you need at least 6 stages in the multiplier.
I made a PCB that does just this a few years ago and I always keep them "in stock" in case somebody needs one.
Don't sell the 007 until you've done a long comparo between the 007 & 009.
Then sell the one you like least, or better still, keep both.
+1 Definitely keep both
Try the 407 and 507 you will love it. I never liked buying used headphones.
Personally, after listning to both 407 and 507, I went with the 407. I felt there was a better overall balance. Everyone has their tastes and everyone's ears are a bit different, too. I heard more solidity in the bass in the 407's, and a bit less sharpness in the 507's. Plenty of detail with both. I don't think you would go wrong with either, but by all means, listen to both if at all possible. (It doesn't hurt that the 407's will deflate your wallet a tad less!)
Seems like the highest end model of the Lambdas is often overlooked - I remember reading a review about a comparison between the SR-303 and SR-404 by 6moons, and not even they, of all people, claimed an audible difference between the two.
If you could get a 303 and 404 at the same price, you would go for the 404 but if it's any cheaper the 303 is a good buy, but the colour is damn uglier looking then the brown.
Psssssssh. I own an SR-303. Anybody who buys a Stax Lambda is probably not concerned about looks in the first place.
If they use identical transducers, then why did Stax make an SR-404? Did they think nobody would figure it out or something? Why would anyone pay a ton more money for the same ugly headphone with a slightly different color scheme?
Quality control, set up time, cable material, better tested drivers and better tested don't know what.. comes to mind. Like Grado selling the same driver, but the best driver goes in the higher end models.