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John Buchanan

Time for some Stax SR-Sigma love......

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The mod was done by a Thai head-fi member in Thailand. He took out the 507 drivers from their plastic enclosures and wrap them with some kinds of Carbon-Keflar tape. He used hot air from a hot air gun to soften the tape then wrapped the tape aroumd the drivers. Once cool, the tape became stiff and held the drivers in place pretty well.

Wachara C.

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...at least the shipping is free... laugh.png

Something John will appreciate, I now have a matching SRM-Monitor setup here with a ED-1 and SRM-1 Mk2 PP, both in lovely black with gold lettering. :)

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Haven't tried it yet as I still have to refurb the ED-1. Bloody low voltage circuits so nothing's in stock for them... laugh.png

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I find that both the Sigma Pro and Sigma/404 are surprisingly good out of the old Stax SRM1 Mk2 amps, even compared to the more powerful and recent the Stax 717. In fact I may even have a preference for that pairing vs with the 717. On the other hand my 007a phones do not sound as good on the SRM amps. I find this odd because I find the Sigmas less efficient than the 007a and you would think the bigger amp would be a help. Possibly some kind of synergy is at work here in which Stax voiced its amps to match its then current product. The SRM amps and the Sigmas are both from the 80's. The Stax History line shows the Sigma pro coming out in 1987, whereas the first SRM pro amp was 1982.

I still find the Sigma pro and Sigma/404 are by far the best way to listen to opera and choral music. I can't quite put my finger on why this is. Possibly the increased spaciousness of sound with this design, compared to conventional phones, works to recreate the sense of openess and the opera house acoustic.

Edited by edstrelow

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I sometimes use my 007 Mk1's with this amp and feel it does produce very good sound, even the bottom end is quite good too. Not up to BHSE or T2 standards but its no slouch, especially in view of their cost compared to more recent models

On the other hand my 007a phones do not sound as good on the SRM amps. I find this odd because I find the Sigmas less efficient than the 007a and you would think the bigger amp would be a help.

Which Stax do you plan to run these with Birgir when they are refurbed?

Haven't tried it yet as I still have to refurb the ED-1. Bloody low voltage circuits so nothing's in stock for them... laugh.png

Edited by complin

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This ED-1 is tuned for the L-Pro but none of those around so SR-202's should be close enough and my pile of other Lambdas.

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This ED-1 is tuned for the L-Pro but none of those around so SR-202's should be close enough and my pile of other Lambdas.

So what do you think of the sound of the Stax ED-1/202 combo, Birgir?

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The SRA-12S is a nice amp (I have two here) but it really needs to be refusbished at this point. It runs very hot and the caps don't age all that well...

So what do you think of the sound of the Stax ED-1/202 combo, Birgir?

Haven't tried it yet, KGSSHV and HE90-Signature takes up all listening time. :)

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Birgir, would the caps be it or do other components need to be replaced? I ask because I could take care of replacing the caps, thanks.

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I was just handed a SR-Lambda Pro to refurbish so I guess I can try the diffuse field EQ after all... :)

Birgir, would the caps be it or do other components need to be replaced? I ask because I could take care of replacing the caps, thanks.

Yup, all the electrolytic caps need to be replaced. Most are axial bot the BC caps are excellent.

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I've been spending the week with the SR-Lambda Pro and the ED-1/SRM-1 Mk 2 combo and while the effect works for some material the downsides are just too great for me. The strong center image is achieved by severely limiting the top end and the bass has a notch to it. With modern tech this effect could be accomplished without the bad effects but it's still a neat piece of Stax madness. :)

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