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Everything posted by spritzer
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Looks great. I make all my cables like this now and the flexibility is great. How people can live with the VD stuff is lost on me...
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The flash was probably from the fuse but the smoke is harder to pin down. Since you basically short circuited the transformer it could come from a number of components. If it works it works so no worries and listen to some tunes...
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The Stax ribbon cable is the following for the 3 wires entering each housing: Wire with stripe or dotted line is the +, the middle wire is the bias and the last wire is the -. If you look carefully at the plastic housing of the Gamma drivers you can see the markings for + and -.
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The caps are the problem as 550v parts are rare and 600v+ electrolytic's are all but unheard of in the sizes needed. There is always the option of having them custom made but the cost...
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I had heard that there was something cooking. Sign me up for a PCB or two but we need at least +/-450v...
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I don't have any but who wants to settle for that supply when the BH deserves so much better. For comparison I'm going with a Sigma22 as the +/-15v psu so overkill is the name of the day...
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Want some BH PCB's...??
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Damn right!!!
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Blah Nordost is just some silver plater copper crap in teflon. If you want really great tea I recommend the Acrolink 7n PC-OCC cables.
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It does say OTL in the text but they could be using a push-pull choke to act as a primary on an output transformer similar to what Jones did in his 845 DD ESL amp. I quite like the output transformer box you can use with the amp...
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Nothing really. Bog standard kettle cable.
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It's for its own good.
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The old mini-disc players were much better then the Apple junk and some even very good. Mini-disc was so very cool in 1995... 100gb disc and Rockbox. I might go to town on the output and fit a high pass filter off the dac or dsp chips bypassing all the active crap.
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Ghetto and dangerous... I like it!! Molex pins (PSU connectors in computers) work great as ghetto Stax pins and sockets so they can be used with plenty of electrical tape.
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It's good to hear that it's working. We did know that the current requirements would kill anything but the BH but it does work. So does anybody at Canjam have a 4 pin XLR socket, a Stax male plug and some 1000v teflon wire?
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Thanks for that. There appear to have been 3 different drivers, color coded. My ECR-400 had red drivers but what's in the ECR-500?
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So there is foam damping in your set? The ECR400 I had (in parts now due to channel imbalance) had mineral wool as damping though it wasn't as thick as the stuff Stax used. The SR-5 pads are nearly identical but I suppose SR-007 pads would fit as well... You polygamist you... The amount of damping has a huge impact on the SPL level as you are wasting away energy to tame tame the drivers. I'm getting a modified Toshiba Gigabeat soon that shouldn't have any problem driving the phones That's what I did. Call up the US distributor and ask about a replacement 202 cable. You can also buy a whole lot of Koss extension cables but they are a bitch to work with. Woodies would be nice as the drivers are quite good. If I find a better headphone then the UR18 I might just mod that as well for kicks. I can always buy more drivers...
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I have a ECR-400 and the drivers are true works of art. An SR-X type of chassis might prove to be very good indeed.
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Great little drivers but this particular version will never be used with an ipod. I just borrowed my brothers 80gig unit and it hasn't got the power to push them to anything more then background listening. I have to admit that I'm nowhere as crazy as you though with your quadro setup
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I figured this topic deserved a new thread and I'll kick it off with impressions of my new Koss UR18 foster phone. Those that have been following the ortho thread on HF know about the SFI drivers that cost next to nothing yet deliver in spades. I found a Koss UR18 cheap brand new today and it had all the right characteristics of a good foster phone, pleather pads, dual entry (I just like it like that) and thin earpads and a small enclosure. By sheer luck they had drivers which were exactly the same diameter as the SFI units so conversion was easy. Remove the old drivers and insert the new ones. Here you can see one earpiece and how I damped the housing. I didn't use the loo paper in the end and used some fiber paper instead. As you can see I left a few of the ports on the back open but heavily damped. The old drivers are there for comparison. The drivers have been glued in place with some old epoxy I had and more damping added to the baffle. I didn't really experiment with this but now that I have them playing the chassis could do with some more damping as it resonates quite a bit. They are now ready for assembly. I used 3 sheets of fiber paper over next to the driver, then came the stock foam damping and last came one sheet of fiber paper next to the earcup to damp the ports. Two really similar headphones so now we know where Stax stole the design. Also note the different size of the earpads. I just stuffed some rubber tubing I use to make cables under the pads and twisted them so the middle part is double the thickness of the ends. The Lambda pads were a great idea so why not borrow it... It really helps the imaging by controlling the angle of the drivers. As to the sound then they have no right to sound this good since the stock headphones are horrible. The bass is tight and controlled, plenty of treble though never bright and the midrange has great presence. The soundstage is what you would expect from a supra aural though slightly diffused. They haven't even been trough a 700 hour burn in yet they sound great. There are some nasty resonances due to the chassis and therefore low level detail isn't up to ESP level but who cares as these cost less then 50$ new. They are also foldable and come with a 3.5mm jack so portable orthos!!!
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Way ahead of you... I'm now moving upscale with some Tork's fiber paper to see if I can get some more bass. I've also angled the earpads to good effect as the POS Koss frame if too weak for a firm seal. The epoxy is still not ready so they just sit here playing in the mean time. It's a nightmare all right. I spent one evening trying to beat 3 SRM-T1's into submission... ohh the horror!!! That can certainly be an issue and will make it much harder to bias properly.
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Congrats!! There is no need for a matched quad of tubes but matched pairs will make your life much easier as biasing Stax amps is a bitch!!! I need to get me a Trends UD-10 for the computer one of these days... Btw. I just finished converting a Koss UR18 by swapping the driver for the SFI ones. It's a great foster phone since it's cheap, the drivers are the exact same diameter as the SFI units and it's foldable. It needs more damping but the sound isn't half bad...
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Cool, please keep us informed how it works out for you.
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Koss UR18,time for some high end headphone listening! ...or using them as a foster phone for some SFI drivers.
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By making the arc taller it should decrease the weight carried by the headband and transfer it to the earpads instead.