Thanks guys, I so love the detective work
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Originally Posted by iQEM /img/forum/go_quote.gif
now how about you,Sim1 and wualta (and tyre too?) sit together make a deep comparison about each T50 that available. And please complete the result here with side by side picts..
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Hah, that would be great, except we live in different parts of the world
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Originally Posted by Sim1 /img/forum/go_quote.gif
Now the weirdest thing I noticed right before the moment. I measured the impedance it is higher than normal - 83 and 91 Ohms... so the drivers meant to be probably some 90 or 85 Ohms! Actually when you look at their diaphragm the coil is rather longer (it is more of it on the same surface).
The so called v2 I own are a real mistery.
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Yes I noted this too. The higher impedance is surely because it has longer traces covering more of the diaphragm.
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Originally Posted by wualta /img/forum/go_quote.gif
Kabeer, did you manage to get an image of a 1975 brochure showing a photo of a Fostex-branded T50 from the J-Wiki guy(s)?
I don't know precisely what you mean by "final treble extention", but the T50v1 I have does not lack for treble extension.
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Nope, I did not, but I was impatient to wait for it
. From what he tells me though in his Japanese magazine the T50 was available in 1975. I have no reason to distrust that.
But of course it would be so much cooler for us to see it personally.
As for the treble extention I dont have a kHz figure just a general feeling from listening to a few songs. Cymbals for instance are still there well enough.
In fact I spoke to Don, (and read the descriptions from others who had posted hearing them), luvdunhill's pair was said to lack some upper treble too.
As to why your T50 doesnt lack the final extension, I have a few working theories.
1) You have a different production 'v1', because from the cable differences I showed you it is possible there were more than a few design changes...(but from my experience of the Japanese one I would now say this is the less likely possibility for the sound difference).
2) All of our hearing differences (again i'll place this a lower probability).
3) This is the one im gonna go with: Earpads!
First of all, the T50v0 has the flat thick pleather NAD style pads. I have not felt T50v1 pads, but from what I am aware, they are a bit different right?
To the differences between your pair, and luvdunhill's, my educated guess would be that your earpads are more worn out than his.
Its the YH-1000 worn pad effect.
Do you remember my Aiwa earpads? im going to hazard a guess that your T50v1 pads are inbetween NAD and my Aiwa pads (ie you have thin pleather that has started to crack), because the cracks in the thin pleather make the pad slightly leaky, and this elevates treble response in the mix.
When I put the Aiwa pads on my T50v0 the treble response ups, I feel no want for treble at all.
If possible could you take a macro of your v1 pads, with & without flash to bring out any cracks?
It would be good i luvdunhill could do the same too. His pair has been played around with so maybe they might have started wearing too now.
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Originally Posted by mypasswordis /img/forum/go_quote.gif
So do tell, what does it sound like with O2 pads?
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The O2 pads allows the full baffle aperture to ring out. As well as placing the driver further away which in turn makes the headstaging seem bigger. It opens up the treble quite a bit, actually a hint too much for me and my tastes.
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Originally Posted by wualta /img/forum/go_quote.gif
The sketch in the brochure does seem to imply the sharp-cornered style of voice coil, but as ericj showed us, there was at least one SS-100 driver with a voice coil pattern virtually identical to the T50's. Those photos are of drivers bought as NOS spare parts, so it's possible there was an earlier design with sharp corners, but there's plenty of precedent for not trusting all the details in brochures, too.
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How did I miss this! Sim1 or another SS-100 owner, have you ever peeked into the magnets of your driver? From my experience of looking into the magnet slits of a T30, you should be able to immediately tell if it has a T30 or T50 style serpentine pattern inside.
Wualta/eric: This SS-100 spare driver, how confirmed is it, that is actually a SS100 spare driver?
I see it as follows:
1) SS-100 had two different drivers like the T50 did
2) That driver is not an SS-100 one, but rather a driver for one of the Japanese large driver orthos.
Troopers, can you take a macro photo to see between the magnet slits of your spare parts SS100 drivers which were described as '77mm', which coincidently are how some of the Japanese large driver orthos were described.
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