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Show us your vintage headphones! - Page 28

post #406 of 1262
Quote:
Originally Posted by planx View Post

Here's my vintage set! An original AKG K141 Monitor!

 

Those would be the original non-Monitor K 141 (Monitors had non-Sextett drivers and different colors). Looking at the headband, I might make a guess that they may be from earlier stages of production.

 

Would you mind doing a sine sweep on them? There's a review and frequency response graph there: http://wiki.faust3d.com/wiki/index.php?title=Image:AKGk141review79.jpg. The reviewer makes a specific note about the valley between 4 and 7 kHz, and it should be easily heard if it's there. For some reason my vintage K 141 doesn't have it, so I suspect AKG either tweaked the 141 during production or mine has been serviced with Monitor drivers.

 

As a side note, as the reviewer notes about the reversed phase on the 141, has someone actually tried reversing ('correcting') the phase on the K 141 to see if the sound improves? Mine are indeed wired in reverse, but so are a lot of vintage AKG phones - for whatever reason.


Edited by vid - 9/14/12 at 4:42am
post #407 of 1262
Quote:
Originally Posted by takato14 View Post

They are nothing alike. Piezoelectric drivers use a thin diaphragm covered with a high-polymer piezoelectric film. When charge is applied to the diaphragm, it moves. Its a totally magnet-less design. 

 

It requires a HUGE amount of input power. Pioneer recommended driving their piezo cans right out of a receiver's stereo taps. Their impedance is technically infinite and their sensitivity is around 100 dB/30V. Note the SPL units. It's not dB/mW like most. In other words, the sensitivity of this headphone is about 30 dB/mW. Most headphones are around 100 dB/mW. That's really inefficient.

 

So, if they're really, really quiet out of say an iPod or laptop, they're likely piezoelectric.

They're actually slightly easier to drive than my Yamaha HP-3. So now I'm doubtful they're piezoelectric.

post #408 of 1262
Quote:
Originally Posted by vid View Post

 

Those would be the original non-Monitor K 141 (Monitors had non-Sextett drivers and different colors). Looking at the headband, I might make a guess that they may be from earlier stages of production.

 

Would you mind doing a sine sweep on them? There's a review and frequency response graph there: http://wiki.faust3d.com/wiki/index.php?title=Image:AKGk141review79.jpg. The reviewer makes a specific note about the valley between 4 and 7 kHz, and it should be easily heard if it's there. For some reason my vintage K 141 doesn't have it, so I suspect AKG either tweaked the 141 during production or mine has been serviced with Monitor drivers.

 

As a side note, as the reviewer notes about the reversed phase on the 141, has someone actually tried reversing ('correcting') the phase on the K 141 to see if the sound improves? Mine are indeed wired in reverse, but so are a lot of vintage AKG phones - for whatever reason.

 

I thought the Monitors were silver and had 600ohms? While the gold coloured ones were of lower impedance? I'm not too aware of vintage cans. 

 

I don't have the proper equipment to do a sine sweep on them? Nor do I know how to. I could always send it to a lab and they can do it on my behalf, but that's only last destination if I were really inclined on doing so.

post #409 of 1262
Quote:
Originally Posted by planx View Post

 

I thought the Monitors were silver and had 600ohms? While the gold coloured ones were of lower impedance? I'm not too aware of vintage cans. 

 

I don't have the proper equipment to do a sine sweep on them? Nor do I know how to. I could always send it to a lab and they can do it on my behalf, but that's only last destination if I were really inclined on doing so.

Nope -  the gold ones actually say 'Monitor'  beneath the 'K141' in a fancy curvy font. 

The older silver ones don't have monitor written anywhere on it, but it's true they share their drivers with the sextett - my K141 is old and beaten up, but sounds absolutely sublime... love it.

post #410 of 1262
Quote:

Originally Posted by GREQ View Post

 

They're actually slightly easier to drive than my Yamaha HP-3. So now I'm doubtful they're piezoelectric.

Then they're orthos.

 

I want them when and if you're finished with them :3

post #411 of 1262
Quote:

Originally Posted by WhiteCrow View Post

 

Dude, I was reading up on piezoelectric drivers, it's actually like a crystal that reacts with electricity. THESE HEADPHONES ARE POWERED BY ALCHEMY AND VOODOO!

You're mistaken... that's a piezoelectric crystal driver, the SE-300/500/700 use a High-Polymer Piezoelectric film. 

post #412 of 1262
Quote:
Originally Posted by GREQ View Post

Nope -  the gold ones actually say 'Monitor'  beneath the 'K141' in a fancy curvy font. 

The older silver ones don't have monitor written anywhere on it, but it's true they share their drivers with the sextett - my K141 is old and beaten up, but sounds absolutely sublime... love it.

 

So mine must be a Sextett as well? I need to replace new pads, foam disk (my current one is DIY), and elastics. Do you know where to obtain such parts?

post #413 of 1262

subbed for later

post #414 of 1262
Quote:
Originally Posted by planx View Post

I don't have the proper equipment to do a sine sweep on them? Nor do I know how to. I could always send it to a lab and they can do it on my behalf, but that's only last destination if I were really inclined on doing so.

 

You can use SineGen, available here. It's easy to use and quite useful for anyone who's into headphones. Mind the volume.

 

As far as replacing elastics, you can use regular hair bands of suitable thickness. I've heard modern K 141 pads fit the vintage 141, but you'll need to modify the attaching mechanism. Probably not a big deal, but I've not done it myself. I've also heard that aquarium filter foam can be used as a replacement for the foam discs (probably any type of open-cell foam works).

post #415 of 1262
Quote:
Originally Posted by MDR30 View Post

Sennheiser Unipolar 2000 & 20002 small.jpg

 

A pair (!) of Sennheiser Unipolar electrostatics.

 

They've got an interesting driver. Kinda what AKG did with sound ports, only different... The middle part of the driver on the 2000 is covered by transparent plastic (looks totally transparent in the picture, but it's there - a non-breathable plastic film), then a strange donut with an uneven surface, and finally on the outer layer a woven-type covering. Quite strange - and that driver's ruddy massive as well.

post #416 of 1262
Quote:
Originally Posted by vid View Post

Quote:
Originally Posted by MDR30 View Post

Sennheiser Unipolar 2000 & 20002 small.jpg

 

A pair (!) of Sennheiser Unipolar electrostatics.

 

They've got an interesting driver. Kinda what AKG did with sound ports, only different... The middle part of the driver on the 2000 is covered by transparent plastic (looks totally transparent in the picture, but it's there - a non-breathable plastic film), then a strange donut with an uneven surface, and finally on the outer layer a woven-type covering. Quite strange - and that driver's ruddy massive as well.

Wow, TWO of them? You're one lucky fella.

 

EDIT: Stupid nested quotes >_<

 

Interesting.... I've never seen the Senn. stats myself.


Edited by takato14 - 9/14/12 at 5:26pm
post #417 of 1262
Quote:
Originally Posted by planx View Post I need to replace new pads, foam disk (my current one is DIY), and elastics. Do you know where to obtain such parts?

the foam disk is sort of a trial and error thing, unless the new aftermarket 141 pads have them. Trouble is the new 141 pads attach differently, I think Thomann.de had some for the older ones.

 

Elastics are easy to find. Go to any decent fabric store you can find black elastics on large rolls, a couple sizes even it sure looks like the thinnner stock stuff. Dirt cheap and available in huge lengths. I may swap out my hairbands soon which don't feel as sturdy as this elastic.

 

Pm me if you want me to send you some elastics, I'm just across the water here on the island:)

post #418 of 1262
Quote:
Originally Posted by nick n View Post

the foam disk is sort of a trial and error thing, unless the new aftermarket 141 pads have them. Trouble is the new 141 pads attach differently, I think Thomann.de had some for the older ones.

 

Elastics are easy to find. Go to any decent fabric store you can find black elastics on large rolls, a couple sizes even it sure looks like the thinnner stock stuff. Dirt cheap and available in huge lengths. I may swap out my hairbands soon which don't feel as sturdy as this elastic.

 

Pm me if you want me to send you some elastics, I'm just across the water here on the island:)

 

The foam disk isn't a priority because I think my DIY is good enough. I cut the correct size from the pads the V-Jays.

 

Instead, why don't you come to my meet this Sunday? Info is in my sig

post #419 of 1262

Yeah I saw that  but unfortunately can't make it, though i would really like to attend one of the next ones.  It's been on my mind for a while hitting up a meet.

post #420 of 1262
Quote:
Originally Posted by nick n View Post

Yeah I saw that  but unfortunately can't make it, though i would really like to attend one of the next ones.  It's been on my mind for a while hitting up a meet.

 

That's unfortunate, maybe next time!

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