[Negative818]

  It's been a while since I've gone back to look at a photo again multiple times.
I'd love to get all of those in my light-tent for a photo shoot ^_^

i.e. mail them to me so I can take "pics" of them, but really I just want to listen to all of them.

 

[GREQ]

 

  It's been a while since I've gone back to look at a photo again multiple times.
I'd love to get all of those in my light-tent for a photo shoot ^_^

i.e. mail them to me so I can take "pics" of them, but really I just want to listen to all of them.

What's that? A vintage headphone tour you say?

 

[tascamtascam]

  Yes! Awesome, that's beautiful. The page you linked says the switch is an impedance adjustment? "8 Ω / 300 Ω / 1,000 Ω switching"

 
Does this Philips N6325 (1000 Ohm at 500Hz) share some similar driving principle / technology?
 

 
 

 

[WallofHooligans]

   
Does this Philips N6325 (1000 Ohm at 500Hz) share some similar driving principle / technology?
 
 

I think so. I'd imagine it's the same tech in the AKG k340, cept it's located in the cups instead of the cable.

 

[ruhenheiM]

   
Does this Philips N6325 (1000 Ohm at 500Hz) share some similar driving principle / technology?
 

not sure if it's back electret or not

 

[jon parker]

I have a pair of these coming . . .  Wondering  if anyone knows what they are? 
Hopefully a good gamble
 
A far as I can make out J.I.S means Japanese Industry Standard - but whether that means they are any good...we will see
They have 2x mono cable, 1 for each cup...which is odd
 

 

 

[nick n]

  not sure if it's back electret or not

Regular large diaphragm electrets.
Odd brass non vented inner rear housing/frame with small felt bumpers on the earside stator to stop the driver from burning out/holes when hitting due to excursion.
Pretty sure they are one sided, as in stators are on the earside and only one per driver.
OPPO HA-2 portable amp was the best I have heard them with ( I mean the 6325= the same thing ).
Rather hard to drive and synergy even harder to find with amps.
Small size of transformers limits their potential I think.
Ignore my stupid comments, i"m sure theres a few.
http://www.head-fi.org/t/111193/orthodynamic-roundup/20400#post_8662131
***6325 with the transformers inline on the cable might be best for grafting a cable onto  ( removing or bypassing incline transformers ) and using the Stax transformer units instead. Had good success bypassing in ears sized transformers on some electrets before and driving with a Stax electret recable ( or 4 pin DIN plug for other compatible boxes from Audio Technica etc ).
 Makes a difference.
***** you CANNOT get into these housings, so all work would have to be done from outside if messing with recabling.
 
 

  I have a pair of these coming . . .  Wondering  if anyone knows what they are? 
Hopefully a good gamble
 
A far as I can make out J.I.S means Japanese Industry Standard - but whether that means they are any good...we will see
They have 2x mono cable, 1 for each cup...which is odd
 

 
Ah you got those. Seems like a Sawfuji variant ( SF-17 variant ) used for telecom or sound board use(?)
So I am guessing 99.999999% SFI drivers, so yes orthodynamic.
 
Looks like you can cut the ends off and jam the cable into a larger entry new stereo TRS jack, since the cable appears to only be split near the bottom.
Nice work.
= I'd be curious what their impedance is on each driver: 8, 32, 63/64 or 120 ohm ( if forget if there was ever a 16 ohm ).
= also curious if they are indeed open or simply a closed solid back that looks like mesh, maybe it looks solid, can't tell from the picture.
 
either way should sound good.

 

[GREQ]

 

 
 
either way should sound good.

Yes, this was one of the better sounding SFI variants IIRC. 
Glad to see someone around these parts picked it up. Good stuff.

 

[WallofHooligans]

I really miss the gallery view of all the images submitted to the thread. It's such a pain to find all of the pictures posted here. Dark times.

 

[GREQ]

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[GREQ]

.

 

[jon parker]

Sometimes . . . Magic happens! - 1970's Beyerdynamic DT 220
The first 'modern' sounding vintage 1970's headphone I have had the pleasure of finding

(Ive been on a vintage headphone journey of late...)

> I found a pair of Beyerdynamic DT 220's for £23 - Even managed to find some new original pads which considering they are from the 70's was lucky... although they were almost as expensive as the headphone !

At first they had somewhat of the typical 1970's headphone sound, not a huge bass, smooth highs and forward energetic mids. They sounded a little 'plastic' or 'metallic' but there was however something different about them.
I have found that often these old headphones haven't been used for a while and it takes a while to 'warm up' the drivers again.

Inside, the cups had a simple small driver held in the plastic cup - no padding, very basic. They have an interesting piece of rubber that surrounds the driver and [as someone else commented] may be designed to touch the ear to give some physical visceral low end energy?
Anyway, I had a hunch and tried my first mod - rolled up cotton wool & cloth over the driver.

After a while flexing the driver again with music following on from the mod - Im left somewhat stunned at what these 40 year old headphones have to offer !

The sound, on the one hand, is in general neutral in nature with some of the most natural male and female vocals I have heard. Yet at the same time they have an amazing Grado like PraT that is bright, clean yet creamy smooth within the brightness.
They handle all genres really well with acoustic, jazz and classical being particularly impressive
Its a sound signature I haven't heard in any other headphone so it is a little difficult to explain

But, what is truly exceptional about them is how they separate each instrument - It's not that they have a huge soundstage but the way each instrument has its own space is amazing. They seem to choose certain parts of the mix and have great skill in putting them in their own space and yet the sound remains quite energetic and engaging.
They have a 3D around the head imaging that makes a real joy to listen to the audio never mind the music!

I believe they are 400 oHm - They certainly come alive with a portable headphone amp.
The only downside is the weird shape of the headphone [band?] It seems the top of the cups is tighter than the bottom side of the cups so a perfect seal is not easy, although with a bit of adjusting its fine.
As a final mod I part glued on some velour pads i had spare.
For such an old pair of headphones I am finding these being used for my daily listen - surprising in that I have many fine headphones - perhaps more surprising for a 1970's headphone

The end result :

 

[GREQ]

.

 

[MrTechAgent]

Oh boy, that is absolute porn.
My wallet is ready in case you get bored of them!

 

[GREQ]

Oh boy, that is absolute porn.
My wallet is ready in case you get bored of them!

It feels like I'm turning into your dealer... it's not my responsibility but man, you've got an addiction ^_^