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post #1486 of 1493

Fostex seems version 2. Version 1 was with split headband.

post #1487 of 1493
Quote:
Originally Posted by yaluen View Post

Hi fellow vintage HP nuts, I recently sent a few phones off to Tyll to be measured. Here are some photos of the DUTs:
















What you see are the Fostex T50, Aurex/Toshiba HR-V9 back electret, and Yamaha YH-5M. Also measured was a pair of HD414's, plenty of photos for that one on the interwebs.

The HR-V9 is a favourite, very even and extended response, fast transients, but its background is not as black as I'd like, perhaps because of the construction of its housing. I shall post some photos of its innards later on.

I've also scanned a copy of a YH-5M brochure I have which I've uploaded here: https://dl.dropboxusercontent.com/u/49755/yh-5m_brochure.zip.

Hope you enjoyed!
YAY! Been wanting to see Fostex T50 measurements for the longest time now.
post #1488 of 1493

I would like to see if Fostex T50v2 compares to all other variants NAD RP-18 and if v1 is significantly better.

post #1489 of 1493

A bit more on the HR-V9, here is what I assume are its original specs, courtesy of Kohara-san and his Headphone Modern Museum site (http://20cheaddatebase.web.fc2.com/aurex/HR-V9.html):

 

 

■ Price: ¥12,000
■ Type: Complementary Back Electret Condenser
■ Diaphragm: 51mm 4micron polyester film
■ Impedance: 4,000Ω
■ Frequency Response: 20-20,000Hz
■ Sensitivity: 107dB/3V
■ Cable: 3m
■ Weight: 230g
■ Released: October 1980
■ Discontinued: 1984~85
■ NB: Distortion <0.5%

 

And also a diagram of Aurex's complementary back electret configuration, showing the charged film on the stators (http://20cheaddatebase.web.fc2.com/aurex/BEC.html):

 

 

According to Aurex, apparently this allowed them to achieve what is equivalent to a polarizing voltage in the 1kV range.

 

And some more photos:

 

 

 

 

 

 

 

Quote:
Originally Posted by volly View Post
 

The Aurex look sweet, the T50's have my attention. 

 

Are these hard to come by, Yaluen?

 

They probably come up for sale online every couple of years. Not impossible to find, but one does have to be diligent. For example, the HR-V9 was part of a lot of several vintage phones.

 

Quote:
Originally Posted by MuZo2 View Post
 

Fostex seems version 2. Version 1 was with split headband.

 

I think that's right, my pair doesn't have the raised lettering on the cups that says "RP" and "Regular Phase Stereo Headphone". Said raised lettering seems to be absent in photos of other v2's as well.

 

Quote:
Originally Posted by MuZo2 View Post
 

I would like to see if Fostex T50v2 compares to all other variants NAD RP-18 and if v1 is significantly better.

 

Indeed, that'd be interesting. One would hope Fostex didn't employ cost down measures other than getting rid of the raised lettering that might have compromised the sound.


Edited by yaluen - 5/12/15 at 3:14pm
post #1490 of 1493

Can you write some impressions of Fostex T50 here

http://www.head-fi.org/t/94407/planar-obsession-old-fostex-t50

post #1491 of 1493
Quote:
Originally Posted by MuZo2 View Post
 

Can you write some impressions of Fostex T50 here

http://www.head-fi.org/t/94407/planar-obsession-old-fostex-t50


Curious minds need to know!

post #1492 of 1493

 

Here my latest acquisition! Been after these for a while now. Direct from GREECE, they are made in Japan .. Audio Sonic AS-8000.. I'd like to post a picture but for some reason it says I don't have the proper permission? Oh, that's Mil Mascaras (Classic Luchador) on my mannequin head lol!

post #1493 of 1493

Sure, I'll see if I can't post some of my thoughts later on. I'll have to give them a good revisit since I haven't listened to them for a while now.

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