rarities
Jan 23, 2014 at 4:05 PM Thread Starter Post #1 of 18

wppk

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Hello
I am french, Living in Burgundy, and I ve been reading with great pleasure so many things on head fi ! I would like to share some experiences, and show you some rarities, that few of you must have heard of, and maybe none of you, for the LEM.
I have found two sets of headphones, one made in 1975, name of the brand : audiotec. it was french, and this society closed a few years after, victim of its own success. It made such good quality product, but in so low quantity, that it couldn't follow the orders of the buyers. this is quite confidential, but thos in france who know what this society made  ( amps, loudspeakers, turntables and headphones) know that it is really the top, the real high end.
collector items, them, which are very hard to find. I found a pair of headphones, coming with its energiser, and bought it because seeing the annoucement of this set made me curious, and I decided to read about it ( unhappilly for you, it's all in french, but that what I can tell you about it. i fact, what was very surprising is that at the time these headphones were made, stax also made some, and it was probably the sr5, or the srx. ( I have a srx mkIII) and specialised sound magazines said , making a review of both stax and audiotec , that the audiotec were better. so, stax was furious and decided to stop making any adverts in theses magazines. but they bought one of the audiotec systems, and then, corrected things on theirs in order to get back to the first place. The magazines were saying, also, that the audiotec had much more bass than the stax.
When I received them, I was then very imaptient to compare them with my srx.
  I received, then, two audiotec headphones, from the same vendor. one of them had an important imbalance, but the second one was perfectly balanced.
In fact, there was no more bass on the audiotec than on the stax. and they had a weakness compared to the stax. the enregiser was not to be plugged on electricity, just to the loudspeakers. Which I found odd, because I had seen the electronic scheme before buying, and there was eanelectric supply.... the result was that the level of the audiotec couls not reach the power of the stax. but still could be heard loud enough, even if one would have probably been pleased to have a reserve of power. the very good point, for the audiotec, was that I found the mids and highs much more detailed than in the stax. more pleasant, too, and understood that it was the point that made the magazines say that they were better. they were, indeed, but not on the total band. even laking a bit bass, compared to the stax.
They are old-looking, of course, but they are very pleasant to listen to.
I will leave photos as soon as I manage to find how to do it on head fi. I did it long ago for my sxr, but I will have to remember.
 
another antiquity/surprise came also. I found a very strange headphone set ( still electrostatic) the LEM er 903. what was very strange was that I couldn't find anything about it on the net, and still couldn't since then. ( I have told about those two set to spitzer, who very kindly answered to me that he had never seen the audiotec, but he didn't tell me about the Lem yet.
the lem has a very small energizer, that has has no electric supply neither. when I plugged it, I was quite desappointed, because LEM , in France ( I don't know elsewere) is a very well know microphone maker for the professionnal. theirs mics are still used in national radios, for instance. the sound of the headphones was rather flat, and seemed even quite poor, for an electrostatic. but could be put in front of some dynamic models, except for the power, whixh was not very important. 
but It would be intersting to know if other persons hold this piece of history, and what they know about it.
 
on another point, I will leave pictures of my personnnal handcraft made tube amp. It was made by a french electronician, who since then became a friend of mine, and he made it to fit perfectly my sennheiser HD 800. as it is the only one in the world, and experimentally hand made, it does not look like a brand new amp from woo audio. Lol. But I love the sound it gives. It is very powerful, and I can plug also my akg k340 on it, which sings, then, even if the akg is much harder to drive.
if you are interested in  having one, I can tell my friend. I couldn't compare this system to the dedicated sennheiser, 'cause I don't have it... but I find its sound amazing.
 
BTW, I am a sound engineer, producer, voice talent, for pro broadcasting, movies, tv, and so on. and I am passionated about sound.
 
also, just for the detail, I bought lately a baby orpheus with its hev 70, and a Stax srm T1, with a pro lambda signature. My friend is going to make an adaptor for the baby orpheus to be plugged on the stax amp. Then, as many of you say, probably I will then take the best of the baby O, which is very good already, with the hev 70.
 
all the best to all of you !
 
and please, sorry for my mistakes in writing. don't forget you're reading a froggy !
 
 
 
Jan 23, 2014 at 4:13 PM Post #2 of 18

so this is the audiotec energiser. On it you can change the phase.
 

 
 the audiotec
 


the audiotec plug

 
the LEM ( I changed the pads but still have the old ones)


the lem energizer

 
back of the energizer
 


the original explanation in the pack
 
 


the amp for the HD 800
 


closer
 
Jan 6, 2015 at 4:54 PM Post #3 of 18
Thanks for uploading!
 
I know 'double posting' is frowned upon, but please could you post this stuff in the 'show us your vintage headphones thread'
http://www.head-fi.org/t/420490/show-us-your-vintage-headphones
 
There's A LOT of regulars in that thread who would love to see this stuff. 
wink.gif

 
Jan 7, 2015 at 5:42 AM Post #6 of 18
if someone wants to buy the lem, I can sell them. But I have to say that their official description and quality are corresponding to the time when they were realeased, but compared to further headphones, they sound rather poor. the audiotec are much better and very rare. I am not sure to will to sell these. but if interested, you can make an offer, will see if It can do. sorry if waht I say here is not at the right place. I am not really trying/decided to sell them. it depends on your interest. Thank you for understanding.
 
Jan 7, 2015 at 6:06 AM Post #7 of 18
Here you go : 
 
LEM : Electret headphone (ER 903) 
 
Presentation : Based on the capacitive principle and the electret effect this high class stereophonic headphone is intended for high end acoustic quality. 
Thanks to his low oscillating mass, this open headphone present an amazingly natural and delicate acoustic scene, both in the lows and the highs.
With a relatively light weight of 300gr and a low but well distributed pressure on the ears, this headphone is very comfortable for long listenings.  
For his common use he's combined with an adptator ref. AD915 which is  connected to the speakers of your stereo system without any need of power supply.
 
Specs
 
ER 903 headphone
 
Principle : electrostatic, electret effect.
Capacity : 40 pF (cable included)
Frequency range : 20 to 22.000 Hz
Efficacity at 1 Khz : 95 dB / 100 V input effective
Maximum acoustic pressure : 120 dB
Distortion at 115 dB : < 1%
Cable Length : 2 metre 
Weight : 300 gr (with cable)
 
AD 915 adaptor
 
Input impedance : 4 to 16 ohms (connected to HP output)
Maximum input power : 6,3 V (5W)
Frequency Range : 18 to 22 Khz
Distortion : 0.3%
Input cable length : 1 metre, equiped with DIN HP 41529 plug (screw fixation type)
Adaptor dimensions : 68x59x114 mm 
Weight : 580 gr
 

 
Jan 7, 2015 at 6:52 AM Post #8 of 18
Any more details on the amp? It looks very interesting.

Is it your own design?
 
Jan 7, 2015 at 10:47 AM Post #9 of 18
Sorry I have nor particular details. I Had it made by a hi fi repairer to whom I asked to make an amp really dedicated to the hd 800. He made the design.
tested different bulbs. found the best settling, I think. 
 
Sep 28, 2016 at 6:16 AM Post #10 of 18
Hi there, head fiers !
I found senn headphones in a garage sale, (sennheiser hd 455) and cannot find them anywhere on the internet.
It seems to be rarities too, or I have missed something in my search. has anybody heard of these ?
thanks for watching
 



 
Sep 28, 2016 at 7:16 AM Post #11 of 18
Definitely harder to find than the HD320, but not unheard of.
Typing "hd 445" into a certain reputable search engine that rhymes with 'foogle' gives me plenty of results.
 
some infos i founded on teh interwebz:
 
■ impedance 60Omu 
■ playback frequency band 18-21,000Hz 
■ permissible input 100 mW (DIN45580) 
■ sensitivity 94DB / MW 
■ code 3mOFC stereo 3.5 / 6.3mm plug 
■ Weight 120G 
■ released July 1995 
■ discontinued 1998-99 circa 
 
 
Sep 28, 2016 at 7:27 AM Post #13 of 18
Ok, that's pretty weird...  here, try this:
https://www.google.com/search?q=hd+455&rlz=1C1HIJA_enDE657DE657&biw=1879&bih=914&source=lnms&sa=X&ved=0ahUKEwicubfJ-bHPAhXJXBQKHeYSAwQQ_AUIBygA&dpr=1
 
Oct 16, 2016 at 1:17 PM Post #15 of 18
Hi there ! I found this afternoon, in a garage sales, what appears to be another rarity. A very old akg with a strange 6 pins plug. It seems like coming straight from the fifties.


I've never seen that model before, even on the net.
 

inside the earcups, the yellow foam is falling into pieces, of course, and the drivers are very oddly held by a thick rubber. After a little while, I understood that the knobs on the outside of the cups, are moving the rubber, then the drivers inside when turning them, so that the drivers get closer or not to the ears.
it is wired in mono.
I recabled it, in stereo, with a jack, and tested it. one of the drivers was dead. nothing to do to make it work.... I had a driver from a sony mdr 40 , wqhich had been waiting lonely for years in my cupoard. took it, and, amazingliy, it just fitted the other, as well for dimensions as for the balance.
now, the headphone works, and it is funny to listen to this piece of museum. Gee, that's how sound was in the fifties, I figure, then. The mids are very present and clear, but even booming.... the bass and highs are mostly gone with the wind, compared to the mids. But not unpleasant to hear, I must say. It's an AKG, man !
must have been very useful for a mix, in the time of the platters, but I guess better phones existed then, because when you listen to " sixteen tons" and compare this song to what's recorded nowadays, very very enigineers reach this rare quality !
has anybody seen these, got these, know their very mark ( no number or other letter anywhere on it...) ?
oh, BTW, these cans are not unpleasant to listen to, but It seems obvious that after a real long time, it will make ears ache. much too strong pressure on ears. And weird to notice, too, that the pads, which are surely original, are in good shape... they knew how to make padss last, in those times, and that is something that has desappeared on the market. To sell heaps of pads ?
 

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