ESS AMT Heil Ribbon Tweeter without Model Number (used in ESS PS9a)

[tiefbassuebertr]

This tweeter needs service. Who knows the model of this tweeter? It is in use by follow ESS speakers
ESS PS9A speakers pair with air motion transformer tweeters Photo #219772 - Canuck Audio Mart
and
http://i.ebayimg.com/00/s/MTIwMFgxNjAw/z/8KoAAOSwoydWqRNJ/$_1.JPG
Here pics of the tweeter itself:
http://img.canuckaudiomart.com/uploads/large/86840-ess_heil_ps5a_speakers.jpg
http://bilder.hifi-forum.de/medium/178783/ps8a_244986.jpg
There are no informations under
Heil AMT – ESS Labs., LLC
Maybe it is the predecessor of the AMT-2 - go to
LSV Dieter Achenbach
If I have the model number, I hope to find the instruction manual for disassebmly and reconing.
Thanks for your advices.

 

[Thatch_Ear]

What is wrong with it? I think if it is open in front and back there is only one size diaphragm in differing resistance for Xovers. Later there were 2 sizes, but the shorter ones were only for front firing AMTs. I think now you can only get them from Germany and won't be cheap. Try the search.

Thatch

 

[Thatch_Ear]

I was reading some other AMT threads and found this (ESS Speaker Diaphagms and Parts ). You can buy AMT-1 diaphragms here. I don't know a thing about model numbers. I have 4 pairs of AMT-1s and 2 types of the smaller front firing AMTs, never had to do a thing to any of them. They do come in a variety of impedances though.

 

[tiefbassuebertr]

What is wrong with it? I think if it is open in front and back there is only one size diaphragm in differing resistance for Xovers. Later there were 2 sizes, but the shorter ones were only for front firing AMTs. I think now you can only get them from Germany and won't be cheap. Try the search.

Thatch

One devicve has too low efficiency. The question is, which steps are to perform for opening/dismanteling for replace the diaphragm. To find out this I must have an instruction manual. To order or find such an instruction manual, I must know the exact model naming. Therefore the quesstion in post #1.

 

[VaNarn]

Is this it? HUMAN Speakers: ESS Speaker Repairs Strange,not a hammer in sight.

 

[tiefbassuebertr]

Is this it? HUMAN Speakers: ESS Speaker Repairs Strange,not a hammer in sight.

yes. What is the model naming?

 

[VaNarn]

Originally the Heil AMT units were only sold as complete speaker systems by the ESS company.At one stage the only model description given indicated the effective area of the pleated diaphragm as being twenty one and a half square inches or as ten and half square inches. In Post #3,Thatch-Ear has supplied the link to Simply Speakers and they list 3 diaphragms from the re-established ESS factory together with their dimensions and the speaker systems that used them.I would suggest that you remove a diaphragm and measure its' dimensions to confirm the physical size as it does pay to be cautious,and order a replacement to suit.