TAD ET-703 question

[heifisch]

Hi all,
I am a new member here, after reading for a really long time.
I like to build my own hifi and I live in germany. I want to use the above mentioned driver for my horn system.
And maybe I want to tweak it. I would prefer spherical horns above the horn coming with the ET-703.
Here in germany we have the metric system and thats why I know nothing about the screws used by TAD.
Is there anyone out there who can give me the correct name of the 4 screws used in the front of the ET-703. This would make it possible for me to buy 8 screws.
Thanks
Heiner

[matsj]

http://www.soundworks-pa-shop.de/images/product_images/popup_images/1406_1.jpg

4 M5.

mats

[heifisch]

Hi mats,
the paper you have posted is misleading. It is true the "cage" for the ET-703 is mounted with metric M5. But the horn in front of the driver is mounted with imperial screws.
Hopefully there is an ET-703 owner out there in the "imperial" part of the world.
Heiner

[matsj]

Sorry, my mistake. I can have a look when i comes home.

M4x0.7 but i forgot to measure how long it is.

mats

[heifisch]

Sorry Mats,
I do own a ET-703 and it is definitely not M4 (if this means metric and it does in germany) it is a kind of imperial screw. The length is not so important. It is only the imperial name of size and pitch and so on to be able to buy such a screw in GB or oversea.
I do not know the right english expression but I try: It has 36 turns per inch maybe this is called pitch.
Thanks für you investigation. Maybe TAD changed the screws sometime ago.
Heiner

[matsj]

If you calculate a inch/thread per inch you get, 25.4/36 =0.70. Yes it´s metric.

mats

[Mr. Widget]

Maybe TAD changed the screws sometime ago.Possibly. I would be surprised if they were not metric, however I suppose if you have a very early one they might have used an SAE thread. (Society of Automotive Engineers). Some of TAD's early design team were US.

If you are near a major city perhaps you can find an import car repair shop that works on US vehicles. They would likely have the measurement tools to verify thread size and pitch.


Widget

[heifisch]

Mats, thank you, it really sounds like metric. I have already been to a shop in my town and they could not identify the screw. But there is a big special shop in the next town less than an hour away and I will try there. Now I am optimistic again to find the right screw.
I like the idea with the import cars aswell, thanks for that. My ET-703 is really new and therefore it is possibly metric and I just did not recognize it.
Heiner

[matsj]

Since you have the screw it´s easy to try with a nut. How long do you want them to be ? I have some M4 at work and i can send you some if you want.

mats