ribbon tweeter

Andy Bartha · 17th August 2007, 07:43 PM

I have a unkown manufacturer blown ribbon tweeter out of a Audio Mecca Megatrend speaker from the mid 8O's. Does anyone know made this tweeter or point me to someone who can repair ribbon tweeters.

drumheadz · 18th August 2007, 10:15 AM

Could you post a pic? Cheerz

Andy Bartha · 20th August 2007, 07:12 PM

picture of the Ribbon tweeter

tinitus · 20th August 2007, 08:11 PM

Gamma is an eastern europe copi of the famous Decca, looks like that - I know the inside of a Gamma, but not the Decca

Magnets may be cobolt or even alnico, I dont know - front poleplate could be special too

[Ro]Sharky · 20th August 2007, 08:14 PM

i think u have the same model as i do

http://i14.tinypic.com/62yczo2.jpg

Mine are bulgarian tweeters made after goodmans specifications.
The foil is made out of plastic with a metal coating.
I don't know how u can build something like that.

You can try cutting a piece of aluminium foil and mount it between the two screws.
You will have to make sure that the impedance of the repaired tweeter has reasonable values.
Put a resistor (10ohm) in series with the tweeter, and connect them at a sinusoidal voltage source from 2kHz to 20kHz.
Check the voltage on the resistor and compare it with the voltage on the tweeter. The ratio between them is equal with the ratio of the resistor's and the tweeters impedance value. It should be greater than 0.3. Otherwise your amplifier will see a very low impedance and

good luck!

Andy Bartha · 20th August 2007, 08:31 PM

From your picture it looks like you are right they are the same. Can you supply me the name of the manufacturer and an e-mail address. It would much easier to replace the ribbon than whole tweeter.

AKN · 20th August 2007, 08:43 PM

Hi,

HIFI KIT in here in Sweden has had Gamma units in stock since they opened the shop in the mid seventies.
Here's VLD13, expensive but available.
Maybe HIFIKIT have spare ribbons for sale?

[Ro]Sharky · 20th August 2007, 08:43 PM

sorry, i don't know who made them and neither their email address, if they have one and if they are still in bussiness.

I got them from a friend. They were 10$ a pair.

They sound pretty good.

Andy Bartha · 20th August 2007, 09:13 PM

4fun,
Could you do me a favor and get an e-mail address for HIFIKIT. I do not read Swedish and did not see an e-mil address. Those are the tweeters I have and they are the 16 ohm versions. I'm hoping they have replacement ribbons. Thank you for your help.

AKN · 20th August 2007, 09:40 PM

Quote:

Originally posted by Andy Bartha
4fun,
Could you do me a favor and get an e-mail address for HIFIKIT. I do not read Swedish and did not see an e-mil address. Those are the tweeters I have and they are the 16 ohm versions. I'm hoping they have replacement ribbons. Thank you for your help.

I have the mailaddress.
I cannot see their mailaddress on their site, maybe HIFI KIT wants it that way. Strange but I suppose that I should not put it in public if HIFI KIT don't.

You have no PM buttom, mail me for the address.

17th August 2007, 07:43 PM	#1
Andy Bartha diyAudio Member Join Date: Sep 2004 Location: Oregon	ribbon tweeter I have a unkown manufacturer blown ribbon tweeter out of a Audio Mecca Megatrend speaker from the mid 8O's. Does anyone know made this tweeter or point me to someone who can repair ribbon tweeters.

20th August 2007, 08:43 PM	#7
AKN Enjoy good sound diyAudio Member Join Date: Aug 2005 Location: In the middle of Sweden	Gamma Hi, HIFI KIT in here in Sweden has had Gamma units in stock since they opened the shop in the mid seventies. Here's VLD13, expensive but available. Maybe HIFIKIT have spare ribbons for sale? __________________ / Anders

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18th August 2007, 10:15 AM	#2
drumheadz diyAudio Member Join Date: Mar 2007	Could you post a pic? Cheerz

20th August 2007, 08:11 PM	#4
tinitus diyAudio Moderator Join Date: Nov 2005	Gamma is an eastern europe copi of the famous Decca, looks like that - I know the inside of a Gamma, but not the Decca Magnets may be cobolt or even alnico, I dont know - front poleplate could be special too

20th August 2007, 08:14 PM	#5
[Ro]Sharky diyAudio Member Join Date: Jul 2004 Location: Cluj-Napoca	i think u have the same model as i do http://i14.tinypic.com/62yczo2.jpg Mine are bulgarian tweeters made after goodmans specifications. The foil is made out of plastic with a metal coating. I don't know how u can build something like that. You can try cutting a piece of aluminium foil and mount it between the two screws. You will have to make sure that the impedance of the repaired tweeter has reasonable values. Put a resistor (10ohm) in series with the tweeter, and connect them at a sinusoidal voltage source from 2kHz to 20kHz. Check the voltage on the resistor and compare it with the voltage on the tweeter. The ratio between them is equal with the ratio of the resistor's and the tweeters impedance value. It should be greater than 0.3. Otherwise your amplifier will see a very low impedance and good luck!

20th August 2007, 08:31 PM	#6
Andy Bartha diyAudio Member Join Date: Sep 2004 Location: Oregon	From your picture it looks like you are right they are the same. Can you supply me the name of the manufacturer and an e-mail address. It would much easier to replace the ribbon than whole tweeter.

20th August 2007, 09:13 PM	#9
Andy Bartha diyAudio Member Join Date: Sep 2004 Location: Oregon	4fun, Could you do me a favor and get an e-mail address for HIFIKIT. I do not read Swedish and did not see an e-mil address. Those are the tweeters I have and they are the 16 ohm versions. I'm hoping they have replacement ribbons. Thank you for your help.

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