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-   -   Tannoy Mercury VC Wiring Aid Needed (https://www.audioaficionado.org/showthread.php?t=45661)

Toolbox 04-20-2019 02:31 AM

Tannoy Mercury VC Wiring Aid Needed
 
Hello fellow Tannoy aficionados,

I have a set of very old Tannoy's that I don't ever intend to let go off... They are the Mercury V1's, VR's and VC for a 5.1 setup I'm using in a small bedroom.

Late last year, my Air-Conditioner started dripping water and damaged the outer cabinet of the center speaker. It was complete warped before I even noticed.

Not giving up on my speakers, I decided to have new cabinets made for all of them. I took pictures of the disassembly process but I ran into a problem with my center... I cannot find the images of the crossover and where the terminals are supposed to go.

Which now brings me here and I'm hoping to get hep. The crossover is not labelled in any way whatsoever and I cannot make sense of which terminals are for the tweeter.

Here are the current images I have. Hopefully, someone can make sense of it. I reckon that the large terminals are for (+) and the the small ones are for (-). That's all I know.

Looking forward to hearing any ideas any of you may have. :)

I don't want to break any rules on my very first thread and cannot find how to post images so I will post this text message first and look for the Advanced Settings in the reply as stated here:

Quote:

DO NOT post active URL's to this forum from any photo hosting websites. Click on the Go Advanced button under any Quick Reply window, then click Insert Image icon (yellow square with mountain inside) to paste a photo URL in the popup window, or by copying a photo hosting website's photo URL, then paste it to the Insert Image icon popup window. Any active URL's for photo hosting websites will be deleted without notice. Repeat offenses may jeopardize membership to this forum.

Toolbox 04-20-2019 02:34 AM

https://i.imgur.com/FSQdtDil.jpg

https://i.imgur.com/2k0B3igl.jpg

https://i.imgur.com/oipL2c7l.jpg

https://i.imgur.com/giBqc1sl.jpg

Am hoping I did this properly without breaking any rules. Kindly let me know if I have done anything wrong and I will correct it right away.

Thanks a million in advance. :)

clpetersen 04-20-2019 09:40 AM

It looks like a three way crossover. There are a lot of people here who can help. My initial guess is that the top terminals are the inputs from the amplifier. A simple way would be run the the inputs from a simple signal generator and get the transfer function for each of the output pairs.

If no one has the direct information, I can give it a try. Non-destructive in any case.

Toolbox 04-20-2019 11:38 AM

Thank you for responding to my post. :)

Yes, the two wires at the top of the image goes to the amplifier, that I am sure of because its labelled.

The six wires on the left connect to the three speakers. Two of which are mid-range drivers and the third is for a tweeter. I'm afraid I don't have a signal generator unless that's a fancy name I've not heard of before.

I'm happy to hear what you think on how I can test them without breaking them. :)

clpetersen 04-20-2019 02:13 PM

Quote:

Originally Posted by Toolbox (Post 962104)
Thank you for responding to my post. :)

Yes, the two wires at the top of the image goes to the amplifier, that I am sure of because its labelled.

The six wires on the left connect to the three speakers. Two of which are mid-range drivers and the third is for a tweeter. I'm afraid I don't have a signal generator unless that's a fancy name I've not heard of before.

I'm happy to hear what you think on how I can test them without breaking them. :)

Are the mid range drivers the same? If so you could look for symmetry in the circuit. The odd man out is the tweeter. In this case it looks like the pair of wires going to the 1 ohm resistor would be for the tweeter.

Then is getting the phase (+/- correct) - you can do this by listening. I would get the mid range figured out first.
Also, you have large and small spade connectors - are the drivers (speakers) labelled? I assume they have matching male ends, so then the phase is already worked out as well.
Should actually be pretty straightforward. Start with very low volumes.
I have access to a signal generator if you want to send over the unit. May take few days to have some time. But simple enough.

Also, a picture of the bottom of the board would be helpful. Your pictures are huge - try resizing before posting.

Toolbox 04-21-2019 02:14 AM

Thanks again for helping. I will get more images later tonight and post them here for you to see.

To answer a few questions: Yes, the mid-range drivers are the same size and are identical speakers. Each of the 3 drivers has a large and small spade connector. However, they are not labelled.

Thank you for offering to send the drivers over to you but I live in the Philippines and I'm guessing you're either in Europe or the US which is a bit of stretch. :)

Anyway, I will post more images later.

As always, I appreciate all the aid you are extending my way. :)

clpetersen 04-21-2019 11:43 AM

OK. Don't ship it! Not needed anyway.
So, here is what I would try:

1. Find a CD with test tones on it, or perhaps computer generated tones. You want to go from say 40 Hz to 5 kHz or higher.

2) Take one of the mid range drivers and hook it to a pair of terminals. Test tone to amplifier, then to PC board input, or perhaps direct from computer to input, depending on how you are using the tones. Start with the very lowest volume you can hear clearly (this will be a tiny amount of power - just a few milliwatts, so no danger)

3) progress up the frequency range, say 40, 50, 60, 70, 80, 160, 320, 640, 1280,....

4) For the midrange drivers you should hear the speaker come on at a low frequency then go off at the upper cutoff (maybe around 2 kHz). Switch outputs after you note the frequencies.

5) the tweeter output should start to come on above 1 KHz. The midrange driver may not work too well at the higher frequencies but doesn't matter.

6) you now have the outputs identified. Plug in the tweeter to the tweeter output and confirm high frequency operation.

7. All set.

Antonmb 04-21-2019 11:55 AM

I may have missed it somewhere, but have you contacted Tannoy? Maybe they can send you a wiring diagram.

Toolbox 04-22-2019 04:23 AM

Thanks a million, clpeterson... I will definitely try that out and will let you know how it goes. For the times being, here are the images you asked for:

https://i.imgur.com/PALfZnul.jpg

https://i.imgur.com/olbIaxil.jpg

https://i.imgur.com/dPuYLDAl.jpg

https://i.imgur.com/583LPwJl.jpg

Hope this helps.

Antonmb, yes. I did try that but on their website, I need a serial number for the speakers and that was destroyed with the water leak. :)

clpetersen 04-22-2019 08:57 AM

Quote:

Originally Posted by Antonmb (Post 962277)
I may have missed it somewhere, but have you contacted Tannoy? Maybe they can send you a wiring diagram.

Anton - You mean like a manual? I have heard of those.... :)

Toolbox - Thanks for the bottom photo. It is different than what I expected, but not an issue. Basically, the large areas are copper, separated by thin traces of 'no copper'.
So, the neighboring wire pairs are in electrical contact with each other - you can verify with a an ohm meter if you have one.

I would try Antonmb's suggestion - send the photos of the board to customer service at Tannoy, hopefully someone will recognize it.

if not, given the top and bottom photos, and the simplicity of the circuit, it can be reconstructed and the wires identified. it would take a few minutes.

but try Tannoy first.


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