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AR 3A tweeter problem


carlbarry

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8 hours ago, JKent said:

Some pots can be rebuilt and some are too far gone. I used L-pads in my 4x's. It was my first restoration. If you want authentic pots the ones from Chris1this1 are worth a try. While you're in there be sure to replace the capacitor. You'll need one 20uF per speaker.

Thanks!

I'm not looking forward to it.  It was tough enough working through the 12" hole of the 3As.  Working through the relatively small hole of the 4x, yikes.

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4 hours ago, carlbarry said:

Thanks!

I'm not looking forward to it.  It was tough enough working through the 12" hole of the 3As.  Working through the relatively small hole of the 4x, yikes.

It's not that bad. The xo is very simple and some of the work can be done outside the box. Cut the leads off the wax capacitor but leave it in place. 

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On 3/27/2020 at 3:36 PM, carlbarry said:

The HiVi option seems very good to me.  I used to be able to hear 20 kHz on the test records, but not any more!

If that is the solution, I'll do it.  Thanks.

I would like to know what a good test record is for assessing my hearing please.

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On 3/30/2020 at 8:03 PM, JKent said:

Pretty much drop-in. You just put a 0.05mH coil on the back of the tweeter.

Q1R1 resized.jpg

I just received my HiVi Q1R.

The holes on it don't match up with the holes in the cabinet. Nor are they big enough for the screws.  

Should I drill new holes, or try enlarging the existing holes?  I don't think enlarging the holes will work, as the diameter of the mount is smaller than the original.

And another little catch: the coil's leads are very short, so I will have to solder on extensions to be able to mount on the rear.  I thought I could mount it alongside the terminals, but I don't think it would then fit in the hole.

Thanks.

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7 hours ago, carlbarry said:

The holes on it don't match up with the holes in the cabinet. Nor are they big enough for the screws.  

Should I drill new holes, or try enlarging the existing holes?  I don't think enlarging the holes will work, as the diameter of the mount is smaller than the original.

CarlBarry

Use this thread  as a guide

 

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On 6/12/2020 at 10:54 PM, Aadams said:

CarlBarry

Use this thread  as a guide

 

Thanks.  But the thread doesn't address my issues.

I think I will make a clear plastic template from the hole in the AR 3A with the tweeter removed, mark where the screw holes are in the cabinet, and then place it on the new tweeter and see if I can drill out the existing holes.

Funny thing about the gasket that came with the tweeter: the holes in the gasket line up with the holes in the tweeter, but the notch for the terminals don't line up with the terminals.

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1 hour ago, carlbarry said:

Thanks.  But the thread doesn't address my issues.

I think I will make a clear plastic template from the hole in the AR 3A with the tweeter removed, mark where the screw holes are in the cabinet, and then place it on the new tweeter and see if I can drill out the existing holes.

Funny thing about the gasket that came with the tweeter: the holes in the gasket line up with the holes in the tweeter, but the notch for the terminals don't line up with the terminals.

It can be done. See photos in this listing: https://www.ebay.com/itm/ACOUSTIC-RESEARCH-AR-3A-TWEETER-REPLACEMENT-FRONT-WIRED-CONFIGURATION/192876357048?hash=item2ce853a5b8:g:lZgAAOSw5cNYE3fz

Alternatively, you can simply use the existing screw holes in the tweeter flange with aggressive thread screws: https://www.parts-express.com/parts-express-6-x-3-4-deep-thread-pan-head-screws-black-100-pcs--081-435

Make your own holes in the gasket.

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7 hours ago, RoyC said:

It can be done. See photos in this listing: https://www.ebay.com/itm/ACOUSTIC-RESEARCH-AR-3A-TWEETER-REPLACEMENT-FRONT-WIRED-CONFIGURATION/192876357048?hash=item2ce853a5b8:g:lZgAAOSw5cNYE3fz

Alternatively, you can simply use the existing screw holes in the tweeter flange with aggressive thread screws: https://www.parts-express.com/parts-express-6-x-3-4-deep-thread-pan-head-screws-black-100-pcs--081-435

Make your own holes in the gasket.

Aha, yes, the holes are enlarged.  Thanks.

My father was a shop teacher, and always said, "Measure twice, cut once."  In this case, my feeling was, "Ask people who have already done it, and drill once."

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