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Coil length for ar 2ax woofer


Guest thebluecrocodile

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Guest thebluecrocodile

I need to rewind the voice coil on a 2ax woofer (dated 1966) as the old one burnt up long before I got the speakers. I measured the diameter of the wire at .010 (AWG 30) but since the coil was such a mess I am unable to determine the number of windings on the voice coil. Does any one have any experience with this (the total length of 30 AWG to do this rewind would also work). Many Thanks, Rob

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>I need to rewind the voice coil on a 2ax woofer (dated 1966)

>as the old one burnt up long before I got the speakers. I

>measured the diameter of the wire at .010 (AWG 30) but since

>the coil was such a mess I am unable to determine the number

>of windings on the voice coil. Does any one have any

>experience with this (the total length of 30 AWG to do this

>rewind would also work). Many Thanks, Rob

Rob,

You would be much better off trying to locate another woofer on eBay than to go back and re-wind a voice coil. It is a daunting task, not unlike re-inventing the wheel. You really need to be able to bake the windings with a special glue, and the voice coil should be wound on a "coil winder" in order to get the windings even and uniform (so they don't drag in the gap), but if you insist, here goes:

AR-2 Alnico Woofer (1957-1969):

DC Resistance = 5.5 ohms

Inductance (voice coil stationary) = 1.7 mH

Force/Ampere = 1.43 lbs/amp

Total number of turns = 120

Flux in gap = 9,500 gauss

Total weight of assembly = 3 lbs., 1.5 oz.

Coil former = phosphor bronze

Coil outside diameter = 1.340 inches

Coil length = .656 inches

gap inside diameter = 1.277 inches

gap outside diameter = 1.377 inches

gap clearance = 0.100 inches

Good luck!

--Tom Tyson

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>>I need to rewind the voice coil on a 2ax woofer (dated

>1966)

>>as the old one burnt up long before I got the speakers. I

>>measured the diameter of the wire at .010 (AWG 30) but since

>>the coil was such a mess I am unable to determine the number

>>of windings on the voice coil. Does any one have any

>>experience with this (the total length of 30 AWG to do this

>>rewind would also work). Many Thanks, Rob

>

>

>Rob,

>

>You would be much better off trying to locate another woofer

>on eBay than to go back and re-wind a voice coil. It is a

>daunting task, not unlike re-inventing the wheel. You really

>need to be able to bake the windings with a special glue, and

>the voice coil should be wound on a "coil winder" in order to

>get the windings even and uniform (so they don't drag in the

>gap), but if you insist, here goes:

>

>

>AR-2 Alnico Woofer (1957-1969):

>

>DC Resistance = 5.5 ohms

>Inductance (voice coil stationary) = 1.7 mH

>Force/Ampere = 1.43 lbs/amp

>Total number of turns = 120

>Flux in gap = 9,500 gauss

>Total weight of assembly = 3 lbs., 1.5 oz.

>Coil former = phosphor bronze

>Coil outside diameter = 1.340 inches

>Coil length = .656 inches

>gap inside diameter = 1.277 inches

>gap outside diameter = 1.377 inches

>gap clearance = 0.100 inches

>

>Good luck!

>

>--Tom Tyson

Hi Tom;

You are such a wealth of factual archival information, thank you.

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Guest thebluecrocodile

Wow. That is good info. Very much appreciated. By the way, I agree with you that the task is a tough one. Unfortunately, I just can't resist the challenge.

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