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View Full Version : Flux density and gap geometry, 123A vs. 122A?



GordonW
03-20-2005, 07:29 PM
Hey, does anyone have the data on the flux density and gap geometry, for a 122A vs. a 123A? From the naked eye, these look like "compatible" baskets... but the question is, is the magnetic strength comparable?

Actually, if not the 122A, if anyone could compare the 123A/2212 magnet assembly to any of the foam surround 12" diameter, 3" coil drivers (122A, 126A, 128H, 129H), that would be good. Just trying to get an idea if a 123A could be reconed as a 122A or 126A...

Regards,
Gordon.

Earl K
03-21-2005, 04:44 AM
Hi Gordon,

Gap Geometries ; from 1977 ( couldn't reference 2213 gap info, though the implication is .048" ) - see Giskards post

.044" : 2212, 123A-1, 126A
.048" : 123A-3
.053" : 122A

- sort of following JBLs' logic from the 1984 "Goes Into List"

C8R2212 : 123A, 123A-1, 2212, 401-133 ( Heathkit )
C8R2213: 123A-3, 2213, 2213H
C8R126A: 126A, ( NLA I believe )
C8R128H: 128H
C8R129H: 122A, 122A-1, 129H

Flux Density : in tesla

1.00 : 123A, 2213, 2213H,
1.07 : 2214H, 128H,
1.08 : 122A,

BL Product: in T*m ( this will give you an idea how much wire length is stuffed into those gap areas )
8.9 : 123a, 2213, 2213h
16 : 122a, 128h, 2214h

Re: in ohms ( another somewhat indirect indicator for total winding length of VC wire )

4.4 : 123a, 2213, 2213h
5.6 : 2214
5.7 : 122a, 128h,

:)

4313B
03-21-2005, 05:35 AM
( couldn't reference 2213 gap info )0.048