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Altec 288 centering

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Posted on August 2, 2015 at 14:56:48
horny
Audiophile

Posts: 745
Location: holland
Joined: October 17, 2003
 hello one of my Altec 288 8g (ceramic magnets)
drivers has no nice centered gap any more
i try to loose the pole plate by unscrewing the 3 bolts but i can't move the pole plate
is it glued ?
and is this the good way to get an centered gap again ?

 

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RE: Altec 288 centering , posted on August 2, 2015 at 19:23:55
ferber81
Audiophile

Posts: 15
Location: waveland, MS
Joined: February 15, 2010
 Call Bill at great plains audio.

 

RE: Altec 288 centering , posted on August 2, 2015 at 19:50:22
unclestu
Dealer

Posts: 5851
Joined: April 13, 2010
 Pole plate is glued and the pole piece tack welded. Its damn near impossible to move that pole piece. I had the same issue with a 10 inch Alon Alnico woofer, could barely move the piece and when I did it just slid to the other side. Still got it hoping for inspiration.

 

Used, posted on August 2, 2015 at 20:04:21
djk
Manufacturer

Posts: 6135
Joined: June 17, 2000
 Considering you will need a new diaphragm, as well as paying shipping both ways to GPA for the repair, you may be better off buying a used one.

 

Maybe better to go withe a new GPA 288-8 drivers?, posted on August 2, 2015 at 20:15:30
Cougar
Audiophile

Posts: 4592
Location: SoCal
Joined: June 25, 2001
 Talk to Bill at GPA. he is a really nice and straight forward guy. maybe he can help you with you Altec 288 problem.

I recent purchase a pair of GPA 902's and they are way better than the Altec 902's I had in my model 14s.

I'm back in musical heaven with the GPA 902's

 

RE: Altec 288 centering , posted on August 2, 2015 at 23:41:17
horny
Audiophile

Posts: 745
Location: holland
Joined: October 17, 2003
 thanks i buy these drivers 2 months ago
and order new diaphragms for it from GPA
when i put them in i see this, the voice coil is not rubbing and works but
i see that the gap was not totally centered from one
and i like to have it 100%

 

RE: Altec 288 centering , posted on August 3, 2015 at 03:04:48
horny
Audiophile

Posts: 745
Location: holland
Joined: October 17, 2003
 hello Stu
I think you should not try this too alnico pieces they loose the magnetic force then but you can always zap them again
If i get the pole plate loose i can made a copper ring and use it as a mandrell to made the position and fix the screws again.
i have the machinery for that i am an instrument maker.

 

RE: Altec 288 centering , posted on August 3, 2015 at 17:02:04
Coner
Audiophile

Posts: 3703
Location: S.W. Washington state, USA
Joined: November 17, 2001
 Just do not loosen the bolts, you'll make things worse, trust me.
Then you'll have to send it to GPA!!!,

If it's NOT rubbing, go ahead and use it... it won't otherwise
affect the audio quality.

 

RE: Altec 288 centering , posted on August 4, 2015 at 08:55:36
merdy
Audiophile

Posts: 1625
Location: New paltz,ny
Joined: July 25, 2001
 i have over the last 30 yrs seen sooo many non centered but not shifted or touching the body,as long as there is enough room for movement, the movement is so tiny its hard to even see with the naked eye
mark with a sticker or sharpie the location and point it close to the sky ,many reasons for this if there is dust it will fall down any gunk from vc heat will also end on the wider side ,gravity is your friend.

just make sure its clean as hell using card stock, masking tape and a air duster

use a paper shim to make sure the outside edge is close to the body as acceptable and then tighten to avoid vc rub.
are you using original dphrams or after market,
i use 288g and 288c on 1505 tar and 203b respectively


Silence is golden duct tape is silver

 

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