It's always nice to see a ending like this for sure! :2thumbsup: I'm curious as to what Bill said when you mentioned to him that the re-magnetizer may have been reversed.
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It's always nice to see a ending like this for sure! :2thumbsup: I'm curious as to what Bill said when you mentioned to him that the re-magnetizer may have been reversed.
Never heard from Bill. He fixed them, that's about it. All in a day's work, I suppose.
I've sure fixed my fair share of production mistakes. Part of doing business.
In my business I would have paid the customers cost of shipping for my mistake, but that's just me.
I told Bill what Jerry Hubbard said, and, of course, he understood the issue, he was just surprised that it could have happened. Being a small company, it's easier to pay more attention to detail and make sure things like this don't happen. But, no one's perfect, so they do sometimes...
Well I was wrong - I did hear from Bill but the email slipped by me.
He went to quite a lot of trouble and work to fix my drivers - including replacing a magnet! I've asked him for permission to post his findings here.
I knew Bill would come through.That's what happens when you deal with good PEOPLE. :2thumbsup:Quote:
Originally Posted by Panomaniac
I hate to even ask but, how would one tell if his 808-A's were done correctly?
I suppose too I ought to call and find out if they got my 416 frames ok. It's been weeks.
Yes, definitely call. The phone is how GPA does business.
OK, here is Bill's reply to me about what he found with my drivers. Bill said OK to post this.
"When I received your speakers I found that one of them had to be reconed because the speaker was packed in a plastic bag and the edge had stuck to it damaging the cone."
(note from Pano - don't put your drivers in a plastic bag!)
"So I decided I would just tear them both down, when I did I measured the magnetic flux and it was 8.0 Tesla and the polarity was backwards, the Altec spec sheet rated it at 12.0 Tesla. So I then re magnetized it twice to reverse the polarity and bring the flux back up, however it did not, the polarity reversed but the flux stayed at 8.0. I then torn down both magnets and totally de-magnetized the parts, after re-assembling them and re magnetizing them there was still no change.
I then called my magnet vendor and spoke to their engineer, he told me that I should have no trouble magnetizing the Alnico whether I torn it down or not and that Alnico should not even loose it magnetism unless it was dropped or the plates slide."
"Next I measured and weighed your magnets and the ones I currently use and they were the same and agreed with the Altec spec 2.4 pounds. So the only thing I could think of was trying a brand new piece of Alnico in your structure from my stock and when I did the gap flux went up to 10.5 to 11.0 Tesla which is lower then what Altec states but I believe to be what it needs to be."
(note from Pano: I measure a BL of 12 on each, so right at spec).
"I am now going to send in your slug of Alnico to the magnet manufacturer to let them analyze it to see why it will not magnetize. This is for my interest."
"I did not get a chance to do the T/S parameters the guys shipped it out before I had a chance. But I think it will be ok with the higher gap flux that is matched and the coil DCR is also matched."
So it does seem that there was something wrong with the Alnico slug after all.And all the re-magging will not help.Very Interesting I hope you follow up on that I'm curious as a new puppy with a new toy. :D Like to hear what they come up with on this one.
Well at least you have an operational pair of 416's now. :)