Altec 604 C diaphragm differences - Help

[HeathKitPat]

The motor in the one could be a little weaker as well... They are 50 years old.. They could probably both use a re-magnetization. You will never really know until you open them up and check the diaphragm part numbers to confirm.

Although this is quite possible, they are both 1957 production dates and they have been together since new which means they were exposed to the same atmosphere, storage, usage etc.. I would hope that even if a little weak that they are equally weak.. If they came from two different sources I would be more inclined to go along with this theory.

Also given that these are pristine 604c's with original cones in excellent condition they will probably never come back out of my 606 cabinets and definitely will never make any kind of journey in a shipping crate anywhere to get remagnetized. eek: I'd be too afraid of something happening to them. Only way they will ever have the luxury or demagnetization is if I can drive them somewhere myself..

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Probably explains why was mine missing after it went to GPA.

If I sent a speaker out with a perfectly fine diaphragm I think I would get the old part back!! especially given the rarity and price of an original fram!

[cradeldorf]

Although this is quite possible, they are both 1957 production dates and they have been together since new which means they were exposed to the same atmosphere, storage, usage etc.. I would hope that even if a little weak that they are equally weak.. If they came from two different sources I would be more inclined to go along with this theory.

Also given that these are pristine 604c's with original cones in excellent condition they will probably never come back out of my 606 cabinets and definitely will never make any kind of journey in a shipping crate anywhere to get remagnetized. eek: I'd be too afraid of something happening to them. Only way they will ever have the luxury or demagnetization is if I can drive them somewhere myself..

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If I sent a speaker out with a perfectly fine diaphragm I think I would get the old part back!! especially given the rarity and price of an original fram!

I can assure you they'll never see my business again, The only reason I sent it was in case they needed to be rebuilt so they would both sound the same. Over 500 bucks in shipping, took at least 4 calls to them to get them on their way back home. They were done the first time I called, three weeks later I was still calling. and in the end I see the phram replaced in the one I told them had nothing wrong with it. just my .02

[alancohen]

All this phram talk got me wondering about what I have in mine. I have 604Ds which are similar to late model Cs. I popped the cap off the back, but didn't have time this AM to go further.

These are my phrams:



Is there a number printed in the other side? Can I remove it safely?