I don't get Altec pricing. I see it high, high - but it never is when I want to sell my stuff. 😡
Hello Altec fans... Are copper foil inductors a good idea for vintage Altec or GPA woofers and compression drivers? Or should I just use air core inductors like Solens? What are the performance pros and cons besides cost?
Having used foil coils a few times, I don't hear the advantage. And I've heard many Altec based systems that were stunningly good using normal Solen or Erse, Jantzen coils.
On the other hand, I have friends who's judgment and hearing I trust who like the foil.
For me, they don't offer an improvement.
On the other hand, I have friends who's judgment and hearing I trust who like the foil.
For me, they don't offer an improvement.
Copper Foil vs Copper wire
This is one time I may disagree with Pano.... with caveat(s) ... It has been my experience that there are some sonic improvements with foil over wire assuming same gauge when larger values are required, say .75 MH and larger. This also assumes the inductor is used in series with the driver. I perceive better resolution in mid range frequencies from around 500 Hz up to about 5Khz. YMMV
This is one time I may disagree with Pano.... with caveat(s) ... It has been my experience that there are some sonic improvements with foil over wire assuming same gauge when larger values are required, say .75 MH and larger. This also assumes the inductor is used in series with the driver. I perceive better resolution in mid range frequencies from around 500 Hz up to about 5Khz. YMMV
Greets!
In theory, the 'tighter' the ctc spacing the greater the HF resolution, so normally wouldn't see the point with vintage horns, but if willing to spend what it takes to shift it lower, then in theory looking at a similar improvement to between a round vs flat wire VC coil.
GM
Thanks Pano and John...
I might take the try and listen route first. So round wire for me first before I try the more expensive foils.. Besides, with the values I need, the foil option would be ‘special order’ items since they are not always in stock.
I might take the try and listen route first. So round wire for me first before I try the more expensive foils.. Besides, with the values I need, the foil option would be ‘special order’ items since they are not always in stock.
Same typeface, ink, and similar to the early 80's 515-8G which I just pulled out: 1803035662
Your example appears double stamped at the end, or has extra digits or such.
@kec
"As a former Altec employee (1978-1982) I have a real fondness for the Altec sound and their products. This was my first job right out of high school. I worked on the speaker/driver production lines and could do every phase of building drivers - which is why I eventually became a lead person."
Forgive me if this has been brought up before but could you shed any light on the surround coating used for instance on the 416-8Z?
Thanks
"As a former Altec employee (1978-1982) I have a real fondness for the Altec sound and their products. This was my first job right out of high school. I worked on the speaker/driver production lines and could do every phase of building drivers - which is why I eventually became a lead person."
Forgive me if this has been brought up before but could you shed any light on the surround coating used for instance on the 416-8Z?
Thanks
Original [NLA]: Who has done this ?........ ( Older ALTEC Woofers )
EPA water based replacement: Speaker Repair Adhesive, Sealer, Cloth Surrounds, Foam Surrunds, MI-1291
GM
EPA water based replacement: Speaker Repair Adhesive, Sealer, Cloth Surrounds, Foam Surrunds, MI-1291
GM
@kec and @GM
The reason I'm interested is because I acquired some 846B's which apparently sat around for a quite a while. The surround goop is that super tacky tar like stuff which has run down and some has dribbled onto the chassis and wood. I can clean the dribble up but it is a bit thin further up the surround.
As I said it is black not clear and I have been led to believe that one can't put the current goop over the old stuff.
One helpful individual said, "Just get them reconed". Yeah, that's not cheap and they work fine they just need a touch up.
Any ideas?
Thanks,
Chris
The reason I'm interested is because I acquired some 846B's which apparently sat around for a quite a while. The surround goop is that super tacky tar like stuff which has run down and some has dribbled onto the chassis and wood. I can clean the dribble up but it is a bit thin further up the surround.
As I said it is black not clear and I have been led to believe that one can't put the current goop over the old stuff.
One helpful individual said, "Just get them reconed". Yeah, that's not cheap and they work fine they just need a touch up.
Any ideas?
Thanks,
Chris
maybe Rotate them 90º instead
...and wait.
...a while.
World's slowest-moving drop caught on camera at last : Nature News & Comment
...and wait.
...a while.
World's slowest-moving drop caught on camera at last : Nature News & Comment
I was going to do that anyway but I might not live long enough to see it move.
Also the stuff that ran down onto the baffle would need to be replaced.
I may just get some MEK and see if I can thin it out and encourage the goop to move around before the MEK evaporates.
The nice folks at GPA knew MEK was the solvent/carrier but didn't know what the actual black sticky stuff was used. At least the AR and KLH guys know that their goop is Butyl rubber with Toluene as the solvent.
Chris