909-8A: 400Hz tractrix horn?

**Altec Best** · October 25th, 2012, 03:43 PM

It's better to link into them from a photo site like (photobucket,Flickr,) by posting the full size IMG code.This site has a auto resizer that makes them smaller.

**jmarkwart** · October 26th, 2012, 11:41 AM

Adam,

Check out this Sound Practices article about Altec 909s, 515-8Gs and tractrix horns.
http://home.earthlink.net/~jmarkwart...spexemplar.pdf

Jeff

**adam_ecofan** · October 26th, 2012, 02:44 PM

hi jeff,

thanks for the link - actually, the exemplar is
my original inspiration for converting the A700's
- had wondered about getting in touch with the
designers but thought i should come and meet
with the altec fans and consult.

very pleased to make your acquaintance -
what a fantastic looking beast the exemplar is,

cheers,

a

**Geekstar** · October 26th, 2012, 02:48 PM

Originally Posted by adam_ecofan

hi jeff,

- had wondered about getting in touch with the
designers but thought i should come and meet
with the altec fans and consult.

Yeah, forget the Exemplar designers...talk to Jeff instead of those jokers.

JR

**cradeldorf** · October 26th, 2012, 11:16 PM

Those Exemplars are pretty cool. Never heard of them before tonight.

**adam_ecofan** · October 27th, 2012, 02:26 PM

hi all,

glad there is atmosphere of bonhomie
round the forum - certainly better than
a hairsplitting contest...

news here: have to move the rig from
its warehouse lodging to a friends
double garage - turntables there though
- haven't treated them to vinyl yet so
something to look forward to,

warm regards,

a

**adam_ecofan** · October 29th, 2012, 03:54 PM

hi all,

rig in new location - will load pictures to my picasa page
and post link; my thread at audio heritage has pictures
of rapid prototyper output from the machine at tech -
pretty good resolution objects.

also, my source for the A700's had a rummage and has
turned up 299-8A's as an alternative to the 909's....

any thoughts?

warm regards,

a

**Earl K** · October 29th, 2012, 04:27 PM

Originally Posted by adam_ecofan

hi all,

<snip>

also, my source for the A700's had a rummage and has
turned up 299-8A's as an alternative to the 909's....

any thoughts?

warm regards,

a

Grab the 299s ( says a guy who loves the natural mid-range of the 288-8K ) .

FYI, with a change of diaphragms ( from GPA ), 299s become 288s .

>< EarlK

**adam_ecofan** · October 30th, 2012, 12:40 AM

Originally Posted by Earl K

Grab the 299s ( says a guy who loves the natural mid-range of the 288-8K ) .

FYI, with a change of diaphragms ( from GPA ), 299s become 288s .

>< EarlK

hi all,

thanks earl,

still coming to grips with the altec nomenclature - units in
question are 299-8A's and AT's. chap actually has 8 of them!

they've been in storage for a while and there is some
minor corrosion on the motor exterior - will grab a photo
next time i'm out his way.

cheers,

a

**adam_ecofan** · November 1st, 2012, 02:51 PM

hi all,

altec 299 photos at the audioheritage thread,
going back out to see if there are matching
woofers and horns hidden somewhere too,

more news as it happens,

a