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<font size="2" face="Verdana, Helvetica, sans-serif">- Jensen never made a woofer that looked anything like what you've shown .Quote:
So the thought is that the woofers might be Jensen rather than Altec? Is there any way to tell for sure?
Thanks,
Allan
- The following pic of yours clearly shows an old 515b type woofer .
- The 288s, appear to be the 288b model .
- BTW, nice acquisition .
http://www.hostboard.com/forums/hbmc.../2008/04/4.jpg
Thank you Sir. I have looked closely at the woofers, and they have paper surrounds. Is this not the original 515 woofer? Don't mind the footyprints. Glad there was nothing edible on these....
http://audiokarma.org/forums/attachm...8&d=1207186826
IPC sourced from a number of companies- generally with VOT stickers they are Altec loaded- I was referencing a different cabinet.
A note though- those appear to be 288-B's.
Please excuse the shout here- this is important.
I THINK THE 288-B HAS TO BE MACHINED TO ACCEPT NEW DIAPHRAGMS. CONTACT GPA BEFORE ATTEMPTING REPLACEMENT!
The available replacements drop in from "C" models up, not the "B" model.
I am 99% sure it is not a drop in operation.
I do think, BTW, those are original 515's, not B's. Look for numbers on them and post, we'll sort out the dates.
Hmm, at least some of these Simplex FLH systems were made by Altec (Altec had a long history of being an equal opportunity provider), though considering that all I've ever seen 'in the flesh' and ebay, etc., pics were Altec loaded/labeled implies they were the only vendor or at least made by one of the many local shops to Altec specs.
Yes, one piece cones are the original 515 (no suffix) drivers. Very rare since most have been re-coned and the 'surrounds' are probably quite fragile/prone to cracking by now.
GM
The Film-Tech manual library contains a Simplex manual for the XL systems. Not much about your components, mainly on the soundhead, amps, changeover, etc. There's also a bit on Simplex history. Just something you might find interesting.
I guess I'll have to go easy on the woofers, since I have a couple of small cracks in 1 out of 4 that I have carefully examined so far. A note from Bill at GPA follows regarding recones:
Hello,
We do not recone the full paper 515's any longer but we can recone your speaker with the 515B kit the cost is $117.70 each, we also have the diaphragms the cost is $100.00 each.
Looking at the pictures I do not think I would recone the 515's I think you could brush on some adhesive from the back side and they would be fine. You could use some Elmer's glue ( may be thin it with a little water).
Best Regards,
Bill Hanuschak
I think we are of the same mind in that I want to try and keep these as original as possible. So far I have only put 10-12 watts through them, but obviously the woofers bear watching. One of the 288B's is distorting and I have been told that it is quite possible this is due to dirt and grunge inside the gap or against the diaphragm. I would like to clean this out, but am apprehensive in that I don't want to hurt anything.
Before I forget, is there anything that can be done to try and....preserve the paper cone/surround woofers? I suppose anything that adds mass would screw with all sorts of sonic properties, so that is probably out of the question. Ideas?
Thanks,
Allan
<font size="2" face="Verdana, Helvetica, sans-serif">Wow, break any windows? That would be some serious SPL's.Quote:
Originally posted by analog addict:
So far I have only put 10-12 watts through them, but obviously the woofers bear watching.
Dave
Heh,
I found the volume a bit much at 50 feet down the driveway, but from the middle of the street about 100 feet away, it sounded great! http://www.hostboard.com/forums/ And that was tube power too...
Unless the cones proper show obvious deterioration or defects, they shouldn't need any additional protection other than to dye them if unevenly faded or just want to make them look fresh from the mold again.
As BH noted, thinned Elmer's glue on the back side of the surrounds will help without adding enough mass to matter, though I'm surprised he didn't suggest the black goop used on the formed surrounds of inexpensive PA drivers, though might want to get his thoughts on it.
Note that if your amp has a high output impedance it will interact with the horn's high impedance such that its 12 W can be more like a 2 - 4x more powerful SS amp depending on frequency.
GM
<font color="#FFFFFF" size="1">[ April 03, 2008 03:59 PM: Message edited by: GM ]</font>