N-500-D crossover

[u1tramax94]

I want to recap my crossover.. but opened it up and it's full of like a rubbery substance... I and I take it the caps are in that box? How do I get to them?... Oh and anyone reconize these speakers??

[Mr. Widget]

Welcome to the forum, if you can grab a shot of model numbers on the woofers and the compression drivers, that would help identify the system. If you are asking what the model of the cabinet is, I don’t think it was built by Altec. A shot of the front would be helpful.

There is a thread on the forum where someone heated their vintage Altec networks to clear out the goop and free the components.

Hopefully one of our forum members who is more knowledgeable about Altecs will chime in.


Widget

[u1tramax94]

Had a heck of a time last night trying to upload them from my phone..

[u1tramax94]

Here goes nothing... They were recovered in 1970.. the woofers are 803a and horns are 802d.. crossovers a n-500-d

[u1tramax94]

Hmmmm. Nothing?

[JeffW]

Here's a thread with some cabs with a similar load. Zilch said he melted the tar out of a similar crossover with a heatgun, said it took about an hour per and he wouldn't do it again.

http://www.audioheritage.org/vbulletin/showthread.php?40677-Altec-Lansing-ID-802D-803B

[grumpy]

511 horn maybe? 802d being just the compression driver. Fun/efficient setup for a lowish-powered tube amp.

http://alteclansingunofficial.nlenet.net/proloudspeakers/sectoralhorns/511B&811B-Data.pdf
(pdf is a newer version of the 811/511 document, but dimensions might help if not obviously marked)

[Earl K]

Ultramax,

If your intent is to flip the speakers ( resell > move them on ), then I would advise you to just leave the networks as is ( recapping will lower their value ).

OTOH, if you intend to use them long term, then I would simply build new networks.

I'll post related schematics for the next version of that network shortly.

You can use that schematic as a template to move forward.

:)

http://www.audioheritage.org/photopost/data//500/Altec_N500-E.jpg


BTW; the original caps ( from this vintage ) are typically Motor-Runs PIO ( with the oil likely being PCB based )

http://www.audioheritage.org/photopost/data//500/Altec_N500C_inside_B1.jpg

Here's the inside of a N500-C.

Notice that the value of both caps is 18.9 uF ( mfd ).

You have the option of using either value . If you use 4uF ( as seen in the later model ) then you end up building in quite a bit of response flattening to the horns lower mid-range ( reducing horn shout or horn honk ).

[u1tramax94]

Ultramax,

If your intent is to flip the speakers ( resell > move them on ), then I would advise you to just leave the networks as is ( recapping will lower their value ).

OTOH, if you intend to use them long term, then I would simply build new networks.

I'll post related schematics for the next version of that network shortly.

You can use that schematic as a template to move forward.

:)

http://www.audioheritage.org/photopost/data//500/Altec_N500-E.jpg


BTW; the original caps ( from this vintage ) are typically Motor-Runs PIO ( with the oil likely being PCB based )

http://www.audioheritage.org/photopost/data//500/Altec_N500C_inside_B1.jpg

Here's the inside of a N500-C.

Notice that the value of both caps is 18.9 uF ( mfd ).

You have the option of using either value . If you use 4uF ( as seen in the later model ) then you end up building in quite a bit of response flattening to the horns lower mid-range ( reducing horn shout or horn honk ).

Well ty.. you kinda answered my next question.... Why recap them.. believe me I've heard it ALOT... I'm running them right now as I type.. they sound amazing.. I understand the flatting the horn..but I can do that with my eq?