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    Further Charge Coupling question: has anyone...

    Further Charge Coupling question: has anyone tried a mismatched series of caps to get a capacitance value in between standard values?

    I.E. on a tweeter 1uF is a standard, so in charge coupling we...
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    The 801A used an Altec 604 8G and had the...

    The 801A used an Altec 604 8G and had the original blue Urei radial horn, not the Mantaray.

    The mantaray horn was introduced on the 604 8K which was the platform for the 801AA, hence the tiny...
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    It's slightly confusing, but the original version...

    It's slightly confusing, but the original version of the Urei duplex was based on a 604 8G driver and was called an 801A. It was used in the 811, 813 & 815 monitors.

    The 811A, 813A and 815A...
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    I'm surprised no one here has any input. ...

    I'm surprised no one here has any input.

    Having these 801AA duplexes to study has raised more questions than they have answered.

    I can certainly clone this horn and mounting in my wood horns,...
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    Done, Thank you!

    Done, Thank you!
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    Updating profile issues

    The forum platform does not seem to be allowing me to update my signature line. That system is out-of-date and I'de like to revise it, but I can't seem to find a way to do that.

    Anyone have...
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    Altec 604 8G and 604 8K throat sizes.

    It's been a while since I've been here, but I need help from some of the brains here.

    For many years I've been playing with and building Urei 801B duplex drivers and custom horns. The parts are...
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    Thanks, that is implied, but why not just draw it...

    Thanks, that is implied, but why not just draw it into the schematic?

    So like this? Or doI just need one battery charging both the mid and high filters?
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    Old thread, but it seems like I could get the...

    Old thread, but it seems like I could get the answer here.

    All of the schematics I see show the point where the 9V is applied between the caps, but where does the other end of the battery land?
    ...
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    Ha! I just came across this photo linked in the...

    Ha! I just came across this photo linked in the Chilean Audio forum.

    I made the pair of Yuichi's with the Burgundy mouth stripe. Are those Ricks? I sold them on Ebay years ago as a part of some...
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    The C series is tricky because Harmon completely...

    The C series is tricky because Harmon completely redesigned the crossovers with the Tapped inductors making them very hard to replicate.

    To stay passive and time align might require modifying the...
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    I haven't posted here in ages. I built a new pair...

    I haven't posted here in ages. I built a new pair of 840 crossovers at the beginning of the year. The parts count is very high, and as a result the cost is too. But they were worth the effort. Prior...
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    If you look further in that sig line you'll...

    If you look further in that sig line you'll notice a 130 midbass horn. That is what I'm looking into a current production driver for. The horn design produces a very flat 65-500Hz bandwidth at about...
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    Current Production question

    Do any of you know if there is a current production JBL driver with specs matching or very close to a D-130?

    ThankS

    eso
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    Try the link now. For some reason it didn't post...

    Try the link now. For some reason it didn't post correctly the first time.

    eso
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    Here you go...

    https://dl.dropboxusercontent.com/u/4500648/Audio/811B crossover.pdf

    While it doesn't say so, this is the 830 crossover schematic which is the correct crossover for 1 801B duplex in an 811B...
  17. Thread: Altec 210

    by eso
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    The dimensions are there, and they accurately...

    The dimensions are there, and they accurately describe an exponential flare, not a radius. You will have to draw it up full size to make a pattern for the ribs that the skin is formed on anyway.
    ...
  18. Thread: 2425H suitability?

    by eso
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    While not really germane to where the thread has...

    While not really germane to where the thread has gone, the 2425 drivers where used with a PAS 15" to create the coax that was the core of the Urei "B" series studio monitors. So I'd say they can be...
  19. Thread: My DIY Altec 828

    by eso
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    I'm not sure the dimensions. I did these over 10...

    I'm not sure the dimensions. I did these over 10 years ago. I believe I sized them to 100 Sq. In. This is an A5 system: 515b, 288b, 1005A (tar-filled). The way I've current got them configured in my...
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    Not to get too specific, but the 801C 15" coax...

    Not to get too specific, but the 801C 15" coax was the heart of the 811C, 813C and 815C monitors which had a single coax, a coax plus a helper woofer, and a coax plus 2 helper woofers respectively.
    ...
  21. Thread: My DIY Altec 828

    by eso
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    Extensive bracing added to the inside of the...

    Extensive bracing added to the inside of the cabinet really helps to tighten up the bottom end, and properly damping the horn flares with improve the midbass clarity. I did both of those plus...
  22. Here's a copy of the schematic that also lists...

    Here's a copy of the schematic that also lists the wire color coding:

    https://dl.dropbox.com/u/4500648/Audio/n1201-8aRevsmall.jpg

    If you can't read that this link should give you a larger copy:...
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    If your 825/828 cabinets are properly braced and...

    If your 825/828 cabinets are properly braced and damped, you should have pretty good response down to 40-45Hz. 515s won't really get you any deeper unless you use a whole bunch of them. Since you...
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    It wouldn't be too difficult to laminate that...

    It wouldn't be too difficult to laminate that horn out of wood. Since it is black you can hide all manner of hackery under the paint.


    eso
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    825/828 cabinet tweaks...

    I've had my old A5s for over 10 years now and after many early attempts to improve them I realized they are at their best with just a few modifications to tighten up the cabinet.

    The components...
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