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Quad VCA/panner; Blacet; racks

Quad VCA/panner; Blacet; racks

1999-07-21 by Christopher Jeris

Not to mention other modulars _too_ many times in one message, but ...

(1) Modcan has two different quad VCA modules, 09A with two CV inputs and
mixed outs 1&2, 3&4, and all, 11A "panner" with single CV inputs plus CV
for gain and pan on each pair and the group. It's not totally obvious to
me from the panel how the panner module works. I would like a multiple
VCA that can be either AC or DC coupled like the 09A (can the 110 be used
for DC? I forget - haven't tried because I don't have that many modules
yet). Maybe a 1U outboard panner/crossfader next to it?

(2) I just built and highly recommend the Blacet 2020 Frequency Divider.
It is a nice complement to the MOTM-120. The FD has a mix out with /1,
/1.5, /2, /3, adding a lot of harmonic color with the sub-fifths, and a
binary divide-down out switchable from /2^1 to /2^12 for sequencing.
(Unfortunately they share a single input.) A dip switch on the board adds
a simple internal RC filter to take a bit of the harshness off the square
waves. The FD doesn't have the "growling industrial monster" qualities of
the 120; instead I think it is more straightforwardly musical. Of course
Blacet's modules are not tanks like Paul's (I am glad the 3U fracrak is
enclosed!) but soundwise I think it holds its own quite well in a MOTM
system. (I guess it doesn't hurt to be driving it with a MOTM VCO. :))

Sadly it is only available assembled. John Blacet did a one-time run of
this module as kits for $85, but he shipped them all in a batch after the
closing date, so I couldn't review it until the kit was no longer
available!

(3) ObMotm: Does anybody have their MOTM in an "open relay rack" such as
Newark sells for about $130 -- one of those floor-to-ceiling 45U aluminum
rectangles? How does it feel? Do you worry about the thing tipping over?
I have a 20U black Quik Lok frame with the bottom 10U tilted, but it's
going to fill up sooner or later :)

peace,

Chris

Re: Quad VCA/panner; Blacet; racks

1999-07-21 by Mark Pulver

Christopher Jeris (01:03 PM 07/21/1999) wrote:

>(3) ObMotm: Does anybody have their MOTM in an "open relay rack" such as
>Newark sells for about $130 -- one of those floor-to-ceiling 45U aluminum
>rectangles? How does it feel? Do you worry about the thing tipping over?
>I have a 20U black Quik Lok frame with the bottom 10U tilted, but it's
>going to fill up sooner or later :)

The tall relay racks are usually bolted to the floor...

We live for hem here at work, and I have had them installed at home in past
gear configurations. :)

The phrase of the day is "Power Hammer" for concrete.. :)


Mark

Re: Quad VCA/panner; Blacet; racks

1999-07-21 by Paul Schreiber

I agree. Usually, the bottom 12U holds a 400lb power supply! Not MOTM-happy.

Paul S.

-----Original Message-----
From: Mark Pulver <mpulver@...>
To: motm@onelist.com <motm@onelist.com>
Date: Wednesday, July 21, 1999 12:09 PM
Subject: Re: [motm] Quad VCA/panner; Blacet; racks


>From: Mark Pulver <mpulver@...>
>
>Christopher Jeris (01:03 PM 07/21/1999) wrote:
>
> >(3) ObMotm: Does anybody have their MOTM in an "open relay rack" such as
> >Newark sells for about $130 -- one of those floor-to-ceiling 45U aluminum
> >rectangles? How does it feel? Do you worry about the thing tipping
over?
> >I have a 20U black Quik Lok frame with the bottom 10U tilted, but it's
> >going to fill up sooner or later :)
>
>The tall relay racks are usually bolted to the floor...
>
>We live for hem here at work, and I have had them installed at home in past
>gear configurations. :)
>
>The phrase of the day is "Power Hammer" for concrete.. :)
>
>
>Mark
>
>
>--------------------------- ONElist Sponsor ----------------------------
>
>Congratulations SAYNO2DRUGS. Our latest ONElist of the week.
>http://www.onelist.com
>How is ONElist changing YOUR life? Visit our homepage and let us know!
>
>------------------------------------------------------------------------
>

Re: Quad VCA/panner; Blacet; racks

1999-07-21 by Cary Roberts

>(3) ObMotm: Does anybody have their MOTM in an "open relay rack" such as
>Newark sells for about $130 -- one of those floor-to-ceiling 45U aluminum
>rectangles? How does it feel? Do you worry about the thing tipping over?
>I have a 20U black Quik Lok frame with the bottom 10U tilted, but it's
>going to fill up sooner or later :)

You can get a nice grey powdercoat B-Line 7' relay rack for $100 or
so from Graybar. These are designed to be bolted to the floor and
top supported. I would not recommend using them without proper support.
You could have someone weld 1/2" threaded rod studs to a 24"x24" 8guage
steel plate and use that for a base. Several companies make "unequal
flange" relay racks, which are deeper than normal, which would facilitate
bolting lexan or plexiglass directly to the rear of the rack as a cover.
The cheapest way to get a relay rack is to check the dumpsters at a Bell or
MCI site every once in a while. We usually dump them when we decomm
them. Unfortunately (or fortunately) Bell usually leaves the junk
equipment in them when they throw them out. (usually old toll cross
bar switchers, junk SLC96 frames, 1A switches, etc.

WARNING: The last Bell racks I saw were 14' tall. Bring a big van!

-Cary

Re: Quad VCA/panner; Blacet; racks

1999-07-21 by james holloway

At work We use large steel feet that mount perpendicular to the rack frame.
This configuration allows one to push the rack easily if it is set on a
concrete floor. probably wouldn't work on carpet or vinyl floor covering.
Jim


>From: Mark Pulver <mpulver@...>
>Reply-To: motm@onelist.com
>To: motm@onelist.com
>Subject: Re: [motm] Quad VCA/panner; Blacet; racks
>Date: Wed, 21 Jul 1999 12:09:30 -0500
>
>From: Mark Pulver <mpulver@...>
>
>Christopher Jeris (01:03 PM 07/21/1999) wrote:
>
> >(3) ObMotm: Does anybody have their MOTM in an "open relay rack" such as
> >Newark sells for about $130 -- one of those floor-to-ceiling 45U aluminum
> >rectangles? How does it feel? Do you worry about the thing tipping
>over?
> >I have a 20U black Quik Lok frame with the bottom 10U tilted, but it's
> >going to fill up sooner or later :)
>
>The tall relay racks are usually bolted to the floor...
>
>We live for hem here at work, and I have had them installed at home in past
>gear configurations. :)
>
>The phrase of the day is "Power Hammer" for concrete.. :)
>
>
>Mark
>
>
>--------------------------- ONElist Sponsor ----------------------------
>
>Congratulations SAYNO2DRUGS. Our latest ONElist of the week.
>http://www.onelist.com
>How is ONElist changing YOUR life? Visit our homepage and let us know!
>
>------------------------------------------------------------------------

Re: Quad VCA/panner; Blacet; racks

1999-07-21 by Christopher Jeris

Paul> I agree. Usually, the bottom 12U holds a 400lb power supply! Not
Paul> MOTM-happy.

Mark> The tall relay racks are usually bolted to the floor...

Hm. I can't bolt things to the floor in my apartment (never mind that the
building is so far below code, bolting anything to a floor beam would
probably crack it). But the picture of a relay rack in the Newark catalog
shows base flanges extending a little ways front and back from the bottom
of the rails, I guess to put bolts into. You think I could maybe hold it
down with a few 15kg lead bricks? If you normally bolt those flanges
down, they must be strong enough that the thing doesn't bend and fall over
to front or back when you put equipment in it, right? So maybe (since
MOTMs are really pretty light) it would be enough just to weight the base
down instead.

in love with lead bricks,

Chris

Re: Quad VCA/panner; Blacet; racks

1999-07-21 by Mark Pulver

Christopher Jeris (01:49 PM 07/21/1999) wrote:

>Paul> I agree. Usually, the bottom 12U holds a 400lb power supply! Not
>Paul> MOTM-happy.
>
>Mark> The tall relay racks are usually bolted to the floor...
>
>Hm. I can't bolt things to the floor in my apartment (never mind that the
>building is so far below code, bolting anything to a floor beam would
>probably crack it). But the picture of a relay rack in the Newark catalog
>shows base flanges extending a little ways front and back from the bottom
>of the rails, I guess to put bolts into. You think I could maybe hold it
>down with a few 15kg lead bricks? If you normally bolt those flanges
>down, they must be strong enough that the thing doesn't bend and fall over
>to front or back when you put equipment in it, right? So maybe (since
>MOTMs are really pretty light) it would be enough just to weight the base
>down instead.

Yes, you can weight them down, but at 15kg a pop, you're gonna need a few
bricks.

There's some physics involved here that I don't know the math for, but
basically, it will take a lot less weight than you may think at the top of
the rack to topple the whole thing. You have to get a good amount of weight
at the bottom to stop it from happening.

The flanges at the bottom are quite strong... Double welds, heavy gauge
steel and all that. Just load 'em up with weight and make sure that the
weight doesn't have a way to shift off of the legs.

To help this, try bolting the bottom of the rack to a piece of 3/4"
plywood, and then stacking the weight onto the wood. That'll give you more
surface area to put weight on.


Something else...

Most racks I've seen do NOT ship broken down. If you're in an apartment,
you might wanna think about just how you're gonna get the rack up any
stairs and in place. Also, shipping costs can be quite high.


Mark

Re: Quad VCA/panner; Blacet; racks

1999-07-21 by Cary Roberts

>There's some physics involved here that I don't know the math for, but
>basically, it will take a lot less weight than you may think at the top of
>the rack to topple the whole thing. You have to get a good amount of weight
>at the bottom to stop it from happening.

ABSOLUTELY TRUE!!!!

>Most racks I've seen do NOT ship broken down. If you're in an apartment,
>you might wanna think about just how you're gonna get the rack up any
>stairs and in place. Also, shipping costs can be quite high.

The good racks from B-Line and Newton do break down. Get the real
thing, they're cheaper and better than the Mid-Atlantic and IT wanna-be's.

www.b-line.com
www.graybar.com

-Cary

Re: Quad VCA/panner; Blacet; racks

1999-07-21 by J. Larry Hendry

> Several companies make "unequal
> flange" relay racks, which are deeper than normal, which would facilitate
> bolting lexan or plexiglass directly to the rear of the rack as a cover.

Oh, too cool. I never thought about a clear cover on the back of mine so
you could see the backs of the modules. Great idea Cary.

> The cheapest way to get a relay rack is to check the dumpsters at a Bell
or
> MCI site every once in a while. We usually dump them when we decomm
> them.

This is exactly the way I got most of the racks in my studio. We thow them
out where I work too (electric utility). We use lots of them like the
phone company does. I guess they figure its cheaper to toss the whole
thing that to pay IBEW labor rates for someone to strip all the old gear
off them.

> Unfortunately (or fortunately) Bell usually leaves the junk
> equipment in them when they throw them out. (usually old toll cross
> bar switchers, junk SLC96 frames, 1A switches, etc.

Ditto, different stuff, same reason.

Larry Hendry