NewYorkDave

Another famous passive EQ
« on: January 03, 2005, 08:20:37 PM »
I thought I'd do one more before I turn off the scanner for the night.

Here's a 1950 article by Cinema Engineering president, Art Davis, that includes info on the classic 4031-B equalizer made by his company.

1.5Meg PDF


Mark Burnley

Another famous passive EQ
« Reply #1 on: January 03, 2005, 08:26:12 PM »
Ooh ooh..

..is this the groovy looking one in Cyclopedia?

I think they've got a few at Toe Rag studios in London.

Downloading now...thanks for the scans!

 :thumb:

(BTW, check your mail Dave!)

Mark
O_O tape is life O_O

NewYorkDave

Another famous passive EQ
« Reply #2 on: January 03, 2005, 09:12:21 PM »
Quote from: "Mark Burnley"

..is this the groovy looking one in Cyclopedia?


The very same.

Quote
I think they've got a few at Toe Rag studios in London.


That's what I've heard.

Quote
(BTW, check your mail Dave!)


"Package" received in good condition. Thanks! I've already shared it with the group.  :green:

Another famous passive EQ
« Reply #3 on: January 04, 2005, 03:00:37 AM »
You're really giving today Dave, go man, go!   Der skeemos out der in www land somesplace?  Thanks for that cool mixer dope too.
"The pen is mightier than a flamin' bag of poop."  --Dr. Bartholomew Simpson

gyraf

Another famous passive EQ
« Reply #4 on: January 04, 2005, 05:56:35 AM »
:shock:  Thanks..!!!!!

Jakob E.
..note to self: don't let Harman run your company..

NewYorkDave

Another famous passive EQ
« Reply #5 on: January 04, 2005, 01:01:14 PM »
I haven't found any schematics of the 4031-B, but the Langevin EQ251-A (which was reverse-engineered by my friend Rick, and can be found on Gyraf's site) is nearly the same circuit according to most reports. It's been claimed that Art Davis was involved in the design of the Langevin EQ as well.

Shameless plug: the NYD EQ can give you the same curves with much less circuit complexity, albeit with nonconstant input/output impedances.

gyraf

Re: Another famous passive EQ
« Reply #6 on: July 13, 2016, 08:02:21 AM »
Did anyone ever find reliable schematics for the Cinema engineering 4031-B EQ?

Jakob E.
..note to self: don't let Harman run your company..

EmRR

Re: Another famous passive EQ
« Reply #7 on: July 13, 2016, 08:14:36 AM »
I re-engineered a pair of Hycor variant from 2dB steps to 1dB steps for a mastering house, comparing to the 251 was adequate. 
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounde

gyraf

Re: Another famous passive EQ
« Reply #8 on: July 13, 2016, 08:37:29 AM »
So you would say that the 4031-B is more or less a Langevin 251?

Jakob E.
..note to self: don't let Harman run your company..

EmRR

Re: Another famous passive EQ
« Reply #9 on: July 13, 2016, 08:56:36 AM »
Yes, outside of small tweaks.  All evidence still suggests Art Davis or his team designed them all.  Cinema, Langevin, Hycor, Altec. 
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounde


ruffrecords

Re: Another famous passive EQ
« Reply #10 on: July 13, 2016, 09:37:09 AM »
Anyone have a copy of the pdf? The link is broken.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

mjrippe

Re: Another famous passive EQ
« Reply #11 on: July 13, 2016, 01:07:20 PM »
Anyone have a copy of the pdf? The link is broken.

Cheers

Ian

Just added to the Technical Documents section.  http://groupdiy.com/index.php?topic=63274.0


 

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