MITSUBISHI QUAD EIGHT 4-BAND EQ 82041 and Trident TSM EQs CB9132
Old 29th December 2012
  #1
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Thread Starter
Post MITSUBISHI QUAD EIGHT 4-BAND EQ 82041 and Trident TSM EQs CB9132

I bought some EQs low. Now I am looking for the schematics.
It is the MITSUBISHI QUAD EIGHT 4-BAND EQ 82041 and Trident TSM EQ CB9132.
Does anyone who has used ICs for Trident CB9132 EQ?
Old 30th December 2012
  #2
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saw those too. anxious to see you get them sussed out and working. hope you document your build here w/ pictures for the rest of us.
Old 22nd January 2013
  #3
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Quote:
Originally Posted by Andreas K View Post
I bought some EQs low. Now I am looking for the schematics.
It is the MITSUBISHI QUAD EIGHT 4-BAND EQ 82041 and Trident TSM EQ CB9132.
Does anyone who has used ICs for Trident CB9132 EQ?
I have the schematics for the CB9132, found them while looking for the line/mic module of the same console. PM me if you're still interested. I am still looking for the 82041 schematics though, any luck with these so far?
Old 29th January 2013
  #4
Gear interested
 

Hey, I just bought a pair of those eq's too. I googled around and found this...

We maintain a console master book from a Mitsubishi Filmstar console that has docs on the 3-Band Semi-Parametric eq. The pinout should be the same for all similar Mitsubishi era eqs, but without additional information I recommend checking everything twice......err,... or maybe three times.

Pin# / Signal
8b / -18vdc
9b / +18vdc
10b / Audio Common
11a/b / eq out
13a/b / eq in -
15a/b / eq in+

Probe the connector, check the pcb for correct components at each pin and be very careful before connecting power.

I haven't tried hooking mine up yet...did you ever get a hold of the actual schematics for the 82041?
Old 15th March 2013
  #5
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*BUMP*

Anyone found schematics/pinouts yet?

@Analog Al: Did you try the pinout of your post above? did it work?
Old 3rd April 2013
  #6
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Yes, it did work! Those are the correct pinouts.
Old 3rd April 2013
  #7
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Quote:
Originally Posted by Analog Al View Post
Yes, it did work! Those are the correct pinouts.
OK, thanks! Great timing, i'm about to finish my little DIY rack of console channel strips & modules this weekend and the quad eight EQs are part of it.
Old 2nd March 2015
  #8
Waking this thread up for future resource.

I bought four 82041 Westar EQ modules on eBay and racked them up successfully. The pinout above is correct. I have crude (photographed) schematics for these modules if anyone is on the hunt. The ebay seller will likely include them with the purchase - that's where I got them.

The only thing I added was a circuit to change the output from unbalanced to balanced using a THAT1646 IC. See the schematic attached. Also I found connectors that fit the modules headers. Also attached is my routing for the circuit, not very pretty, but works fine. I put a 47uF between the output of the card and the THAT1646 circuit to filter out potential DC. Also those two 10uF caps are Non-polarized.

Here's a link to buy them: 09222326825 HARTING | Mouser (I bent the pins over to make it 'right-angle mounted', which I couldn't find anywhere.

I found small 1" proto pcb's that fit the cards edge and have a span of 9 through-holes which is enough pins to catch the span of the pinout on the module (8-15): ProtoBoard - Square 1" Double Sided - PRT-08814 - Karlsson Robotics

Got my 2U case here: New 2U Rackmount Enclosure 37-2U - Electronic Enclosures | Circuit Specialists (And drilled the holes by hand. And cut rectangle holes for the modules in the front panel with a jigsaw.

I have one channel burning in right now. Seems good so far...
Attached Thumbnails
MITSUBISHI QUAD EIGHT 4-BAND EQ 82041 and Trident TSM EQs CB9132-11016679_10205955171382173_697624157_n.jpg   MITSUBISHI QUAD EIGHT 4-BAND EQ 82041 and Trident TSM EQs CB9132-photo-1.jpg   MITSUBISHI QUAD EIGHT 4-BAND EQ 82041 and Trident TSM EQs CB9132-photo-2.jpg   MITSUBISHI QUAD EIGHT 4-BAND EQ 82041 and Trident TSM EQs CB9132-photo-3.jpg   MITSUBISHI QUAD EIGHT 4-BAND EQ 82041 and Trident TSM EQs CB9132-photo-4.jpg  

MITSUBISHI QUAD EIGHT 4-BAND EQ 82041 and Trident TSM EQs CB9132-correct-that1646-circuiton1inch-mitseq.jpg   MITSUBISHI QUAD EIGHT 4-BAND EQ 82041 and Trident TSM EQs CB9132-that1646-fig5.png  

Last edited by Jim Keaney @ Devotion Recording; 2nd March 2015 at 04:48 PM..
Old 3rd June 2015
  #9
Here for the gear
 

Quote:
Originally Posted by Jim Keaney @ Devotion Recording View Post
Waking this thread up for future resource.

I bought four 82041 Westar EQ modules on eBay and racked them up successfully. The pinout above is correct. I have crude (photographed) schematics for these modules if anyone is on the hunt. The ebay seller will likely include them with the purchase - that's where I got them.

The only thing I added was a circuit to change the output from unbalanced to balanced using a THAT1646 IC. See the schematic attached. Also I found connectors that fit the modules headers. Also attached is my routing for the circuit, not very pretty, but works fine. I put a 47uF between the output of the card and the THAT1646 circuit to filter out potential DC. Also those two 10uF caps are Non-polarized.

Here's a link to buy them: 09222326825 HARTING | Mouser (I bent the pins over to make it 'right-angle mounted', which I couldn't find anywhere.

I found small 1" proto pcb's that fit the cards edge and have a span of 9 through-holes which is enough pins to catch the span of the pinout on the module (8-15): ProtoBoard - Square 1" Double Sided - PRT-08814 - Karlsson Robotics

Got my 2U case here: New 2U Rackmount Enclosure 37-2U - Electronic Enclosures | Circuit Specialists (And drilled the holes by hand. And cut rectangle holes for the modules in the front panel with a jigsaw.

I have one channel burning in right now. Seems good so far...
Excellent work Jim !!

Was thinking of getting a few myself.

Keep us updated on the results..
Old 4th June 2015
  #10
Quote:
Originally Posted by currentstatus View Post
Excellent work Jim !!

Was thinking of getting a few myself.

Keep us updated on the results..
They sound great and they're very usable. This project was about $600 total. $150 per EQ can't be beat.

The balancing circuit (THAT 1646) adds 6db of gain. These EQ's have about 22db of gain (fully boosted with a 1k sine tone), so with that added 6db, the curves would start to buckle and become distorted when fully boosted (according to a real-time analyzer plug). So when I fed it 6db less of the 1k tone, the curves looked nice and smooth. So I plan to add an L-pad (2 resistor network per channel) to pad them down 6db. L-pad will go after the module but before the THAT1646 circuit.

Here's an L-pad calculator for anyone looking to do something similar. L pad calculator - attenuation dB damping impedance decibel loudspeaker speaker voltage divider - sengpielaudio Sengpiel Berlin

I wish I had incorporated this L-pad into my proto-board wiring, but oh well... shouldn't be too hard to add it now.
Old 4th June 2015
  #11
Here for the gear
 

Quote:
Originally Posted by Jim Keaney @ Devotion Recording View Post
They sound great and they're very usable. This project was about $600 total. $150 per EQ can't be beat.

The balancing circuit (THAT 1646) adds 6db of gain. These EQ's have about 22db of gain (fully boosted with a 1k sine tone), so with that added 6db, the curves would start to buckle and become distorted when fully boosted (according to a real-time analyzer plug). So when I fed it 6db less of the 1k tone, the curves looked nice and smooth. So I plan to add an L-pad (2 resistor network per channel) to pad them down 6db. L-pad will go after the module but before the THAT1646 circuit.

Here's an L-pad calculator for anyone looking to do something similar. L pad calculator - attenuation dB damping impedance decibel loudspeaker speaker voltage divider - sengpielaudio Sengpiel Berlin

I wish I had incorporated this L-pad into my proto-board wiring, but oh well... shouldn't be too hard to add it now.
Great news! (and thanks for the L-pad link)

I've been looking to get a Quad Eight parametric for a while so I may pick up a couple now on ebay. Which is better choice.. EQ 82041 or EQ 82011

I also just noticed these kits today.. for future ref:
Balanced Output Building Block – DIYRE
Old 4th June 2015
  #12
Quote:
Originally Posted by currentstatus View Post
Great news! (and thanks for the L-pad link)

I've been looking to get a Quad Eight parametric for a while so I may pick up a couple now on ebay. Which is better choice.. EQ 82041 or EQ 82011

I also just noticed these kits today.. for future ref:
Balanced Output Building Block – DIYRE
Oh yeah, I discovered those DIYre kits like the day after I ordered all the parts! Oh well... I learned something, I'm sure.

82041 is the model I used. Personally, I don't know the difference between those and the 11's.

This is the auction I purchased my 4 from: Quad Eight Westar EQ Module s Parametric Equalizer Mitsubishi Era SSL | eBay

They were in pretty similar shape, 3 were dated 1989 and 1 was 1988 I think... so you might want to contact him and ask for the best match he can come up with.
Old 4th June 2015
  #13
Here for the gear
 

Quote:
Originally Posted by Jim Keaney @ Devotion Recording View Post
Oh yeah, I discovered those DIYre kits like the day after I ordered all the parts! Oh well... I learned something, I'm sure.

82041 is the model I used. Personally, I don't know the difference between those and the 11's.

This is the auction I purchased my 4 from: Quad Eight Westar EQ Module s Parametric Equalizer Mitsubishi Era SSL | eBay

They were in pretty similar shape, 3 were dated 1989 and 1 was 1988 I think... so you might want to contact him and ask for the best match he can come up with.

Just got 2x EQ82041's from evilbay UK.. must stop buying stuff (post-it note

I'm in Spain here so the US import duty is expensive and inevitable, Spanish customs don't miss a thing. So I tend to buy within the EU.

Anyway.. I'll get more info on the 82011's but I think they may be earlier models.

Headsup.. looks like FiveFish have balanced kits too:
FAB3346 - Unbalanced to Balanced Driver Module

Glad to see yours are up and running.. they look very good Jim!
Old 4th June 2015
  #14
Quote:
Originally Posted by currentstatus View Post
Just got 2x EQ82041's from evilbay UK.. must stop buying stuff (post-it note

I'm in Spain here so the US import duty is expensive and inevitable, Spanish customs don't miss a thing. So I tend to buy within the EU.

Anyway.. I'll get more info on the 82011's but I think they may be earlier models.

Headsup.. looks like FiveFish have balanced kits too:
FAB3346 - Unbalanced to Balanced Driver Module

Glad to see yours are up and running.. they look very good Jim!
Cool! let me know if you get stuck on anything.
Old 29th June 2015
  #15
Here for the gear
 

Here are my Mitsubishi Quad Eight EQ’s. I am very pleased with how these sound. Maybe a little overkill but I wanted them in a portable rack so I made a backplane to keep the cards supported. All of the enclosure and internal plates are made of 1/8” aluminum fabricated from scratch using only woodworking tools. I picked up the aluminum sheet from the scrap bin of a local aluminum fabricating company for a very reasonable price. The angled aluminum is 3/4” x 3/4” from Home Depot. The fasteners are stainless steel. The xlr holes were made with a Greenlee 15/16” punch. The xlr connectors and labels are from Redco Audio. The cards can be removed from the front if they need servicing. Jim Keaney gave me some measurements and the connector information before I even received these EQ’s. I used a Fivefish Audio PSU-2448 power supply and transformer kit. There is no hum at all. I also used Fivefish Audio’s FABModules FAB3346 Unbalanced to Balanced Line Driver Modules. Because the FAB3346’s add 6dB I made a couple of -6dB H-Pads. I had originally tried to use Molex connectors on the 16 pin EQ connector but that was very unreliable so I removed pins 8 to 15 on the “a” side of the connector (not used) and soldered 2 Phoenix 8 pin terminal blocks to a small piece of strip board. The screw fasteners of the Phoenix terminal blocks hold very tightly on the connector pins. This also allowed for very easy connection of the input, output and power supply wires. I used drawer pulls on the front of the enclosure and I can stand the unit on its face without the knobs touching anything. The rear is inset for the same reason. If internal servicing is required, the four screws on each of the side panels can be removed and the panels can slide out to the front or rear.

I am not allowed to use <img> tags yet

https://www.gearslutz.com/board/memb...front-face.jpg

https://www.gearslutz.com/board/memb...-rear-face.jpg

https://www.gearslutz.com/board/memb...-hand-side.jpg

https://www.gearslutz.com/board/memb...-hand-side.jpg

https://www.gearslutz.com/board/memb...-backplane.jpg

https://www.gearslutz.com/board/memb...-connector.jpg

https://www.gearslutz.com/board/memb...-6db-h-pad.jpg

Last edited by Youngwhisk; 29th June 2015 at 04:44 AM..
Old 3 Weeks Ago
  #16
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Quote:
Originally Posted by Youngwhisk View Post
Here are my Mitsubishi Quad Eight EQ’s. I am very pleased with how these sound. Maybe a little overkill but I wanted them in a portable rack so I made a backplane to keep the cards supported. All of the enclosure and internal plates are made of 1/8” aluminum fabricated from scratch using only woodworking tools. I picked up the aluminum sheet from the scrap bin of a local aluminum fabricating company for a very reasonable price. The angled aluminum is 3/4” x 3/4” from Home Depot. The fasteners are stainless steel. The xlr holes were made with a Greenlee 15/16” punch. The xlr connectors and labels are from Redco Audio. The cards can be removed from the front if they need servicing. Jim Keaney gave me some measurements and the connector information before I even received these EQ’s. I used a Fivefish Audio PSU-2448 power supply and transformer kit. There is no hum at all. I also used Fivefish Audio’s FABModules FAB3346 Unbalanced to Balanced Line Driver Modules. Because the FAB3346’s add 6dB I made a couple of -6dB H-Pads. I had originally tried to use Molex connectors on the 16 pin EQ connector but that was very unreliable so I removed pins 8 to 15 on the “a” side of the connector (not used) and soldered 2 Phoenix 8 pin terminal blocks to a small piece of strip board. The screw fasteners of the Phoenix terminal blocks hold very tightly on the connector pins. This also allowed for very easy connection of the input, output and power supply wires. I used drawer pulls on the front of the enclosure and I can stand the unit on its face without the knobs touching anything. The rear is inset for the same reason. If internal servicing is required, the four screws on each of the side panels can be removed and the panels can slide out to the front or rear.

Wow! Built like a tank.. very cool.. and great work.

I still haven't had time to rack mine just yet.. I'll get around to it real soon and post them up.

I'm toying with using Lundahl output transformers on mine.. if I can get some reasonably priced.

So the inputs you guys are leaving unbalanced.. your just balancing the outputs yes?
Old 3 Weeks Ago
  #17
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Thanks,

Just hook them up with the pinout as above:
Pin# / Signal
8b / -18vdc
9b / +18vdc
10b / Audio Common
11a/b / eq out
13a/b / eq in -
15a/b / eq in+

Input is balanced. Output is unbalanced. Using a THAT 1646 unbalanced to balanced circuit adds 6dB. That is why Jim and I both used pads going to balanced outputs.
Make sure you also put 0v to pin 10b. That is not clearly mentioned above. Check the schematics if you have them. They are in several .jpg's. Can't read the full page schematic but the close ups are clear enough.

Pins 11a, 13a and 15a are already connected to their "b" counterpart on the circuit board so you don't have to worry about that on the connector. Just connect to the "b" pins for everything.
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