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Just bought an MCI 416b for $800.
Old 25th February 2009 | Show parent
  #91
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rob S's Avatar
 
🎧 10 years
are A and B modules interchangeable in a B frame?
Old 25th February 2009 | Show parent
  #92
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Quint's Avatar
 
1 Review written
🎧 10 years
Quote:
Originally Posted by rob S ➑️
are A and B modules interchangeable in a B frame?
I don't know but I'd like to find out.
Old 27th February 2009 | Show parent
  #93
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rob S's Avatar
 
🎧 10 years
that makes two of us
Old 27th February 2009 | Show parent
  #94
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analogtodd's Avatar
 
🎧 10 years
I know you can put 428a modules in a 428b frame.
The goesinta and goesoutta stuff is the same on the modules.
Old 28th February 2009 | Show parent
  #95
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Quint's Avatar
 
1 Review written
🎧 10 years
So what temperature are you guys soldering at? Any particular type/brand of solder I should use? What about the wires I need to buy that are going to go between the PSU's and the console?
Old 1st March 2009 | Show parent
  #96
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🎧 10 years
Alright, I've started to wire up my power supplies. I'm looking at the schematic and it shoes six connections, 24 + and -, ground zero volt, earth ground, and + and - auto volt trim. Well my power strip only has +/- 24 , 0 volt, and power sense res.

So what corresponds to what here? 24 +/- and 0 volt matches obviously, but what is my power sense res.?

By the way, I'm using 14 gauge wire to get between the psu's and the console. Not that it matters for this question.
Old 1st March 2009 | Show parent
  #97
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Quint's Avatar
 
1 Review written
🎧 10 years
Anybody know which pin on the Cinch Jones connector corresponds to the power sense connection in the back of a 416b?
Old 2nd March 2009 | Show parent
  #98
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analogtodd's Avatar
 
🎧 10 years
The +24 is carried on pins 1&2
the -24 is carried on pins 16&17

+trim is carried on pin 7
-trim is carried on pin 8

Audio ground is pins 10&11

"earth" is carried pins 13&14

ALL 3 power supplies are the same audio, relays, lamps

This is cool, because if you lost one power supply for whatever reason, you could still do a session without lamps (if you had to)

See attached pdf's for notes about trimming down to 22v or tying ground to earth.


If ANYBODY has ever seen anything different on a 400 power supply, post it here. Obviously, a different power supply would be required for the light meter bridge.
Attached Files
File Type: pdf MCI_JH400B_Power_Supply.pdf (213.4 KB, 187 views) File Type: pdf MCI_JH400B_Power_Supply_2.pdf (162.0 KB, 177 views)
Old 2nd March 2009 | Show parent
  #99
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analogtodd's Avatar
 
🎧 10 years
And RECAP the power supplies!!! Everybody always stresses the little caps in your channel strips, but those BIG badboy caps in your power supplies are 35-ish years old too, and they need to go!!!
Old 2nd March 2009 | Show parent
  #100
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Quint's Avatar
 
1 Review written
🎧 10 years
Quote:
Originally Posted by monkeyt ➑️
And RECAP the power supplies!!! Everybody always stresses the little caps in your channel strips, but those BIG badboy caps in your power supplies are 35-ish years old too, and they need to go!!!
Yeah, those caps are HUGE. Where's a good place to get those? Any recommendations on brand/type?
Old 2nd March 2009 | Show parent
  #101
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Quint's Avatar
 
1 Review written
🎧 10 years
Quote:
Originally Posted by monkeyt ➑️
The +24 is carried on pins 1&2
the -24 is carried on pins 16&17

+trim is carried on pin 7
-trim is carried on pin 8

Audio ground is pins 10&11

"earth" is carried pins 13&14

ALL 3 power supplies are the same audio, relays, lamps

This is cool, because if you lost one power supply for whatever reason, you could still do a session without lamps (if you had to)

See attached pdf's for notes about trimming down to 22v or tying ground to earth.


If ANYBODY has ever seen anything different on a 400 power supply, post it here. Obviously, a different power supply would be required for the light meter bridge.
Still unsure about the power sense connections though.
Old 2nd March 2009 | Show parent
  #102
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analogtodd's Avatar
 
🎧 10 years
If you are really unsure about it, tie a 10ohm resistor between the +24 and pin7 and the -24 to pin 8

If you are using 10ft of 14ga connecting wire, you'll be fine.

You really need to verify that the regulators are doing what they should be doing before plugging anything into the console though.
Old 2nd March 2009 | Show parent
  #103
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analogtodd's Avatar
 
🎧 10 years
Quote:
Originally Posted by Quint ➑️
Yeah, those caps are HUGE. Where's a good place to get those? Any recommendations on brand/type?
Take measurements and make sure you get something that'll fit!!!
Old 4th March 2009 | Show parent
  #104
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Quint's Avatar
 
1 Review written
🎧 10 years
Quote:
Originally Posted by monkeyt ➑️
Yeah

Check this out for more buffer info...
VU Buffer kit page

Hey this is good info!!! Next time someone buys an MCI this will be a resource!
I finally went and checked out these buffer kits. These look like they could really work, but does anybody know of any other options to get my meters buffered? There may not be but just curious.
Old 4th March 2009 | Show parent
  #105
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analogtodd's Avatar
 
🎧 10 years
Nice for DIY, VU Meter Buffer Board Sony MCI JH-24 JH24 - eBay (item 320280274080 end time Mar-25-09 19:39:35 PDT)


VU Meter buffer amplifier printed circuit board PCB - eBay (item 130271665364 end time Mar-25-09 15:31:29 PDT)

Its really stupid simple buffer circuit....

The amount of distortion that the meter is bringing in is pretty minimal. I'd worry about other things before tackling this.
Old 4th March 2009 | Show parent
  #106
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Quint's Avatar
 
1 Review written
🎧 10 years
Quote:
Originally Posted by monkeyt ➑️
Nice for DIY, VU Meter Buffer Board Sony MCI JH-24 JH24 - eBay (item 320280274080 end time Mar-25-09 19:39:35 PDT)


VU Meter buffer amplifier printed circuit board PCB - eBay (item 130271665364 end time Mar-25-09 15:31:29 PDT)

Its really stupid simple buffer circuit....

The amount of distortion that the meter is bringing in is pretty minimal. I'd worry about other things before tackling this.
Yeah, I agree. I've got other more important stuff to deal with at the moment. I'm just trying to get all of the info I can so that if some crazy deal comes along the way, I can jump on it.
Old 4th March 2009 | Show parent
  #107
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analogtodd's Avatar
 
🎧 10 years
Yeah,
That other link with the buffers has the info, you could fabricate them yourself, lotta work though. You could source the parts for a few dollars I'm sure.
Old 5th March 2009 | Show parent
  #108
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Quint's Avatar
 
1 Review written
🎧 10 years
Lamps are up and running. A bunch are burned out but no big deal. They're definitely getting power because the ones that aren't burnt out are all lit up. Cool.

I put the multi meter to the + 24v and the 0v screws on the barrier strip on the console and I'm getting a reading of 24v yet aren't the lamps supposed to be getting 21v, not 24v? Does this mean that the sense or sense connection is not working properly (ie, not jumping it down to 21v)?

Regardless, up next is the relays and audio.
Old 8th March 2009 | Show parent
  #109
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🎧 10 years
Regular Saturday night update I guess.....

The back of the beast has been broken!!!!!

Even though I was prepared, I cried a little when I did this....
Attached Thumbnails
Just bought an MCI 416b for 0.-mci-528-mar06.jpg   Just bought an MCI 416b for 0.-mci-528-mar07.jpg   Just bought an MCI 416b for 0.-mci-528-mar02.jpg  
Old 8th March 2009 | Show parent
  #110
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analogtodd's Avatar
 
🎧 10 years
And I ended the week with another 5 master section modules for spares!!!!

No magic kids... its just metal, wires, resistors, capacitors, solder and cable ties

When I said "full-tilt-boogie" restoration, I wasn't kidding....
Attached Thumbnails
Just bought an MCI 416b for 0.-mci-528-mar05.jpg  
Old 8th March 2009 | Show parent
  #111
Gear Maniac
 
mattallen's Avatar
 
🎧 15 years
428a modules will not directly plug into a 428b.
likewise 428B will not plug into a 428a.
Part physical, part electrical.
Old 17th March 2009 | Show parent
  #112
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rob S's Avatar
 
🎧 10 years
finally a definitive answer.
on the physical side is it metal work, dimensional or socket motherboard difference.
electrically is it a pin out problem?
i've been looking for two 428B modules but i can only find A's.
thanks
rob
Old 25th March 2009 | Show parent
  #113
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analogtodd's Avatar
 
🎧 10 years
Geesh,
did everybody get bored with MCI stuff?

I've been busy working on mine!!!
Old 25th March 2009 | Show parent
  #114
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analogtodd's Avatar
 
🎧 10 years
Quote:
Originally Posted by mattallen ➑️
428a modules will not directly plug into a 428b.
likewise 428B will not plug into a 428a.
Part physical, part electrical.
Whats different about a 428?
I know I've sat in front of a 416 that had a/b modules. I remember the owner of it said he'd just dropped in the channels... now I guess I shouldn't assume that he didn't have some work done.

I know the 428a and 428b don't have the same cosmetics, but what else.

No problems with 500 modules... but then again, almost EVERY single one of these damn consoles is different in some way or another.
Old 28th March 2009 | Show parent
  #115
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Quint's Avatar
 
1 Review written
🎧 10 years
Quote:
Originally Posted by monkeyt ➑️
Geesh,
did everybody get bored with MCI stuff?

I've been busy working on mine!!!
No loss of interest here. Been busy as hell. As soon as I get her up and running %100 I totally plan on giving the current events story.
Old 31st March 2009 | Show parent
  #116
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rob S's Avatar
 
🎧 10 years
okay, well maybe it wasnt a definitive answer but it sure was confident.
randy blevins didnt seem to think it was a problem to put A's into B's.
Old 19th June 2009 | Show parent
  #117
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mono-poly's Avatar
 
🎧 15 years
What new caps should i get to recap my mci?
Vishay or BC?
I think they continued the Phillips cap line.
Old 19th June 2009 | Show parent
  #118
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Quint's Avatar
 
1 Review written
🎧 10 years
Quote:
Originally Posted by mono-poly ➑️
What new caps should i get to recap my mci?
Vishay or BC?
I think they continued the Phillips cap line.
Maybe Nichicon's? I'd like to know myself. Also the specs too like what uF and what not.
Old 21st July 2009 | Show parent
  #119
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Quint's Avatar
 
1 Review written
🎧 10 years
Anything wrong with putting 416a channels in a 416b?
Old 5th June 2010 | Show parent
  #120
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Quint's Avatar
 
1 Review written
🎧 10 years
Quote:
Originally Posted by monkeyt ➑️
I bought some of the 63/37 off of Ted Weber a long time ago...
https://amptechtools.powweb.com/solder.htm

MCI had some crazy thick gauge wire going to the power supplies, if you keep the distance short, you could get away something smaller, the sense wires don't need to be thick though.

I might step up and do some fancy silver solder as I tear into this 528 though... I'm spending enough on it so why not!!!!

Heres a scary pic, not something many people get to see... I pulled the punch blocks off it today!!!! I used to think PB were awsome, I've grown to hate them... I pulled about 12 pounds of old Beldin cable out of it and I've got a loooong way to go. Gonna redo it Mogami and some standard XLR and ELCO
So did you ever get done rewiring your MCI up to Elco? I'm considering doing this myself so I'm curious how you mounted your Elcos on the back and what problems you ran into.
πŸ“ Reply

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