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Help needed with this mysterious mixer
Old 17th April 2011
  #1
Gear Maniac
 
cuebism's Avatar
 
🎧 10 years
Help needed with this mysterious mixer

As Dr. Nick Rivera would have said:

"Hello everybody!"

I recently scored this interesting looking little mixer which turned out to be quite the amazing sounding piece. It's an old 9 (!) channel Philips mixer which seems to have been intended for broadcasting related tasks.
It's designed without a bottom panel, obviously to lower it into a studio desk.
Balanced XLR in/out line & Mic, Neutrik input transformers and some unknown output transformers. Each channel with a simple 3 band eq, plus locut at 120hz.
The master channels has a switchable limiter with it, unfortunately the left/right balance is completely off when engaging this.
I would LOVE to fix the limiter-issue as well as be able to either repair or upgrade other bits & parts inside, but there is literally no info whatsoever about this mixer anywhere.
Also there are two fuses missing in the PSU, but the mixer works nonetheless - wondering if those might be for Phantom-powering?
No switches for that anywhere though (apart from those mysterious grey push buttons on the back panel)

The name of it is Sound Mix-5, made in Holland and the Modell Nr. is LBB 1147/00

I really hope that somebody here either knows this one, has a schematic or actually any further info on this. It would be so helpful!

The sound so far is amazing, very low noise level, thick eq and nice saturation when pushing it...

Oh, and of course there was a mummified spider in it. My third so far...
Attached Thumbnails
Help needed with this mysterious mixer-philips_top.jpg   Help needed with this mysterious mixer-philips_top2.jpg   Help needed with this mysterious mixer-philips_io.jpg   Help needed with this mysterious mixer-philips_gutz.jpg   Help needed with this mysterious mixer-philips_gutz2.jpg  

Help needed with this mysterious mixer-philips_gutz3.jpg   Help needed with this mysterious mixer-philips_input_xformer.jpg   Help needed with this mysterious mixer-philips_output_xformer.jpg   Help needed with this mysterious mixer-philips_serial.jpg  
Old 21st April 2011
  #2
Here for the gear
 
🎧 10 years
I'm curious about this one as well! Anyone?
Old 22nd April 2011 | Show parent
  #3
Lives for gear
 
AshleySmith06's Avatar
 
🎧 15 years
Have you tried contacting Philips? I'm sure they'll have a manual floating around somewhere.
Old 22nd April 2011 | Show parent
  #4
Lives for gear
 
Studerfreak's Avatar
 
🎧 10 years
"LBB" definitely points to Philips.
They used this identification for a lot of professional equipment.
Old 22nd April 2011 | Show parent
  #5
Gear Maniac
 
cuebism's Avatar
 
🎧 10 years
Thanks a lot for your feedback - I actually just chatted with philips customer support, but of course they've never heard of it, nor know who to contact concerning discontinued products....
Old 22nd April 2011 | Show parent
  #6
Lives for gear
 
🎧 10 years
This should be a very easy to fix straight-forward design since there´s no too much electronics inside. Recap the cards where the limiters are located and then check again what´s up. On the pictures I can see quite a bunch of tantalum caps which may be prone to failure regarding the age of the desk.
Old 22nd April 2011 | Show parent
  #7
Gear Maniac
 
cuebism's Avatar
 
🎧 10 years
Danke für den Tip!

I was actually not aware that Tantalum caps are prone to age-related failure as well... Will check via successive recapping and see what happens.

What I like about this mixer is just that - that it is not overcrowded with components. With these things less is more
Old 22nd April 2011 | Show parent
  #8
Lives for gear
 
🎧 15 years
maybe its a not so old live event board...rock on.
Old 22nd March 2012
  #9
Gear Maniac
 
cuebism's Avatar
 
🎧 10 years
update

Almost a year has passed and finally I've had the time to recap and thoroughly clean this mixer. I did not modify anything, nor did I add any polyprop bypass caps. Just wanted to hear how it sounded using fresh / high grade capacitors (the usual panasonic fc/fm as well as some rubycons,plus Wimas in the EQ section). Did not swap any of those 5534 opamps either as it didn't really seem necessary.

The limiter stereo tracking issue has been fixed as well, playing with the trimpots underneath (learning is fun) which adjust the release time.

Verdict:

I am blown away. There is no noise to really speak of, feeding padded line-signals to the mic-preamps going through those neutrik transformers, pushing them a bit on the way in and out adds a wonderful, almost tape-like saturation/compression effect that can be pushed quite far before it starts to get too crunchy.
And setting the limiter to fastest release turns it into a heavy drums-smashing compressor!

Since EQ and Aux-Sends are bypassable this mixer can be VERY clean.

I wonder what the Phoenix Nicerizer does to a signal, but if it's character is anywhere around the same ball park as this little mixer's - oh well, I could save the money then.

It's only got 9 Channels, no phantom power and doesn't look too sexy, but I warrrrmly recommend this as a very potent colorbox/summing unit, that is if you can find one.

And now back to the program.
Attached Thumbnails
Help needed with this mysterious mixer-philips_top2.jpg   Help needed with this mysterious mixer-philips_top.jpg   Help needed with this mysterious mixer-philips3.jpg   Help needed with this mysterious mixer-philips2.jpg   Help needed with this mysterious mixer-philips5.jpg  

Help needed with this mysterious mixer-philips4.jpg  
Old 27th July 2012
  #10
Here for the gear
 
🎧 5 years
Hi
I own one of this from 1990,and still works very well.I know that I have a photocopy of the user manual with specs,etc...
If you are still interested,I will try to locate it and do a scan.

Best regards from Spain
Old 23rd June 2017
  #11
Here for the gear
 
Mixer not working.

Hi cuebism, I also have a mix-5 and now I have a problem, I have no output signal (on XLR) instead on the headphone jack I signal. I asked on the site if anyone still has a manual or electric diagram yet nobody answers. I just opened the whole mixer to begin troubleshooting, longer work without schematic but I think I'll manage.
Old 23rd June 2017
  #12
Lives for gear
 
Studerfreak's Avatar
 
🎧 10 years
I just have sent you a P.M.
Old 26th June 2017
  #13
Here for the gear
 
Tnks Studerfreak, I wrote you.
Old 7th September 2018
  #14
Here for the gear
 
🎧 5 years
Philips service manual

Hi all

The service manual is here:

http://www.sterremuur.nl/manuals/Mix.../LBB1147SM.pdf
Old 11th April 2021 | Show parent
  #15
Here for the gear
 
🎧 10 years
Quote:
Originally Posted by lpla ➡️
Thank you!
Old 13th April 2021
  #16
Here for the gear
 
🎧 10 years
Does someone still have or point me towards a copy of the "Operating Manual" of this unit? Would be greatly appreciated.

Here's a picture of it: http://www.armanax.com/mesa-mezclas-...-1147-00.html#
Old 13th April 2021 | Show parent
  #17
Here for the gear
 
🎧 10 years
Quote:
Originally Posted by cuebism ➡️
Almost a year has passed and finally I've had the time to recap and thoroughly clean this mixer. I did not modify anything, nor did I add any polyprop bypass caps. Just wanted to hear how it sounded using fresh / high grade capacitors (the usual panasonic fc/fm as well as some rubycons,plus Wimas in the EQ section). Did not swap any of those 5534 opamps either as it didn't really seem necessary.

The limiter stereo tracking issue has been fixed as well, playing with the trimpots underneath (learning is fun) which adjust the release time.

Verdict:

I am blown away. There is no noise to really speak of, feeding padded line-signals to the mic-preamps going through those neutrik transformers, pushing them a bit on the way in and out adds a wonderful, almost tape-like saturation/compression effect that can be pushed quite far before it starts to get too crunchy.
And setting the limiter to fastest release turns it into a heavy drums-smashing compressor!

Since EQ and Aux-Sends are bypassable this mixer can be VERY clean.

I wonder what the Phoenix Nicerizer does to a signal, but if it's character is anywhere around the same ball park as this little mixer's - oh well, I could save the money then.

It's only got 9 Channels, no phantom power and doesn't look too sexy, but I warrrrmly recommend this as a very potent colorbox/summing unit, that is if you can find one.

And now back to the program.
Mine surely does have phantom power on all channels, trying to figure out in the service manual how to disable those as I'm not sure if I burn my audio interface when I reproduce your tip to connect through the mic inputs for the Neutric saturation. How did you pad your signal btw? Do you still have the mixer? Or some additional documentation you can share? Thanks and greetings from The Netherlands.
Old 13th April 2021 | Show parent
  #18
Lives for gear
 
1 Review written
🎧 5 years
Quote:
Originally Posted by lpla ➡️
I loved reading this! Thank you!
Old 14th April 2021
  #19
rez
Lives for gear
 
rez's Avatar
 
1 Review written
🎧 10 years
Hello!

According to the service manual the internal 12v (!) phantom power is always active at all the mic inputs.

There is however one way to cut the phantom power by inserting a plug into the unlabeled 3.5mm jack in the top left corner of the backpanel.
This jack is meant to be used with an external power supply if you need/want to have true 48v phantom power on the mic inputs.
The 3.5mm jack has an internal connection for the 12v phantom power that gets broken if a plug is inserted.

The "mysterious" grey switches on the back panel switch the line inputs (which each has two parallel inputs on xlr and old school din jacks) from balanced to unbalanced.

If one wants to feed the mic inputs from line outputs of an audiointerface to get some of the transformer saturation then be aware of the level and impedance mismatch as those mic inputs don´t expect line level signals that can be a thousand times stronger! (-40db to 0db is like 0.0078v to 1v!)
For this kind of connection some sort of DI-box is needed to match the line level signal to a mic input.

peace, rez
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