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Author Topic: Soundtracs PC Midi 24.  (Read 10264 times)

Barkley McKay

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Soundtracs PC Midi 24.
« on: September 22, 2009, 06:16:22 am »

Hi all,

inquiring if anybody has any knowledge of this desk?

Reliability, general sound, insight into its rather odd bussing architecture?


One has come up that has been offered to me for what seems a fair price.


I assume its a basic TL072 and 5532 affair inside.

thanks

Barks

index.php/fa/13375/0/
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Michael Brebes

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Re: Soundtracs PC Midi 24.
« Reply #1 on: September 22, 2009, 11:53:09 am »

It's 5532 and TL074 in the Master Section.  The channels are all TL074.  Replacing them with Linear Technologies LT1358 and LT1359 turns it into a great sounding board. Everything opens up.  All IC's are socketed.  

Bussing is as follows:
Channels 1-8 can be bussed to Busses 1-8 and L/R.
Channels 9-24 can be bussed to Busses 9-16 and L/R.
Channels 17-24 have direct outs since there is no buss associated with those channels.
Busses are chosen in pairs (1/2, 3/4, etc.) and are post Pan pot, which means that Buss 1 is 1/2 button plus Pan Left.

Hope that helps.
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marcel

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Re: Soundtracs PC Midi 24.
« Reply #2 on: September 22, 2009, 01:30:52 pm »

Ummm...  If there are 16 busses on the board in the photo...

Where are they?
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Best, Marcel

Barkley McKay

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Re: Soundtracs PC Midi 24.
« Reply #3 on: September 22, 2009, 06:00:54 pm »

Thanks for the response.

Yes it is confusing as to where the 16 busses are!

hers another shot of the busses:

index.php/fa/13379/0/

How would one do a submix on this desk or potentially a parallel submix?
Do a couple of the channels become the submix when associated with the BNC (bounce?) button?


inquiring minds...

barks
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Michael Brebes

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Re: Soundtracs PC Midi 24.
« Reply #4 on: September 23, 2009, 12:07:13 pm »

It's an in-line design board, so the busses are on each channel strip.  The level and pan controls are right above the Mute and Solo buttons at the top of your last picture.  There is also a "Split" control in the EQ that splits the high and low shelf to the buss/monitor section.

If you don't have one, I highly recommend getting a copy of the user manual.  I believe the Soundtracs support people in the UK have a pdf you can purchase.
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Barkley McKay

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Re: Soundtracs PC Midi 24.
« Reply #5 on: September 23, 2009, 04:42:20 pm »

I do have a pdf on the desk but its still not totally clear to me, especially as it does not have a real routing schematic.

So basically, the buss groups only work in each, self contained 8 channel block?

Channels 1-8 can only be bussed around within that particular block, but not across to channels 9-16, and vice-versa?

So if I wanted to Submix a drum kit to buss 1-2 from channels 1-8, the buss output would be seen at the tape output of channels 1-2. I'd then need to route them back in to unused channels to gain the functionality of a submix pair (plus acces to an insert)?

Also, you are saying that channel 17-24 only work on the direct out, so are the bus buttons redundant here?

thanks for the info so far!

barks

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Michael Brebes

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Re: Soundtracs PC Midi 24.
« Reply #6 on: September 24, 2009, 01:05:55 pm »

Busses 1-8 are fed from Channels 1-8.  Busses 9-16 are fed from Channels 9-24.  Since channel strips 17-24 don't have an associated buss, they have direct outs.

When submixing to a buss, like in your example of submixing to 1/2, there are the associated Level and Pan pots for feeding each of those busses to the Main L/R mix.  Those are the knobs directly over the Mute/Solo buttons on your picture.  If you could send me a copy of your pdf file, I could walk you through it better.  My hard copy manual is in my home studio, but I am at work so can't reference it.

Channels 17-24 can be bussed to 9-16 and have direct outs.

If I remember, there is a block diagram in the manual that should give enough detail for how the routing is.
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marcel

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Re: Soundtracs PC Midi 24.
« Reply #7 on: September 24, 2009, 01:12:28 pm »

Barkley:

If there is a 'tape out' on each channel (bus), then there must be some way of getting 'back in' to that small fader (pot) that Michael points out (or do those just provide internal access from the bus to the main mix?).  Are there tape returns?  That would be (functionally) an insert point, no?
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Michael Brebes

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Re: Soundtracs PC Midi 24.
« Reply #8 on: September 25, 2009, 12:46:20 pm »

The buss level and pan pots have a switch associated with them so that they can be also used as another set of inputs, which brings the count up from 24 to 48.
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jeremy glover

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Re: Soundtracs PC Midi 24.
« Reply #9 on: March 03, 2010, 06:35:33 am »

Michael Brebes wrote on Tue, 22 September 2009 10:53

It's 5532 and TL074 in the Master Section.  The channels are all TL074.  Replacing them with Linear Technologies LT1358 and LT1359 turns it into a great sounding board. Everything opens up.  All IC's are socketed.  

Hope that helps.


this is from the studiosystems uk website:


The LM4562 has a better noise spec and higher slew rate. The 55MHz bandwidth 
is great but be careful of compensation and stability under unity gain.
Another factor is that the max V is +/-17V and may cause offset if not 
failure problems as well as limit headroom.
The 5532 is still the baby to stay with and has a bit more crunch in the 
sound but fuller sound vs bandwidth.If you would consider trying the OPA2107 
for the 5532 only in the Master summing or fader booster I believe you may 
be more pleased even though I still think you will move back to the 5532.
The LT1359 is a very impressive chip from checking the spec sheet and seems 
to be unity gain comp'd. The operating voltage may again cause a problem and 
be extremely careful with overshoot and ringing as it is a very high slew 
rate amp. Never saw one for audio application with 600V/us and would feel 
that would have a very fragile high end and possibly limited low end.
Please be careful to not exceed the specified rail voltages.I am sure that 
you will find that the TL074's have the warmth and fullness that is more 
classic to the vintage console sound.
Please let me know how the test goes. I would appreciate it. Talk with you 
soon.
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jeremy glover

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Re: Soundtracs PC Midi 24.
« Reply #10 on: March 03, 2010, 06:36:48 am »

Michael Brebes wrote on Tue, 22 September 2009 10:53

It's 5532 and TL074 in the Master Section.  The channels are all TL074.  Replacing them with Linear Technologies LT1358 and LT1359 turns it into a great sounding board. Everything opens up.  All IC's are socketed.  

Bussing is as follows:
Channels 1-8 can be bussed to Busses 1-8 and L/R.
Channels 9-24 can be bussed to Busses 9-16 and L/R.
Channels 17-24 have direct outs since there is no buss associated with those channels.
Busses are chosen in pairs (1/2, 3/4, etc.) and are post Pan pot, which means that Buss 1 is 1/2 button plus Pan Left.

Hope that helps.

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Hallams

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Re: Soundtracs PC Midi 24.
« Reply #11 on: March 22, 2010, 12:54:42 am »

I purchased one of these in the late 90's for around $1000. After using it for a month i sold it for $1000. Mine had a mod adding transformers to the inputs. I got rid of it because i didn't like the sound. To my ears the mid eq was cloudy and / or muddy to the extent that it was unusable.

Michael Brebes advice might fix this?
Quote
It's 5532 and TL074 in the Master Section. The channels are all TL074. Replacing them with Linear Technologies LT1358 and LT1359 turns it into a great sounding board. Everything opens up. All IC's are socketed.[end quote]

At the time, I preferred the A&H mixwiz. It might have been something to do with the particular board i had but i suspect not. Have a good listen and try a mix on it before you buy is my recommendation.
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Chris Hallam.
Melbourne, Australia.
 
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