New Calrec M Series owner, hello

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Re: New Calrec M Series owner, hello

Postby Factory Street » Sat Dec 11, 2010 5:02 am

An update on my desk.....
I have finished installing the monitoring for multitrack, it all works 8) The bantam patchbay was a real pain to get apart, each plug required the services of 3 different screwdrivers just for 1 screw (despite going and buying the appropriate screwdriver in an attempt to make life easier) and I had to get 7 rows of 40 plugs off to get at the ones I wanted.

I have reconfigured a couple of the edacs on the desk to go with the edac connectors I already have wired up to the multrack inputs in the studio (tape and computer)

I have rigged up a test listening setup and started going through the channels 1-10 all work as expected only another 30 to test.

The monitor section of the desk appears to be working as expected, I like the various features it should be good to use, pfl on the faders is a great idea.

My main problem is.....

The talkback mic is getting 17v (I'm guessing from the audio rails), and when the talkback mic is plugged into it's lead the audio rails drop on one side. If i plug a dynamic mic into the talkback lead it doesn't pull the voltages down but condensor mics do.
When I pull the feed from the audio rail to the talkback amp the voltages aren't pulled down.
The number of the amp is TN 1820
Another thing that is confusing me, the input for phantom power to the desk has two seperate supplies, one goes straight back out to the tailboard connector, one goes off into the desk.
When I measure the voltages to earth on the desk, the one that supplies the desk (presumably the talkback mic and nothing else) shows -8v on the negative pin and 40v on the positive. The other supply appears normal.
I'm guessing the two problems are related

So pinouts or a schematic for TN1820 talkback mic amp would be a big help right now.

Cheers
Alex
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Re: New Calrec M Series owner, hello

Postby Factory Street » Sun Dec 19, 2010 5:19 pm

So the whole problem with te talkback mic was a poor earth on the board the talkback mic amp plugs into. Thanks to Stephen Brant at calrec for pointing me at that.
There are two earth colours for the wiring black and green, the black was not earthed to the chassis but the green was.
The talkbaclk mic is intended to be supplied by the 17v rails as it turns out. it appears the only reason for p48 to the desk is to reassure the psu fail circuit.
It appears to be a similar issue with the 48v supply.
Now just the psu fail circuit to sort out, it all appears to be getting the correct voltages, I am treating a poor earth as the likely suspect....

So, it's all going pretty well, I have the looms all pinned ready for putting into the edac bodies, some minor patchbay mods, the mic inputs sorted out. and I plan to get it installed over the christmas break.
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Re: New Calrec M Series owner, hello

Postby Factory Street » Wed Dec 29, 2010 4:56 pm

Well, it's in.

All plugged in and ready to undergo extensive testing.
Off to bed now and on with that in the morning.
lets hope nothing too major rears it's ugly head, recording booked in on Sunday.
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Re: New Calrec M Series owner, hello

Postby DraytonTom » Thu Dec 30, 2010 6:48 am

Hi Alex

Hope all goes well, I managed to fire up one of my modules and do a few comparison tests, with the Digidesign Profile I was touring back in December.
Obviously comparisons like this are purely subjective, but for me the PQ was back to the: good source + right microphone = fantastic sound, way of doing things.
One thing I did find however was that when I was leaving I grabbed 2 of the 6 PQ modules I have at random, when I tested them, the first sounded decidedly low-end light, whereas the second sounded fantastic. Presumably the first module had seen a lot more use, and is in need of recapping.
What struck me was that the difference wasn't in any way subtle.
I would imagine the degradation of the elcrolytics in your modules will be consistent due to them all being from the same console, and therefore being the same age, same amount of "on" time.
Just something to look out for...

Hope you have a good debut session!
Cheers

Tom
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Re: New Calrec M Series owner, hello

Postby Factory Street » Thu Dec 30, 2010 9:07 am

Hi Tom,
Interesting, as I get round to it I will be recapping the whole desk but so far I haven't noticed anything like that.
Are both the modules the same revision? colud it be a different circuit design?
I did notice when I recapped the old soundcraft that the difference was amazing.
I have a couple of modules in mine that are newer (grey buttons) and one that is older than the rest.
I'm just getting the patchbays labeled now and then on to testing and finding out what it really sounds like.
Cheers
Alex
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Re: New Calrec M Series owner, hello

Postby Factory Street » Fri Dec 31, 2010 8:37 am

Here are some pictures of the move and some other stuff.

http://www.flickr.com/photos/factoryststudios

The old soundcraft looks really small in comparison.

That's now for sale.
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Re: New Calrec M Series owner, hello

Postby DraytonTom » Mon Jan 03, 2011 2:51 pm

Hi Alex

Great pics mate, the ones of the console without the modules have been a great help in figuring out how they kept everything cool!

Cheers

Tom
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Re: New Calrec M Series owner, hello

Postby Factory Street » Thu Jan 06, 2011 1:19 pm

I did my first mix on it last night.
What a great sound!
Clarity and separation are fantastic.
So now I am sitting and looking at it most of the day, everyday, does anyone know a source for the coloured caps?
I need a selection of the small size (11.5mm i think), the black ones are available from canford but not the coloured in that size. I contacted Sifam but they have a minimum order value of £100 (I need about £10 worth at a guess)
Any ideas?
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Re: New Calrec M Series owner, hello

Postby DraytonTom » Fri Jan 07, 2011 6:24 am

Hi Alex

What colours do you need? I know one of the service companies I use/work for have a large tub of miscellaneous end caps from repair of hire stock over the decades, I am popping down next week, so if you give me a wish list i will see what I can find.
They actually mentioned that that same knob size is used on the new Drawmer DS stuff, not sure what colours they use, but you might be able to try ordering from there as spare parts...

Cheers

Tom
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Re: New Calrec M Series owner, hello

Postby Factory Street » Mon Jan 10, 2011 6:02 am

Hi Tom,
that would be great if you could have a look.
I need;

13 yellow
7 grey
2 green
2 red

Good tip for the drawmer stuff

Did the first proper session on the desk over the weekend, so in three days of things stopping working and overheating the desk didn't complain once. 8)

Cheers
Alex
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