Soundcraft 600 Restoration

Founded in 1973, Soundcraft first made its mark with the launch of the Series 1, the first mixing console in a flightcase.

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Re: Soundcraft 600 Restoration

Postby Gonecat » Sun Mar 30, 2014 10:20 pm

Cleaned the pots and switches on first 8 channels with CRC non-residue contact cleaner. This cleared up every single issue i was having on those channels except for two things: one channel was producing no sound at all, and another had a fader that would barely budge.

I pulled the channel that wasn't making any sound and upon close inspection saw that the 3 resistors at the top near the input section, which are installed vertically instead of parallel to the circuit board, were smooshed together with their leads touching. Bending these back in place fixed it and the channel sounds great.

The fader problem wasn't so easy. Turns out the fader's 'frame' was completely bent outta whack (see pix). So i pulled it completely apart, cleaned everything, bent the frame back into place, re-installed, and this is now the smoothest fader on the board. :-)

Some words of caution when pulling these Alps faders apart for anyone who actually knows less than me about it. The little pins that you must pinch together to pull the sides off are a pain in the butt - don't pinch them together entirely or it's a real pain to separate them again (at least on this one) when you're trying to re-assemble it.

Watch out for those contacts that drag across the resistive board (inside the whitish-yellow plastic square part), don't want those things bent.

The metal frame is not meant to bend much or it'll definitely break.

I cleaned the red panels with denatured alcohol and a qtip. Pulled off some of the cotton and was able to clean the tube (which the rail goes thru) on the white plastic square thing (see pic), it was pretty dirty.

Image

Image

The 2 guide bars i cleaned off with a rag, then, for lack of anything else on hand, used petroleum jelly to lube them up (insert 'gasp' here). I'll hold off on doing any others till I have some proper 'fader lube', but for now that jelly is doin the trick - that fader slides effortlessly.

Image

As much as I love using a wire brush to clean 932 pieces of tiny metal, I love my finger tips a little more :-) So i got a gallon of Metal Rescue (non toxic and reusable, won't hurt paint, etc) from Homedepot for $20, dropped those rusty nuts and washers in for a couple hours; rust gone, finger-tips in tact.

Image

Going to try using it for all that rust in the bottom of the chassis too after some steel-wooling.

So, when checking the 48v buttons i heard that sound typical of 48v actually coming on...(earlier in the thread i mentioned that the 48v light wasn't coming on on the PSU). Well, phantom is working, i plugged in my cheapest condenser and it worked just fine. Cool.

Some of these channels have black (instead of the usual purple) electrolytics, so I'm assuming someone recapped a few of them. I don't see any small by-bass caps or anything.

All in all, the noise floor is acceptably low, the pres sound very usuable.

In an effort to avoid redundancy and to better understand this console, I am still trying to figure out what Jim Williams was saying was 'done' in v7 or v9 boards that wasn't done previously, if anyone is familiar, please lemme know. This board is v9.
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Re: Soundcraft 600 Restoration

Postby Gonecat » Sat Aug 02, 2014 9:13 pm

After moving houses (partly to accommodate a very large mixer!) and recording 12 songs with my band, I am finally back to working on the SC600.


The first thing i need to do to integrate this board into everyday life is add mono inputs so i can run all my synths into it without transformers. 8 channels should do the trick.


I took a look at the schemos and it seems i can just patch into the channel's top cable ("Conn 1"- not the ribbon cable) at pins 3 and 4.

But i see this -30db attenuation circuit for the line inputs that's located on the back PCB.


My Questions:

Do i need to run through a 30db-cut circuit to do this?

Would there be probs with it also being normalled to the patchbay?

Any suggestions for running unbalanced mono signals into the board in general?
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Re: Soundcraft 600 Restoration

Postby ric3xrt » Sun Aug 03, 2014 3:37 pm

Just pick up My 600 yester day....Would love to help with your Question, but Man I'm clueless when it comes to that.
I am following this thread closely....
Ric
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Re: Soundcraft 600 Restoration

Postby Gonecat » Sun Aug 03, 2014 3:46 pm

Ha, well congrats on the acquisition! Friggin great board for the bread.
Which one did you get and how's it runnin?
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Re: Soundcraft 600 Restoration

Postby ric3xrt » Sat Aug 09, 2014 7:04 pm

Its 32 With patch bay like yours, I'll try and post some photos this week, It came with a busted power supply but I have a spare 450/b I have to find out if this one I bought the other day will work with the board its for a series 800,
Mine came with a bunch of spare channels and Penny and Giles faders, They never installed.
Now I have to figure out the Elco/Edac connector deal, and how the patchbay works.
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Re: Soundcraft 600 Restoration

Postby Gonecat » Tue Aug 12, 2014 11:23 pm

Yeah please do post some pixies! What sort of situation will you be using it in?

Elco's - i share your pain, brother. And i am not even there yet.
Just ordered up 180' of some Canale cabling and a ton of balanced connectors.
I keep telling myself: at least my gear will be integrated and i can use the friggin patchbay.


Cabling came from MarkerTek.

The 1/4" balanced plugs came from Futurlec. Also grabbed some 2SA1316 transistors from them for changing up the preamps on a couple channels of the board.

Those transistors seemed hard to find elsewhere, as well as the others that Jim Williams has suggested online (which I found damn near impossible to find) - so add to that a total mastery of these mixers and there's no doubt that those with the budget should go to Mr. Williams for his mods.
Myself, I am a junky of tinkering and DIY and learning this stuff hands-on.


I *almost* understand the patchbay and config of the board. Definitely almost.

One thing that trips me out is it seems the aux sends go out via 6 XLR's on the back but the returns for them come back in thru the Elcos - (there are no returns on the back side). WTH?!


Anyway, that patchbay is calling my name out, so i press onward.

Looking forward to the day (year?) i have it rollin.
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Re: Soundcraft 600 Restoration

Postby Gonecat » Sat Sep 13, 2014 4:59 pm

Ok, got some Elcos wired up - fun stuff!

A very cool thing is that it doesn't matter which tape-ins you wire up on the Elcos, you can route them wherever you want using the patchbay.


One other thing standing in my way was handling the monitoring.

So i built a switchbox which sends the soundcard straight to my Rokit 8's, or it sends those outputs to the Elco's tape-ins instead and monitors the board. Uses an 8PDT switch for that and i put a switch to select between my balanced spkr outs or a set of unbalanced outs; and a volume control.

Pix attached.

It was a momentous occasion for me to finally pull my tracks up on the 600 for a little stem mixing! So much better than using a mouse and sounds so much punchier, too. Nice to be able to hit that 8PDT switch and hear the difference the board makes on the fly.



Bought Caig Fader-lube. Read and followed directions. Now maybe i have to take every fader apart and then apply this, but it otherwise didn't help a damn thing in any way shape or form that i can tell.
However the fader i used petroleum jelly on still glides along smooth and silent after 4+ months. I did rebuild that one, but it's still all janky compared to the others. Strikes me the real difference is running the q-tip through the white pieces and getting the junk off of the rails (see my earlier post for pix). Then you could probably even use ear wax and they'd be fine and save yourself $13 a can!!
Attachments
switcher.jpg
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Re: Soundcraft 600 Restoration

Postby Gonecat » Sat Sep 13, 2014 5:13 pm

Hmm, my image upload didn't go thru - so here's a link to that photo of my switch box:
Image
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Re: Soundcraft 600 Restoration

Postby Gonecat » Sat Sep 13, 2014 8:31 pm

@ric3xrt:

if you need any info or schemos for the Edac connectors, let me know.
I did manage to get my head around both the tape I/O and tie line connections for them, despite what dastardly few details there were to find on the net.

still waitin' on them pix of your new board! :-}
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Re: Soundcraft 600 Restoration

Postby Calgonstudio » Sun Oct 05, 2014 7:49 am

Here's a photot of Ric's board, I met him last week when I was in Quakertown, this is a photo taken at the studio it was bought from
Attachments
S600side.jpg
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