SSlmixed.com Forum

Tech discussion => 4K,6K,8K Series => Topic started by: xmax on March 24, 2015, 08:51:53 PM

Title: 6K add on C buss
Post by: xmax on March 24, 2015, 08:51:53 PM

Does anybody have the pin outs for the 10 way ribbon connectors for the 6K C buss,
It looks like SSL added some long skinny pcb's under the bucket backplane. The
manuals I have state it is on S3E but it does not seem to be the case....

Title: Re: 6K add on C buss
Post by: xmax on March 24, 2015, 09:04:22 PM

Found it! S125E
pin 2 C Left
pin 5 C Right

everything else is 0v

Title: Re: 6K add on C buss
Post by: waltzingbear on March 25, 2015, 04:01:57 PM

and its always slightly noisier than A or B buss.

Alan

Title: Re: 6K add on C buss
Post by: xmax on April 09, 2015, 03:28:32 PM

In the beginning SSL had the C-buss mixed in with the logic S3E ribbon, I imagine they did this to
improve the noise, I wonder if the early ones gave C a bad reputation, In this case with the 990
summing C was quieter than A which is now a stock 4K.

Title: Re: 6K add on C buss
Post by: waltzingbear on April 09, 2015, 06:16:53 PM

could you expand your comments?

the 6K board I am familiar with has a noisier, not by much, buss noise on C.
don't know which cable they used, mostly ac related noise.

990 summing? is this a summing buss with a 990 summing amp substituted?
would seem to be almost coals to newcastle as the input is very similar, but not quite. 

Title: Re: 6K add on C buss
Post by: xmax on April 10, 2015, 02:41:35 AM

If you look in mainframe wiring section of the manual it shows S3E ribbon as the summing busses to feed the hex buss C amplifier (5&6).
At some point they added a small thin pcb that ran under the S3E area of the bucket mother board and moved the C-buss  L and R from S3E to this small added on pcb
(on the bucket backplane pcb bottom). The desk I was working on has API and 990 opamps on the B and C busses as mix/master amps.

Title: Re: 6K add on C buss
Post by: aaladhamy on May 20, 2015, 09:01:00 PM

hey there!

My C bus on my 600 has been giving me some bad problems... the R channel intermittently gets very noisey and swooshy which stops when I either touch a capacitor on it, or tap the cables attached to it. Does anyone have the schematics for it? i want to recap and replace all the parts... Also its strange that the final output is determined by this bus as well... even if i have nothing sent to the C and it is off the noise still comes through the stereo out...

thanks for any help!

Title: Re: 6K add on C buss
Post by: xmax on May 28, 2015, 05:35:30 PM

Check the technical documents section.

Title: Re: 6K add on C buss
Post by: aaladhamy on June 05, 2015, 04:20:33 AM

can't find it on there! am i missing something? cheers!