ROYAL OPERA HOUSE CALREC REFURB

With a comprehensive range of mixing consoles, Calrec has been a manufacturer of high quality audio products since 1964.

Moderators: GJC Designs, Richard Lumb

Re: ROYAL OPERA HOUSE CALREC REFURB

Postby Matt Syson » Wed Jul 07, 2010 1:12 pm

Hi
I would suspect that dried out electrolytics could be at least part responsible for oscillation as the peformance of caps change significantly over 18 years in a hot box. It's the 'little' ones on the PCB, not necessarily the 'biggies'.
There is not enough space in my workshop to stand back to take a picture!
Matt S
Matt Syson
Engineer
 
Posts: 1028
Joined: Sun Oct 08, 2006 6:04 am
Location: North UK

Re: ROYAL OPERA HOUSE CALREC REFURB

Postby Richard Lumb » Wed Jul 07, 2010 1:56 pm

Hi Guys,
Sorry for the late response, this will be the third time I have tried to post a reply.
Hope this time it works
I remember this console being tested when Matt was my boss shortly after starting at Calrec in 1985.
It was reliability tested by bouncing it up and down the cobbles at the back of the factory. Someone got a green frog award for that, LOL. but that's another story.
I have now clocked up 25 years. 10 years were as head of desk test during the analog years.

The displays are 101 segment and I still have 2 red ones in my tool box from UA8000 days.

In response to the buttons, SM, M/S omni, M/S patch. As this desk was for theatre work I would imagine these are TB to Stage manager, Main stage all, and Main stage patch point as these are next to the other TB buttons. It will just be a switched TB feed out the back of the desk. Check the patch bay and schedules for reference.

Matt has a far better memory than mine ever was.

Richard
Richard Lumb
Analog Enthusiast
 
Posts: 24
Joined: Mon Mar 10, 2008 2:06 pm
Location: Halifax, West Yorkshire

Re: ROYAL OPERA HOUSE CALREC REFURB

Postby Matt Syson » Wed Jul 07, 2010 2:17 pm

Hi Richard
I was wondering what had happenned to you.
I take it from your comments about the 101 LED displays that they are no longer really available. A shame really as I could happily use some if they were 'current production'.
Best regards
Matt S
Matt Syson
Engineer
 
Posts: 1028
Joined: Sun Oct 08, 2006 6:04 am
Location: North UK

Re: ROYAL OPERA HOUSE CALREC REFURB

Postby sebastian747 » Wed Jul 07, 2010 3:25 pm

Well here is the conclusion at the end of a long test day!!! It works ...i was amazed, all the routing logic, vca stuff patch bay inserts the lot seem ok ...we have not tested all modules but in its basic form it works. We discovered that the Audio PSU provided the 5V to part of the logic control??? and some juice from the Phantom PSU lights up the meter bridge???? strange but fine. However ...and there is always gonna be somethings that are really odd. We cant find a main mix buss??? not in the flow drawings or anywhere, and the Pan pots only appear to pan the group signal rather than the channel signal. there is no phantom switching, and channels 33-40 are sort of Aux master faders?? but they still can control group signals???
In the pix you can see the shot of the group fader and above it the switches...well we thought that the signal to "Main mix" would be the one marked "O/P MIX" (output to mix right?) but all it does is stop the group fader working...it kinda floats it, why? We could only get signal to the main monitor section by PFL, or AFL from the group fader,the AFL button on the MAin fader does not work anywhere on the console...a fault on a logic card?...god only knows but the PFL micro switch on the P&G fader does?
Anyway a mixed bag and Im not sure if i have the will power to build in a mix bus...taking into account that it needs a mix insert, some kind of channel Pan control, not to mention general fault finding. Anyway chaps if you can shed any light that would be great: Might it have a stereo mix buss? that would be a start?
Attachments
IMG_0671.jpg
Group fader switches??
IMG_0668.jpg
Notice the Led where the channel number would be UA8000 carry over me thinks? Rec ready Lights?
IMG_0667.jpg
LED Test...like christmas.
IMG_0666.jpg
PSU's being turned on
sebastian747
VU Meter Specialist
 
Posts: 28
Joined: Tue Jun 01, 2010 2:06 am
Location: Bath England

Re: ROYAL OPERA HOUSE CALREC REFURB

Postby Matt Syson » Wed Jul 07, 2010 4:04 pm

Hi
Well done!
I think you will have to help us out with some photos of the main block diagrams as you are now the only ones with a copy.
There is possibly no stereo bus as the ROH monitoring was not 'stereo' as such although I could be wrong. If it exists it will be on the block schematics.
The 5 volts is 5 volts 'logic' used to 'power' analogue switch gates (4053 typically) so was 'part analogue' supply. As the requirement is quite low current it uses regulators in the desk from +17 supply rail. The 8 Volts is the 'dirty' switch, relay and LED supply.
There is probably enough in there to make a useable desk, just relabel things!!
You have to bear in mind this is an 'un- mixer' with so many outputs as it fed many power amps / speakers around the auditorium, maybe 6 or more on each level of seating and there were 3 or more levels.
The block schematics are the most useful diagrams I have seen as they list all in / out connections of everything so fault finding to 'block' level is easy, all the pin numbers are there.
Good luck
Matt
Matt Syson
Engineer
 
Posts: 1028
Joined: Sun Oct 08, 2006 6:04 am
Location: North UK

Re: ROYAL OPERA HOUSE CALREC REFURB

Postby Richard Lumb » Wed Jul 07, 2010 4:24 pm

Hi Guys,
The 101 led displays haven't been used since those heady days that finished at AMS or there abouts, Calrec used discrete LEDS for alot of bargraphs and then came surface mount which were used until now.

Anyway, the main mix buss routing buttons on the UA8000 were the last 4 at the bottom of the matrix. The UA only had 32 tracks and 2 mains.
This console replaced the 2 mains to gain 36 busses.
The big led was the ready rec indicator, not sure what it's used for in this instance.
O/P mix sounds right, it may be lurking somewhere on the patch bay as FOH speakers?
I remember trying to get my head around this board when we had the schematics in front of me, even harder now without it.

Richard
Richard Lumb
Analog Enthusiast
 
Posts: 24
Joined: Mon Mar 10, 2008 2:06 pm
Location: Halifax, West Yorkshire

Re: ROYAL OPERA HOUSE CALREC REFURB

Postby sebastian747 » Wed Jul 07, 2010 4:36 pm

Hi Richard....hmmm maybe a ray of light from the gloom, ill try and get some pictures of the drawings ...perhaps ill email them rather than post them as they need to be a little big so the detail can be seen. I am surprised how complex the channels are. We did guess about the rec ready UA8000 light on this console its just a channel number nothing more.
We also were guessing that the two XLRS on the back of the console are monitor L+R ...which they sort of are but we couldnt not really sum any channel signal via that route. Ill have a look at the patch bay drawings tomorrow and look for some FOH.
Thanks ever so for your interest.
sebastian747
VU Meter Specialist
 
Posts: 28
Joined: Tue Jun 01, 2010 2:06 am
Location: Bath England

Re: ROYAL OPERA HOUSE CALREC REFURB

Postby sebastian747 » Thu Jul 08, 2010 7:34 am

OK chaps so here are some pictures of the flow diagrams, The main drawing i have had to split into 3 parts as its on A0 paper.
Maybe these shed some light? Is there a Stereo mix bus? can the Pan be used on the channel and the group outs? ...what the heck is Tone to Talkback...and what is SG ( sub group i assume) but who knows? SORRY THEY LOOK SO BIG :roll:
Attachments
IMG_2840.jpg
IMG_2841.jpg
IMG_2842.jpg
IMG_2839.jpg
MAYBE OF USE??
sebastian747
VU Meter Specialist
 
Posts: 28
Joined: Tue Jun 01, 2010 2:06 am
Location: Bath England

Re: ROYAL OPERA HOUSE CALREC REFURB

Postby Matt Syson » Thu Jul 08, 2010 8:08 am

Hi
Good try but to really answer the questions I am afraid we need better resolution so it can be read easily.
Tone to talkback is a method of applying tone to all theoitputs that talkback can be selected to. This would be used to check amplifier line up and help locate faulty speakers. It is a fair walk around the ROH!
I have not seen a stereo bus as such but as I said earlier you can happily relable something else, last 2 groups or whichever.
There are a few bits of circuit left in the rack cards in the rear so you could probably 'make' a stereo bus with the spare bits!
Best regards
Matt
Matt Syson
Engineer
 
Posts: 1028
Joined: Sun Oct 08, 2006 6:04 am
Location: North UK

Re: ROYAL OPERA HOUSE CALREC REFURB

Postby sebastian747 » Thu Jul 08, 2010 8:26 am

Can you PM me your email address, i cant upload any bigger than that the server..... he say NO? thanks Matt
sebastian747
VU Meter Specialist
 
Posts: 28
Joined: Tue Jun 01, 2010 2:06 am
Location: Bath England

PreviousNext

Return to Calrec Recording Consoles

Who is online

Users browsing this forum: No registered users and 2 guests

 
Mr Patchbay sells patchbays, tt/bantam cables and more