DDA consoles

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DDA consoles

Postby brianroth » Thu May 31, 2007 10:53 am

I wonder if there is enough interest in DDA desks to warrant a new board section?

I currently maintain a Profile and a DCM-224V for two clients, plus do some communications with a few folks re. other DDA desks. I guess I am seeking to "band together" with otherrs who own/maintain these machines.

Bri
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dda

Postby sigma » Tue Jun 05, 2007 2:33 am

Hi Brian,

I´m new in this forum i have a dda dcm 232 myself and must say there are very few of these desks around so im sure that everyone who have one of these would be more than pleased to have a board section.

I just had some big troubles with my bargraph PSU the toroidal blowed up and i´m quite sure that i have to change it in the audio PSU as well but i have no idea about the values of the secondary winding or the VA Rating on this unit????.

Also on my control room module the right side of the main monitor output are making really weird noises i think it might be a OP-Amp blown.

Brian do you know if there is somewhere to get spare modules for this thing as it is indeed a great console when working.

Thanks
Martin
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Postby brianroth » Tue Jun 05, 2007 2:51 am

Hello, Martin, Funny you should mention the bargraphs since I spent a bunch of hours "reverse engineering" the logic boards of those! I did have schematics (Midas/Telex tech support has been WONDERFUL!) but it was a hair puller.

Odd that the torroid blew up in your PSU, but I guess anything is possible. I just looked at the schematic and there is no useful info regarding the winding voltages, etc.

Unfortunately, the 224V desk is almost 800 miles away from me, so I can't take actual field measurements. Maybe the Good Guys at Midas/Telex in Burnsville MN have that info?

Another possibility is to jettison the OEM supply and build up something from Power-One, etc. "open frame linear" modules.

The CR module is relatively "vanilla", although I recall the 224V's CR module did NOT use IC sockets, making repairs a tad more difficult.

Bri
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Postby sigma » Tue Jun 05, 2007 3:36 am

Wow this place is Fast:-)

Thanks a lot Brian for such a fast reply,

I just ordered a used tesded controler board for the audio PSU from Telex Germany because a 1ohm resistor blew up all the time.
The problem by the Torroid for the audio PSU is still available from telex in a new version but they want 250 Pounds for which is insane for a Torroid i paid 80 pounds for a custom trafo with 375 VA and 10 secondary windings for the Bargraph suply and want that company to make the Torroid for the audio PSU as well.
I have been thinking about changing the 4 big capacitors as well they dont really look bad but it look like they where a bit dryed in like an old apple or so would this help for the hum as well?

Brian do you agree that it could be the OP amps in the control module that causes the trouble in the monitor section?

Thanks Martin
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Postby brianroth » Tue Jun 05, 2007 12:03 pm

What sort of "weird noises" are you experiencing?

Opamps are a likely culprit....

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Postby GJC Designs » Tue Jun 05, 2007 2:36 pm

Hello Martin,

Whereabouts are you based? The reason I ask is that there is a company in Wales that I use for custom toroidal transformers. Their prices are good, and their products are excellent. About 18 months ago I had to have a Soundtracs transformer re-wound. There were NO specs to be found anywhere.... not even the manual, and as with your DDA replacement, Soundtract wanted silly-money. The transformer guys reverse-engineered the dead trafo and made a new one. It was a mighty 1-point-something kVA beast (and about 8kg in weight) with something like 6 secondaries. The price was just under £100 and the turn round was less than a week. If it's of interest, I'll pass on the details. Any good transformer maker should be able to do that same type of work. Price will vary, though, possibly as a function of "hassle factor".



Hello Brian,

I have done bits & pieces on various of the DDA desks (AMR24, DCM232, Profile, D-Series) whilst contracting to an equipment broker, but the repairs are few & far between - they seem to be very reliable. It's a good idea to have a DDA section added to this forum. How about making it a DDA & Audient section?
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Postby brianroth » Tue Jun 05, 2007 10:38 pm

Hello, Gareth! The owner of this website has just opened a new DDA section, and I volunteered to moderate it. Audient would be a logical extension of that new forum, and perhaps even Midas..

Bri
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Re:

Postby andychamp » Fri Apr 24, 2009 11:37 am

brianroth wrote:Hello, Gareth! The owner of this website has just opened a new DDA section, and I volunteered to moderate it. Audient would be a logical extension of that new forum, and perhaps even Midas..

Bri


1st of all: hi everyone! This is my first post here.

I know I may be 2 yrs. late, but: where can this DDA-specific forum be found?

Thanks!
André
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Re: DDA consoles

Postby crunch » Fri Apr 24, 2009 7:17 pm

You're in it. We filed it under "Everything Else"...


And welcome!
crunch

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Re: DDA consoles

Postby james folkes » Wed Jul 29, 2009 7:58 am

hello everyone, first post here.

i've recently joined the analog console club with another of dearsden davies associates finest, that being a dda qii monitor. actually i have owned a little seck 12-8-2 for many years (and very happy it makes me too) although it's always worked very well and i've never had need to seek much advice about it, perhaps that's why i've never found myself here before.

actually i have two seck desks from the pre-soundcraft purchase era (you can daisy chain them when you start running out of channels!), perhaps some members might get misty eyed when seeing them and remember having fun with them back in the 80s. here's a snapshot of mine...

Image

and the ickle one...

Image

the power supply for the bigger one is in this second picture, well if you need phantom power on the little one you need to use this psu too, but yeah, those are my little secks. lots of people get all excited when they see them out and about, apparently they were used lots in the early days of acid house because when you feed them a fat signal and get it nice and irey on the eq circuits, they take on a really pleasing growl...

but i digress.

i reckon this qii that i bought was a bargain, over the last few years a few switches have gone astray here and there, and then the power supply went foom in the middle of a gig last summer. the previous owners never got it fixed and hence i got a flight cased, 32 input, stereo sub-group version for the princely sum of a tenner a channel... it's going to need a few bits and bats to get it back to former glory, is there anywhere that uk members of the forum would recommend? i think i need at least a dozen mode switches, probably the odd pot too. it's highly likely i will need some advice and the occasional prod in the right direction on this little restoration project too, for which i thank you in anticipation.

i'll keep you posted on progress.

james.
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