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stephane RAME
12-09-2010, 04:05 AM
Hi,
My new amplifier for my system
http://www.audioheritage.org/vbulletin/showthread.php?29600-Altec-AcoustaBass-AB-2200-JBL-3732mhf-JBL-2402h

2 amplifier Dynaudio Acoustics DCA 450 - 2x250w-8ohms
http://www.mc2-audio.co.uk/mc450/

Good sound :):):)

Stéphane

caladois
12-09-2010, 07:08 AM
Very nice looking. Enjoy !

cooky1257
12-10-2010, 01:26 AM
Nice find. If you are lucky and the fans are quiet you'll enjoy these amps very much.
They sound excellent(I use the MC1250 and an MC650) and are very well built/over specified.
Cooky

stephane RAME
12-10-2010, 03:55 AM
Hi
The fans are disconnected to be silent
Stéphane

cooky1257
12-10-2010, 07:12 AM
..then you may want to read this thread on a uk hifi forum about possible consequences( from post 45 onwards I think);http://www.zerogain.com/forum/showthread.php?t=18411&highlight=MC1250

stephane RAME
12-13-2010, 03:44 AM
Hi,
Thank you for reading.
The seller was already using with the fans unplugged.
Stéphane

http://www.audioheritage.org/vbulletin/showthread.php?11750-My-new-Loudspeaker-Systems-%E2%80%93-Great-Plains-audio
http://www.audioheritage.org/vbulletin/showthread.php?29600-Altec-AcoustaBass-AB-2200-JBL-3732mhf-JBL-2402h

stephane RAME
08-12-2011, 12:42 AM
Hi,
I just changed the fan on my amplifiers.
The model chosen is the Noctua NF-R8 rotating at 800 revolutions / minute
The result is very quiet

Stéphane

524295243052431

stephane RAME
08-18-2011, 09:08 AM
Hi,
The third copy arrived.
I have the same good sound on all speakers.

Stéphane

52530

caladois
08-18-2011, 10:58 AM
Superb !

karawaci
09-23-2011, 07:18 AM
[QUOTE=stephane RAME;318424]Hi,
I just changed the fan on my amplifiers.
The model chosen is the Noctua NF-R8 rotating at 800 revolutions / minute
The result is very quiet

Stéphane

Hello,

Best upgrading !

But...
Have you the electronic schematic about this amplifier DCA 450 ?

Many thanks

Pierre

stephane RAME
09-23-2011, 09:19 AM
Hi,
Yes, really less noise.
No, I do not have the electronic schematic of this amplifier.
This summer I also change all the capacitors.
http://srsystemaudio.blogspot.com/2011/08/dynaudio-acoustics-dca-450-mc2-audio-mc_26.html

Stéphane

stephane RAME
10-14-2011, 10:29 AM
The power supply schematics MC 450-650-750

5325753258

Stéphane

stephane RAME
12-15-2011, 10:45 AM
54069

Hi,
The family has increased over a model MC1250.:D
The model of Franck (cooky1257).:)
Big sound.:applaud:

Stéphane

stephane RAME
12-18-2011, 10:29 PM
54128

For more space, I just installed all the amplifiers in the attic above my listening room.
More fan noise.
The active filter EV DX46 was placed with the amplifiers, I command by the network.

Stéphane

stephane RAME
03-31-2012, 11:33 AM
55270

Hi,
A hum appeared on the left channel of the MC1250, after some tests to verify that this does not come from a ground loop, I decided to changed.
This amplifier is built in 1998 in the design life of capacitors.
After opening the cover, a problem arises capacitors (15000uF/120v) used are not easily discoverable standards and unable to change size.
Good news, these models are sold by MC2 for repairing.

Stéphane

stephane RAME
02-21-2014, 08:18 AM
News
http://1.bp.blogspot.com/-WqsrdNjI8Ko/UwdwrHoK2SI/AAAAAAAADJA/_vFXV7mUp_k/s1600/P1050357.JPG

Stéphane

NickH
02-21-2014, 08:50 AM
Stephane, If you could find caps with a slightly higher voltage rating they would work. Say 150vdc. And a slight increase in capacitance wont hurt either.


But a those capacitor are trash.

pos
02-21-2014, 09:24 AM
News
http://1.bp.blogspot.com/-WqsrdNjI8Ko/UwdwrHoK2SI/AAAAAAAADJA/_vFXV7mUp_k/s1600/P1050357.JPG

Stéphane

One MC1250 channel per 15" woofer, and 1 MC450 channel per compression! Nice!
What is the nominal impedance of your woofers?

stephane RAME
02-21-2014, 09:33 AM
One MC1250 channel per 15" woofer, and 1 MC450 channel per compression! Nice!

Yes
http://www.audioheritage.org/vbulletin/showthread.php?35331-News-speakers-FD-Audio-SR-D402


What is the nominal impedance of your woofers?
No measure

Stéphane