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Old 1st March 2005, 04:19 PM   #1
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Default Classé DR-9 amplifier

Hello Everybody!

I would like to see some pictures about the inside construction of the classical Classé DR-9 amplifier.
I would appriciate, if somebody have an internal picture, and can post it here.
For me is mainly interested, how the emitter resistors are connected to transistors, but, of course, the whole interior also.

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Old 21st March 2005, 02:50 PM   #2
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It seems, nobody have an internal picture about this great classic amplifier...
I am disappointed...
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Old 21st March 2005, 04:14 PM   #3
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Why the DR9?
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Old 22nd March 2005, 06:47 AM   #4
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I gathering information, because I would like to build one later on, to compare with my Aleph amplifier.
I just want to see the phisical layout, and for this a picture is just enough to decide to go or not to go.
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Old 10th November 2005, 10:09 AM   #5
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What is the class of DR-9 and DR-3 amplifiers?
Are they Class A amplifiers or not?
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Old 10th November 2005, 11:55 AM   #6
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Depends on the one you ask.

The DR9 has 6 MJ15003/4's in parallel per rail, at 100mA bias each.
Makes it class A up to 1.2 amps, nearly 6 watts in 8 Ohm.
The DR3 VHC has 4 in parallel, MJ11015/16's.
Class A, yes. Full class A, no.

The DR9 employs a CRC powersupply, 60.000uF per rail.
With 250 watt MJ15024/25, proper heatsinking, and increased capacitor size to +200.000uF/channel it could run full class A on the 58VDC rails.
But then you are talking nearly 1000 watts dissipation.
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Old 10th November 2005, 03:07 PM   #7
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Thnks for the infos...
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Old 10th November 2005, 03:17 PM   #8
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Quote:
Originally posted by jacco vermeulen
Why the DR9?
I found the DR9 enough robust to build.
Basically, I do not know the specifications of those amplifiers, but like, that built for long time use..., and I have the schematic of this model.

I was thinking also on DR3 (not the VHC model) as well, the topology is the same.
OK, not decided yet fully.

By the way. Do you know the specifications of those classic amplifiers?
I would be grateful, if you could post it.

Regards,
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Old 10th November 2005, 03:28 PM   #9
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I'd have to look for the magazines with the tests of the Classé models.
From memory: DR3 VHC does 45 watts, DR9 is good for 170 W/8.

All of the older Classé models i've seen used TO3 output devices and output boards, with emitter resistors soldered on the boards.
Some models had the big resistors soldered on the bottom of the output boards, others on the top.
First international amplifier brand 20 years ago i've seen that used Philips electrolytics throughout.
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