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Old 10th March 2010, 01:48 AM   #1
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Default Highly recommended German Amplifier Schematic !

MB* 7008 amplifier module !
I received from Mr.David Louis (Audiogon)

High voltage Opamp and Darlington Transistor Output.


Thanks
Anadigit
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Old 10th March 2010, 01:55 AM   #2
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Default Module

A module of an amplifier (dual mono in 1 chassis)
Its sound like tube but very punchy more than my ARC VT-60

Thanks
Anadigit
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Old 10th March 2010, 02:30 AM   #3
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Default Berendsen

Quote:
Originally Posted by ANADIGIT View Post
MB* 7008 amplifier module !
I received from Mr.David Louis (Audiogon)

High voltage Opamp and Darlington Transistor Output.


Thanks
Anadigit
Hi,

This schematic reminds me of a Berendsen mono amp that I had for service ones.
The Berendsen was balanced out but the schematic of one half of it looks very much like this schematic.
Do you have more information about this amp?

Best regards,

Audiofanatic
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Old 10th March 2010, 03:52 AM   #4
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This new masterpiece from MB* fulfils the wishes of all the music lovers who want a com-pact and elegant audio reproduction system without any compromise in sound quality.

The power section of the mb* 7008 is designed with a double-mono construction, using 2 separate power boards. For optimal operation, the heatsink is on the top - this design creates the shortest signal path and the most homogenous temperature field for lowest thermal distortion. You will be surprised by the control of the power amplifier stage and you will feel that you have virtually limitless amounts of power available. The second surprise will be the total lack of coloration of the unit - what's left is only the beauty of the music. This is one of the rare amplifier designs where a solid-state amplifier is able to reproduce extremely difficult instruments with pure fidelity, without introducing distortion.

120W Rated Power :
Output Voltage max 35 V peak
Output current max : 20 A peak
Input Impedance :
10 kW, RCA
10 kW, XLR
Input Sensitivity : 1,5V, 185 W, 4W
S/N ratio unweighted : 111 dB
S/N ratio A-weighted : 115 dB
Frequency Response :
Mono/Stereo DC - 130 kHz
Distortion : <0.006%, 4 W, 1 kHz, 50 W
Damping Factor : 300 (4W)
Power Consumption :
4 VA sleep mode
47 VA (Idle Mode)
450 VA (max.)
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Old 10th March 2010, 07:33 AM   #5
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I may be dumb but to me it looks like a mediocre opamp driving a follower. Not sure what is the advantage of the opamp rails referenced to the output.
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Old 10th March 2010, 07:40 AM   #6
cbdb is offline cbdb  Canada
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You sound like your one of their salesmen.

OPamp front ends seem like a cheat to me. Why do you want 2 output stages? (one in the OA one in the amp)
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Old 10th March 2010, 08:09 AM   #7
poynton is offline poynton  United Kingdom
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Originally Posted by cbdb View Post
You sound like your one of their salesmen..............................
I'm glad someone else feels this thread is almost a sales pitch !!

I was half expecting the price and P&P charges to have been listed by now.


Andy


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Old 10th March 2010, 08:18 AM   #8
wahab is offline wahab  Algeria
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OPA445 is a bad op amp for audio from my experience.
They are high voltage, yes, but that s all...
I still have a bunch that i got from a friend that work in a factory.
They use them to drive power op amps used in motors driving circuits...
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Old 10th March 2010, 08:24 AM   #9
grufti is offline grufti  United States
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Quote:
Originally Posted by poynton View Post
I'm glad someone else feels this thread is almost a sales pitch !!

I was half expecting the price and P&P charges to have been listed by now.


Andy


.

The amp in question has a retail price upwards of $5K - just guessing I don't know for sure and it is probably even more expensive.

When you take that into consideration do you still think that someone posting about the amp on diyaudio is a salesman? Selling what? ... the amp itself? Can't sell pcb or a kit of the design either because it is a commercial product.

This is not a bad design. There is a lot going on that is worth a closer look: the opamp rails referenced to the output for example. That explains the choice of opamp and gives it a different twist.

Last edited by grufti; 10th March 2010 at 08:28 AM. Reason: added more of an explanation
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Old 10th March 2010, 09:11 AM   #10
wahab is offline wahab  Algeria
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Originally Posted by grufti View Post
The amp in question has a retail price upwards of $5K - just guessing I don't know for sure and it is probably even more expensive.

This is not a bad design. .
5000$ ?......
It doesn t worth that sum..
It use old dirt cheap darlingtons BDV64/65.
A minimum would be to use superior Sanken devices, but i suppose
that the profit return ratio was the most studied equation when
designing this amp....
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