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Related Manuals for Octave MRE 220 SE
Summary of Contents for Octave MRE 220 SE
- Page 1 MRE 220 SE Owner's Manual English...
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Page 2: Introduction
10 years ago. These advances have been achieved through the application of the latest technological developments as they become available and affordable. OCTAVE has specialized in tube amplification for the past 30 years, during which time we have developed a number of innovative technologies that have earned us a reputation as one of the leaders in the field. -
Page 4: Table Of Contents
CONTENTS Page Introduction ......................Description of the MRE 220 SE ................Safety instructions ....................Before you begin ....................Placement ......................Warranty ......................... Getting started ......................Unpacking, package contents ................Removing the grille ....................Installing the power tubes ..................Switching on for the first time: the soft-start feature .......... -
Page 5: Description Of The Mre 220 Se
MRE 220 is rock solid. Now, again 10 years later - the next step: The MRE 220 becomes the MRE 220 SE. Many new loudspeaker concepts with high resolution in the midrange and the triumph of high-resolution digital formats lead to an unprecedented quality of playback. - Page 6 W Idle current. Therefore, the unit produces no heat while it remains switched on. When a music signal is once again detected by the MRE 220 SE, the Ecomode circuit will power the unit back on, with a short warm-up/start-up delay (approximately 20 - 30 seconds) before the unit will operate.
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Page 7: Safety Instructions
2. SAFETY INSTRUCTIONS 2.1. Before you begin Before using the MRE 220 SE for the first time, remove the grille and install the power tubes! (See Section 3.2 "Removing the grille"). Replace the grille before switching the MRE 220 SE on. -
Page 8: Placement
2.2. Placement 1. Location OCTAVE equipment is designed strictly for use in a dry domestic environment. Do not use it in the open air or in damp environments! Never place plants or liquid-filled containers on your OCTAVE equipment. Take care to avoid dropping objects or spilling liquids into the case. -
Page 9: Getting Started
3. GETTING STARTED 3.1. Unpack and check the contents of the box. Scope of delivery 2 pc MRE 220 SE 2 set power tubes packed separately with tube layout diagram Power cord 4.0 x 100 flat-bladed screwdriver for adjusting the bias Owner's manual with certificate 3.2. -
Page 10: Switching On For The First Time: The Soft-Start Feature
Procedure Connect the MRE 220 SE to the mains. Switch on the MRE 220 SE using the amplifier’s mains power on/off switch (see chapter 4 front panel ).The Power-LED... -
Page 11: Connecting The Unit
3.6. Connecting other components to the MRE 220 SE Procedure Make sure that the MRE 220 SE is switched off! Connect the other components in your system to the appropriate sockets on the rear of the MRE 220 SE. (See chapter 5 "Rear panel connections"). -
Page 12: Front Panel Controls
To ensure the accuracy of any adjustment, switch On the Muting function NOTE: The MRE 220 SE is equipped with a Soft-Start circuit and a Power-Up delay timer. The amplifier is ready for use after a delay of approximately 45 seconds. Because there are no relays in the signal path, a low-level, slightly distorted signal from your source equipment may be heard through your loudspeakers during warm-up. -
Page 13: Rear Panel Connections
Black-Box-Connector The (Super) Black Box is an outboard power supply capacitance upgrade for the power amplifier section (see chapter 8). You must switch off the MRE 220 SE using the power switch before connecting and disconnecting the Black Box! - Page 14 5. REAR PANEL CONNECTIONS Legend Power Selector Sliding switch to adjust the output power of the MRE 220 SE depending on the Output Tubes. (See chapter 6.1) Model identification plate Model and Serial Number IEC socket with integrated fuse holder.
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Page 15: Advanced Functions
The Power Selector allows adjusting the MRE 220 SE in accordance to the output tubes. Position HIGH is reserved for KT 120 / KT 150 / KT 170 tubes. In the HIGH Position the MRE 220 SE is able to deliver up to 220 W RMS Output Power. The slightly weaker tubes type KT 88 or 6550 can be used in the position LOW. -
Page 16: Electronic Protection System
The BIAS LEDs will show "yellow" for each of the four output tubes. If a Black Box or a Super Black Box is connected to the MRE 220 SE, the front panel (operate) LED of the Black Box / Super Black Box will go out. If the Super Black Box is connected, tripping the protection system will automatically activate the discharge circuit of the Super Black Box (see chapter 8.2). -
Page 17: Ecomode (Power Saving Mode)
Note: If you switch the MRE 220 SE on with Ecomode active, it will go through the start procedure. If it fails to detect a music signal, it will shut down after approximately 10 minutes. Ecomode is not the same as standby, however, because certain sections of the amplifier remain on. -
Page 18: Setting Of The Damping Factor
6. ADVANCED FUNCTIONS 6.6. Setting the damping factor Attention: before switching the damping factor, please switch off the MRE 220 SE with the power switch Procedure It is best to do the switchover with two people: Raise the power amplifier at the front (lift the front by approx. 15 cm) and fix the device in this position The switching of the damping factor is accessible through the base plate. -
Page 19: Electronic Xlr-Input
RCA Input. This is helpful in cases you have only a balanced signal connection to the preamp. Driving the MRE 220 SE via RCA with a preamplifier’ s Output Impedance of more than 500 ohms the sound of the MRE 220 SE can degrade. -
Page 20: Tubes
ECC802 (= ECC 82,12 AU 7, 5814, 6189) V 6 should have a system Gain match close to 0.5dB Compatibility Power Tubes Model EL34 6550 KT88 KT120 KT150 KT170 MRE 220 SE +LOW +LOW +LOW +HIGH +HIGH +HIGH May be used May not be used... -
Page 21: Bias Measurement Facility
That is why we have built this BIAS measurement facility into the MRE 220 SE – to allow you, the user, to carry out the adjustment yourself without the need for test equipment. The use of precision op amps makes it possible for you to set the BIAS to accuracy within 0.2%, making it superior to any... - Page 22 7. TUBES How to set the BIAS Make sure that no signal is playing through the amplifier when you are adjusting the BIAS. It is sufficient to turn your preamp volume control to 0, or you switch on the Muting; there is no need to disconnect the speakers.
- Page 23 7. TUBES LED graphs, advanced adjustments of the BIAS setting There is an upper adjustment limit to the "high" BIAS setting, which is indicated by the green and yellow + LEDs lighting up at the same time, and a lower limit to the "low setting, where the yellow - and green LEDs light up.
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Page 24: Replacing The Tubes
7.5. Breaking in All OCTAVE equipment is subject to a 48-hour performance test at the factory to break in the tubes. The tubes are preselected for use in each particular model. New tubes can take up to three months to break in and start sounding their best. -
Page 25: Option (Super) Black Box
With the Black Box technology OCTAVE offers an instrument for optimizing the OCTAVE amplifier in respect to the speaker. This flexibility is a unique feature of the OCTAVE brand. The dynamic and tonal stability of an amplifier is strongly dependent upon the stability and capacity of the power supply, therefore the Black Box and Super Black Box were developed as external upgrades to the OCTAVE amplifiers’... -
Page 26: The Super Black Box Option
The yellow "unload" LED (discharge control circuit) illuminates for approximately two seconds after switch-off, and also when the electronic protection is activated and when the MRE 220 SE is powered down with Ecomode on. The Super Black Box is equipped ... -
Page 27: Troubleshooting
Although the MRE 220 SE is earthed, its signal ground is a "floating" ground, which means that the MRE 220 SE cannot itself create ground loops. Hum can only be caused when it is connected to other items of equipment. -
Page 28: Specifications And Dimensions
10. SPECIFICATIONS AND DIMENSIONS Power Amplifier MRE 220 SE Configuration: push pull pentode circuit, class A/B; negative grid voltage adjustable separate for each power tube through ten turn precision regulators. Special wideband output transformer using high efficient PMZ core. Power Selector High:... - Page 29 10. SPECIFICATIONS AND DIMENSIONS Dimensions: ca. 498 mm with Black Box connector Diagram THD at 4 V into 4 ohms from 30 Hz to 20 kHz at a variety of BIAS settings Diagramm 1 Curve 1: BIAS adjusted correctly Curve 2: BIAS 10 % out Curve 3: BIAS 30 % out...
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Page 30: Frequently Asked Questions (Faq)
Can you operate the MRE 220 SE when no loudspeakers are connected? Yes. The MRE 220 SE, like all OCTAVE amplifiers, is fully protected against open circuit operation, i.e. the amplifier will come to no harm if it is operated without loudspeakers connected and the input level is in the magnitude of normal listening levels. - Page 31 We reserve the right to alter and improve the specifications in pursuit of better. OCTAVE logo is a registered trade mark of Andreas Hofmann. Copyright by Andreas Hofmann OCTAVE AUDIO T. +49 (0) 7248 3278 ANDREAS HOFMANN F. +49 (0) 7248 3279 REUTAECKERSTR.
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