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Octave RE 280 MK2 Manual

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RE 280 MK2

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Summary of Contents for Octave RE 280 MK2

  • Page 1 RE 280 MK2...
  • Page 2 We have specialized in tube amplification for the past 20 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. We hope you will enjoy many hours of wonderful music with your OCTAVE amplifier. Andreas Hofmann...

  • Page 3: Table Of Contents

    CONTENTS Page Introduction OCTAVE technology ................1.1. OCTAVE amps in contrast to other tube amps ........1.2. About the RE 280 MK2 Safety instructions ................2.1. Before you begin .................. 2.2. Placement .................... 2.3. Warranty....................Setting up ..................... 3.1. Connecting the amplifier ..............

  • Page 4: Octave Technology

    1.1. OCTAVE amps in contrast to other tube amplifiers Sound 1. The design goal of OCTAVE amplifiers is honest, natural sound repro- duction. The sound characteristics of an amplifier are derived from the sum of all its parts. Tubes do not themselves guarantee high quality sound.

  • Page 5: Octave Amps In Contrast To Other Tube Amps

    1. OCTAVE TECHNOLOGY 1.2. About the RE 280 MK2 The RE 280 MK2 stereo amplifier is a push-pull power amplifier in ultralinear configuration. Power output is approx.2 x 70W at 2% THD. OCTAVE power amplifiers have always set new standards in sound and reliability.

  • Page 6: Safety Instructions

    2. SAFETY INSTRUCTIONS 2.1. Before you begin Before using your RE 280 MK2, please remove the protective grille and install the output tubes supplied with your amplifier in the appropriate sockets (see Removing the Grille and Tube Layout). Replace the grille before switching on.

  • Page 7: 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 that objects do not fall or liquids are not spilled into the enclosure.

  • Page 8: Setting Up

    Before connecting the optional outboard Black Box, ensure that it is switched off. (see Chapter 8, Black Box) 6. The power switch for the RE 280 MK2 is located on the front panel (see Chapter 4, Operation) There is no muting or standby facility.

  • Page 9: Operation: Front Panel

    0. NOTE: The RE 280 MK2 is equipped with a soft-start circuit and a power-up delay timer. The amplifier is ready for use after a delay of approximately 3 minutes.

  • Page 10: Connections: Rear Panel

    The Black box and Super Black Box are outboard power supply upgrades for the power amplifier (see p. 14, 15 ). The RE 280 MK2 must be switched off using the power switch before connecting and disconnecting the Black Box! ...

  • Page 11: Bias Measurement Facility

    6. THE BIAS MEASUREMENT SYSTEM 6.1 How it works burn in Trimmer + LED Trimmer + LED Trimmer + LED Trimmer + LED for tube V1 for tube V2 for tube V3 for tube V4 BIAS-selector switch The bias measurement system The bias measurement facility makes it easy for you to check and adjust the idle current of the output tubes.

  • Page 12: Setting The Bias

    6. THE BIAS MEASUREMENT SYSTEM 6.2. Setting 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; there is no need to disconnect the speakers. Procedure: Turn the volume control on your preamp to 0.

  • Page 13: Tubes

    7. TUBES 7.1. Tube layout Output tubes: V1 - V4: 6550 or KT 88 fitted as standard Driver tubes: V5 - V7 ECC82 (E82CC, 12AU7A, 5814, 6189) 7.2. Tube service life Thanks to the protection circuits and soft start electronics, the output tubes used in your amplifier should achieve an average service life of 3 to 5 years.

  • Page 14: Removing The Grille

    7. TUBES 7.3. Removing the grille Operating the amplifier without its protective grille is dangerous and not recommended. To remove the grille: For your own safety, switch the amplifier off using the on/off switch and disconnect the power cord. Pull the grille upward to remove. 7.4.

  • Page 15: Using The Black Box Or Super Black Box

    OCTAVE, with the Black Box technology, offers an instrument to 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 16: Option: External Super Black Box

    8. USING THE (SUPER) BLACK BOX 8.2. Option: External Super Black Box  Blue Power LED: The blue Power-on LED illuminates when the power amplifier (or integrated amplifier) is switched on via the amplifier's power on/off switch.  Yellow Discharge LED: When the power amplifier is switched off, the yellow Unload LED illuminates for about 2 sec- onds.

  • Page 17: Troubleshooting

    Although the RE 280 MK2 is also grounded, it is equipped with a special technology that reliably prevents ground loops. Should an earth loop develop via a tuner or television aerial, we strongly recommend that you use a signal isolating filter on the aerial connection.

  • Page 18: Technical Data And Dimensions

    10. TECHNICAL DATA AND DIMENSIONS In- and Outputs Inputs 1 x RCA Outputs 1 x Loudspeaker output Amplifier Power output 2 x 70W / 4 ohms 10Hz - 80kHz /  0.5dB Frequency response  0.1% at 10W into 4 ohms Total harmonic distortion ...
  • Page 19 10. SPECIFICATION Distortion in % at 3W into 4 ohms between 30Hz and 20kHz at a variety of bias settings 0.05 = 0,025% 0.02 0.01 Curve 1: Bias adjusted correctly Curve 2: Bias 10% out Curve 3: Bias 30% out Frequency response Between 10Hz and 90kHz the frequency response tolerance is just 0.3dB...
  • Page 20 10. SPECIFICATION THD between 30Hz and 20kHz 0.01 0.001 0.0001 The total harmonic distortion curve is very linear, increasing only slightly at the lowest frequencies. This performance is only possible using a highly specialist output transformer.

  • Page 21: Faq

    11. FAQ Can you operate the amplifier when no loudspeakers are connected? Yes. All OCTAVE amplifiers are protected against open circuit conditions, i.e. they will not be damaged if operated with the loudspeakers disconnected. However, when connecting your loudspeakers to the amplifier, you should set the volume control on your preamp to 0 to avoid excessive output to the speakers.
  • Page 22 11. FAQ What is the idea of selectable gain in OCTAVE preamps? Speakers with rated efficiencies higher than 98dB are problematic when it comes to adjusting volume levels. As the range of adjustment is limited to the lower end of the volume control, it is difficult to adjust the volume with any precision.
  • Page 23 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. Reproduction in whole or part is prohibited. edited EN2010 OCTAVE AUDIO Germany...

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