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Summary of Contents for Octave V 70 Class A
- Page 1 V 70 Class A 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 V 70 Class A ..............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 6: Description Of The V 70 Class A
Of course, Andreas Hofmann was tempted to combine both concepts into something new. The result of many years of development is a typical Octave amplifier, the V 70 Class A, a Class A push-pull amplifier in a pentode circuit. -
Page 7: Safety Instructions
2.1 Before you begin Before using the V 70 Class A for the first time, remove the grille and install the power tubes! (See Section 3.2 „Removing the grille"). Mount the grille again before switching ON the V 70 Class A. -
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 Unpacking, package contents Scope of delivery V 70 Class A 1 set power tubes with tube layout diagram Power cord (3-core cable with 3-pin plug) Remote control 1 x 2,5 mm Allen key for removing the cover ... -
Page 10: Installing The Power Tubes
Ecomode Check that the Ecomode switch on the rear panel is in the "Eco off" position Connect the V 70 Class A to the mains. (On new units, this ECOMODE switch is set to "off" at the factory) ... -
Page 11: Checking The Power Tubes (Bias)
3.5 Checking the power tubes (BIAS) The V 70 Class A has an auto-bias device, which means that you no longer have to adjust the quiescent current of the tubes yourself. The four power tubes adjust themselves to the correct qui- escent current (BIAS) due to the Class A circuit concept. -
Page 12: Connection Options: Overview
3. GETTING STARTED 3.7 Connection options: overview... -
Page 13: Front Panel Controls
Pos. 6: The electronic BIAS measurement system is activated (see chap. 7.3). Pos. 7: Front Ch. Multichannel input. In this mode, the V 70 Class A functions as a two-channel power amplifier. The volume control is bypassed. (See chap. 6.5) The record output is switched off in this position ... - Page 14 4. FRONT PANEL CONTROLS Legend BIAS adjustment LED display of the quiescent current of the output tubes V3 and V4 Remote control receiver To ensure optimum operation of the IR remote control, do not cover this window Status indicators Indicates that the unit is switched on.
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Page 15: Rear Panel Connections
(see chapter 6.5). Regulated preamp output for active subwoofer, etc. (see chapter 6.6.). Pre Out CD 2 CD balanced line level input, XLR. Sliding switch to adjust the output power of the V 70 Class A. Power Selector (see chapter 6.1) - Page 16 The (Super) Black Box is an outboard power supply connector capacitance upgrade for the power amplifier section (see chapter 10). You must switch off the V 70 Class A using the power switch before connecting and disconnecting the Black Box! AC supply socket IEC socket with integrated fuse holder.
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Page 17: Advanced Functions
The Power Selector allows adjusting the V 70 Class A in accordance to the output tubes. Position HIGH is reserved for the standard KT 120 tubes. In the HIGH Position the V 70 Class A is able to deliver up to 2 x 50 W RMS Output Power. The slightly weaker tubes type KT 88 or 6550 can be used in the position LOW. -
Page 18: Protection
A fault in one of the preamp tubes which overloads the affected channel. Once the protection system has cut in, the only way you can turn the V 70 Class A back on, is to turn the on/off switch off and then on again. Allow the unit two minutes to cool down before switching it back on. -
Page 19: Ecomode
The Ecomode serves to reduce heat and unnecessary power consumption when the unit is switched on but not in use. After 10 minutes without receiving signal, the V 70 Class A Ecomode is activated, turning down the power. In this “sleep” mode, the V 70 Class A draws less than 20 W Idle current. -
Page 20: Front Channel
“Front Channel” selector position, the V 70 Class A functions as a stereo amplifier. The overall Gain of the V 70 Class A is reduced to 20dB in this position. The signal of the front channel input is not available on the record output. -
Page 21: Tubes
Note: Some tubes will fit into the sockets but will still not work with the V 70 Class A – such as the EL 509 / 519, for example. Low Power tubes like 6L6, KT 66 or 5881 are not recommended. -
Page 22: Bias Control Display
Therefore, a BIAS measuring device was integrated in the V 70 Class A, which enables the user to check the BIAS of the four power tubes. The BIAS is shown with three colored LEDs, yellow for quiescent current too low, green for correct quiescent current and red for quiescent current too high. -
Page 23: Replacing The Tubes
You should check these tubes after about 20 minutes 7.5 Running in the tubes All OCTAVE equipment is subject to a 48-hour Long-term quality test at the factory to burn in the tubes. The tubes are preselected for use in each particular model. -
Page 24: Remote Control
9. OPTION PHONO MC/MM A MM or MC Phono board is available as an option for the V 70 Class A. This additional board is connected internally to the AUX 2 input. When the board is installed, this input can no longer be used as a line level input. -
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: Option Super Black Box
10. OPTION (SUPER) BLACK BOX 10.2 Option Super Black Box Legend Blue power LED The blue “power” LED illuminates when the power amplifier is switched on via the amplifier’s power on/off switch. Yellow unload LED The yellow “unload” LED (discharge control circuit) lights up for ap- proximately 2 seconds after switch-off, in case the electronic protec- tion is activated and if the amp is powered down through the Eco- mode. -
Page 27: Troubleshooting
Although the V 70 Class A is grounded, its signal ground is a "floating" ground, which means that the V 70 Class A cannot itself create ground loops. Hum can only be caused when it is connected to other items of equipment. - Page 28 To reduce this kind of interference, move the transformer/component or the affected component/cable to a different location. The transformer in the V 70 Class A will not generate interference, as it is electromagnetically shielded and has a very low stray field.
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Page 29: Faults Caused By Tubes
11. TROUBLESHOOTING 11.2 Faults caused by tubes Like other OCTAVE products, the V 70 Class A is equipped with a double safety system. This means that the amplifier will be protected from damage if a component (tube) should fail and trip the electronic protection. - Page 30 "front" the particular tube is, the more it will tend to make itself felt. In the V 70 Class A, this would be tube V 5. As it is rare for both systems in a double triode to be equally affected, the noise levels in each stereo channel will be different.
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Page 31: Specifications And Dimensions
12. SPECIFICATIONS AND DIMENSIONS Output Configuration: Push Pull, advanced Pentode Mode, Grid 2 Voltage 340 V. Wideband Output Transformers using Silicon steel PMX Core, single Impedance Output. Optimum Load Impedance 4 - 16 ohms. Amplifier remains stable with No Load. In- and Outputs 6 x Cinch (including one HT Bypass input) Inputs... - Page 32 12. SPECIFICATIONS AND DIMENSIONS General data Start-up time 50 sec. 500 W at full power Power consumption 190 W idle 20 W in Ecomode Inrush current limitation to 600 W for 0.3 sec 23 kg Weight 230/240V: 4 A slow-blow H (T4AH- size 5 x 20 mm). Mains fuse 115/240V: 6.3 A slow-blow H (T6.3AH size 5 x 20 mm).
- Page 33 5 V / 4 Ohm The frequency response curve clearly shows the low frequency extension of the V 70 Class A linear to 10 Hz The loss at 20 Hz is less than 0,2 dB Graph 2: Noise spectrum A-A FFT SPECTRUM ANALYSIS V110SE 5V / 4Ohm Noise spectrum at 1 kHz / 5 W into 4 ohms –...
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Page 34: Frequently Asked Questions (Faq)
Does the V 70 Class A have to have all of its tubes fitted? In principle, the V 70 Class A will also operate without tubes. It is sometimes useful to do this when testing the operation of the switching functions such as the selector switch, remote control, etc. - Page 35 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. OCTAVE AUDIO Germany www.octave.de...
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