background image

 

 

 
 
 
 

 

 

16 

7. TUBES 

 
 

7.1. REMOVING THE GRILLE 

 

 

 

To remove the grille: 
 
 

1.  For your own safety, switch the amplifier off using the on/off switch. 

 

2.  Release the two M4 socket head bolts on the right and left of the grille.(Scope of delivery 

includes an allen wrench) 

 

3.   Pull the grille upward to remove. (The nuts that these bolts screw into are the captive type. 

They will not fall into the casing when fully unscrewed.)  

 

 

7.2. TUBE LAYOUT 

 

 

 
 

 
 
 
 
 
 

 
 

 

Output tubes:  V1 - V4: 

6550 fitted as standard  

 

 

 

 

Possible alternatives are KT88, 6L6, and KT66 

  V1 

V2 

 left 

channel 

  V3 

V4 

 right 

channel 

 
Driver tubes: 

V5 

 

ECC83  (E83CC)  

= input tubes 

 

 

V6 

 

ECC88  (E88CC, 6922) = driver tubes 

 

 

 

 

both channels use the V5 and V6 output driver tubes 

Summary of Contents for V70

Page 1: ...V 70...

Page 2: ...ircuit designs has not done the technology any favours Today s loudspeakers and source equipment provide better performance than ever before but also make greater demands on amplifiers Modern sound re...

Page 3: ...front panel 12 5 The BIAS measurement system 14 6 Connections V70 rear panel 15 7 Tubes 7 1 Removing the grille 16 7 2 Tube layout 16 7 3 Tube service life 17 7 4 Replacing tubes 17 8 Programmable re...

Page 4: ...ubilee monoblocs this technology is particularly beneficial to the sound quality of smaller amplifiers Inter action of the power amplifier with the sensitive input stages is elimi nated The sound gain...

Page 5: ...e as possible etc This is certainly important advice for many amplifier brands but is not neces sary with the V 70 The built in control system automatically takes care of this PROTECTION SYSTEM Anothe...

Page 6: ...y a qualified technician Fuses should also only be changed by a qualified technician Always replace fuses with ones of the same type and rating If your amplifier requires servicing please ship or take...

Page 7: ...e the unit near flammable materials gases or vapours Avoid areas where there may be heavy accumulations of dust or where the unit may be subject to mechanical vibration Place your OCTAVE amplifier on...

Page 8: ...ng the power cable to the wall socket Before connecting the optional outboard Black Box ensure that it is switched off see Chapter 9 Black Box 6 Now switch the amplifier on using the power on off swit...

Page 9: ...he display to show which source is active CD Line level input for CD Tuner Line level input for tuner Phono Line level input for external phono module Aux Additional line level input for video etc Tap...

Page 10: ...Bias yellow LED Lights up when the bias measurement facility is switched on see and Chapter 5 BIAS Wait yellow LED Lights up during the soft start process immediately after switch on This LED goes ou...

Page 11: ...racy of 0 3 making it superior to any other ad justment method The use of selected output tubes only makes sense if the idle current is adjusted accurately as is clearly shown in Fig 1 Technical Data...

Page 12: ...el input for video etc TAPE REC Output for a tape or DAT machine TAPE PLAY Output for a tape or DAT machine Pre out Regulated preamp output for active subwoofer and so on Loudspeaker outputs Speaker c...

Page 13: ...n allen wrench 3 Pull the grille upward to remove The nuts that these bolts screw into are the captive type They will not fall into the casing when fully unscrewed 7 2 TUBE LAYOUT Output tubes V1 V4 6...

Page 14: ...ones 2 Before you switch the amplifier back on turn all bias adjustment controls counterclockwise this reduces the anode current substantially You will hear a click when the controls reach the minimum...

Page 15: ...re developed as external upgrades to the OCTAVE amplifiers power supply storage capacitors by increasing their capaci tance by a factor of 4 Black Box or 10 Super Black Box respectively This is a trem...

Page 16: ...Connecting to the amplifier Warning Before connecting the Black Box switch the unit off using the power switch and wait for 1 minute When inserting the connector guide the anti rotation lug carefully...

Page 17: ...lluminates for about 2 sec onds This indicates that the rapid discharge circuit is discharging the electrolytics in the SBB The discharge circuit also activates if the SBB connecting cable is removed...

Page 18: ...cause cracking through the loudspeakers when they switch on and off Solution The only solution is to use a single power socket board for your entire system and to use a different power outlet in your...

Page 19: ...uency response 10 Hz 80 kHz 0 5 dB Total harmonic distortion 0 1 at 10 W into 4 ohms Signal to noise ratio 100 dB Minimum load impedance 2 ohms Input sensitivity 120 mV normal gain 700 mV low gain Gen...

Page 20: ...grade Modular aluminium case Available in a range of anodized colours Distortion at 4V into 6 ohms between 30 Hz and 20 kHz at a variety of bias settings Diagramm 1 Curve 1 Bias adjusted correctly Cur...

Page 21: ...Tubes normally sound the same throughout their service life and our soft start technology contributes greatly to extending the service life of tubes You can tell when an output tube has reached the e...

Page 22: ...ality there is no need to use special cables with tube amplifiers Speaker cable can exhibit high values of capacitance and inductance and tube amplifiers are better able to deal with these characteris...

Page 23: ...de 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 pa...

Reviews: