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11. TROUBLESHOOTING 

 
 

11.1. Faults caused by external issues 

 

Buzzing and hum in the speakers 
 

 

Possible cause: multiple grounds 

 

Hum in an audio system is often caused by several system components having their own separate 
grounds.  It  is  particularly  common  in  systems  containing  tuners,  VCRs  or  satellite  receivers,  as 
these components are connected to an aerial.  Because aerials and cables are always grounded, 
ground  loops  can  form  between  the  aerial  connection  and  other  grounded  equipment.  Other 
equipment  that  is  normally  grounded  may  include  PCs  with  sound  cards,  and  some  CD/DVD 
players and DACs. 
Although the V 110 SE is grounded, its signal ground is a "floating" ground, which means that the V 
110 SE cannot itself create ground loops. Hum can only be caused when it is connected to other 
items of equipment. 
 

To fix the problem 

Before  trying  to  fix  the  problem,  find  out  which  of  your  system  components  is  responsible  for 
generating the hum. 
Procedure:   

Unplug all source equipment, including any equalizer if used, from the V 110 SE, leaving only 
the loudspeakers connected.  

Reconnect  the  components  back  to  the  V  110  SE  one  at  a  time.  As  soon  as  the  hum 
reappears, you have two grounded components connected to the V 110 SE. You must now 
unplug your components in reverse order to find out which of them is grounded. 

Usually, the hum will still appear even when the problem components are switched off. The ground 
causing the problem is always connected, since it is not broken when the power switch is operated. 
 
Now  that  you  know  which  components  are  grounded,  you  can  discuss  the  problem  with  your 
dealer. 
One option might be to use a signal-isolating filter on the aerials or cable networks. These devices 
do  not  normally  have  any  adverse  effect  on  the  sound  or  picture  quality  of  tuners  or  TVs.  Other 
possible  solutions  could  include  using  an  isolating  transformer  or  an  isolating  device  offering 
complete galvanic isolation. Please seek the advice of a specialist. 
Power  strips  with  built-in  filters,  mains  filters  or  replacement  mains  cables  are  not  appropriate 
solutions. 
  

Note 

Switching  power  supplies  are  quite  common  nowadays.  These  are  often  fitted  with  a  protective 
earth terminal (PE) and an RFI filter. When using such units, the protective earth terminal 

must

 be 

connected  to  the  wall  socket. 

You  must  never  remove  this  protective  terminal,  as  doing  so 

could cause high levels of radio frequency interference to enter your system, which could 
affect the operation of other digital equipment, including remote controls.

 

 

Содержание V 110 SE

Страница 1: ...V 110 SE Owner s Manual English...

Страница 2: ...insights into the interaction of amplifier and loudspeaker With tube amplifiers in particular a general reluctance to depart from the classic circuit designs has not done the technology any favors Alt...

Страница 3: ...4...

Страница 4: ...ector alternative output tubes 18 6 2 Changing the damping factor 19 6 2 Protection 20 6 3 Soft Start 20 6 4 Ecomode 22 6 5 Front Channel 22 6 6 Pre Out regulated 22 6 6 1 Using with an active subwoof...

Страница 5: ...6...

Страница 6: ...ciple The much misunderstood negative feedback does its job extremely well without having any influence on the acoustic side The new amplifier generation impresses with extreme linearity significantly...

Страница 7: ...engineer to replace blown fuses with ones of the same type and rating If your amplifier requires servicing please ship or take your equipment directly to OCTAVE or to one of our authorized service ce...

Страница 8: ...le materials gases or vapors 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 a stable level surface 2...

Страница 9: ...control 2 screwdrivers 1 x 2 mm flat bladed screwdriver for adjusting the bias 1 x 2 5 mm Allen key for removing the cover Owner s manual with warranty card Cloth and gloves 3 2 Removing the grille Pr...

Страница 10: ...nent as well as tube life considerably by protecting against stress caused by typical high inrush currents during switch on Procedure Check that the Ecomode switch on the rear panel is in the Eco off...

Страница 11: ...ter an additional 5 to 10 minutes the BIAS control LEDs will change from yellow to green This indicates the correct bias and the unit is ready If you notice any irregularity in the display please refe...

Страница 12: ...13 3 GETTING STARTED 3 7 Connection options overview...

Страница 13: ...level input for tuner etc Pos 3 Aux 1 RCA line level input for video etc Pos 4 Aux 2 RCA line level input for video etc Pos 5 CD 2 XLR line level input for CD SACD or similar Pos 6 The electronic BIA...

Страница 14: ...witched on Protection Red LED lights up when the electronic protection system has switched off the amplifier in response to an amplifier fault see chapter 6 3 Soft start Lights up during the soft star...

Страница 15: ...with Phono option AUX 1 RCA line level input for Video etc Tape Rec Record output for tape or DAT GND Ground connector for Turntable Front Channel Input for the front channel of a multichannel receive...

Страница 16: ...pacitance upgrade for the power amplifier section see chapter 10 You should switch off the V 110 SE using the power switch before connecting and disconnecting the Black Box AC supply socket IEC socket...

Страница 17: ...he maximum output power is limited to 2 x 70 W to avoid overloading these tubes The rather rare tubes of type KT 90 and KT 100 can be used also in the LOW position The EL 34 can be used in the LOW Pos...

Страница 18: ...speakers popular example are the models of the B W 800 series whose impedance increases by design in the midrange The HIGH version has ad vantages for electrostatic speaker such as Martin Logan which...

Страница 19: ...he output tubes 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 110 SE back on is to turn the on off switc...

Страница 20: ...s off the amplifier is on Eco on The Ecomode electronic is activated Ecomode is signal actuated after a 9 minute silence Ecomode switches in automatically The soft start LED 6 indicates that the Ecomo...

Страница 21: ...crossover in the subwoofer electronics will block unwanted DC and low frequency signals 6 7 2 Using the V 110 SE in bi amped systems Another option provided by the adjustable Pre Out is bi amping via...

Страница 22: ...S current to two different values low and high in addition to the Power selector High and Low Output tubes can be divided into two broad classes classic pentode output tubes for medium power amplifier...

Страница 23: ...d Using selected output tubes only makes sense if the idle current is adjusted accurately as is clearly shown in Fig 1 Technical Data How to set the BIAS Turn the Input selector knob 2 clockwise to th...

Страница 24: ...00 6550 KT 90 See chapter 7 2 These tube types do not have to be operated at a high BIAS setting they will work perfectly well on the low setting However certain loudspeakers may benefit from the high...

Страница 25: ...3 2 New untested output tubes should be allowed a longer warm up period You should adjust these tubes after about 20 minutes 7 5 Running in All OCTAVE equipment is subject to a 48 hour soak test at t...

Страница 26: ...ctive RIAA equalization with an active 2nd order subsonic filter The phono preamplifier uses semiconductor technology throughout The subsonic filter suppresses undesirable low frequency signals in the...

Страница 27: ...s dynamic range separation depth soundstage size and articulation rendering the musical reproduction clearer throughout the entire frequency range The amplifier remains unaffected by mains variations...

Страница 28: ...discharges the unit s electrolytics The yellow LED indi cates that this procedure is taking place The discharge circuit also activates if the SBB connecting cable is accidentally removed This is to pr...

Страница 29: ...rs you have two grounded components connected to the V 110 SE You must now unplug your components in reverse order to find out which of them is grounded Usually the hum will still appear even when the...

Страница 30: ...fridges and 12V halogen lamps can produce strong radio interference when they turn on and off Depending on the wiring in your home this can result in clicks and pops in your loudspeakers To fix the pr...

Страница 31: ...he BIAS screws to the extreme right and leave them there If you have not been able to adjust the BIAS satisfactorily turn the adjuster screw back to its extreme left position Driver tube heater fault...

Страница 32: ...e protection system to trip Should this happen switch the V 110 SE off and replace the problem tube Faulty driver tube In very rare cases a problem with one of the driver tubes can cause the V 110 SE...

Страница 33: ...3 minus Output stage Output Power into 4 ohms Power Selector High 2 x 110W RMS Power Selector Low 2 x 70W RMS Peak Power into 4 ohms Power Selector High 2 x 130W Peak Power Selector Low 2 x 90W Peak I...

Страница 34: ...up time 50 sec Power consumption 500 W at full power 190 W idle 20 W in Ecomode Weight 22 70 kg Mains fuse For 230 240V 4A slow blow H 5 x 20 mm For 115 240V 6 3A slow blow H 5 x 20 mm For 100V 6 3 A...

Страница 35: ...usted correctly Curve 2 BIAS 10 out Curve 3 BIAS 30 out Graph 2 Frequency response 5 W into 4 ohms The frequency response curve clearly shows the low frequency extension of the V 110 SE linear to 10 H...

Страница 36: ...W into 4 ohm there is no mains interference to be seen 50 Hz 200 V 100 Hz 70 V The k2 k3 k4 and k5 noise spectrum is extremely low and falls quickly Audio Precision A A FFT SPECTRUM ANALYSIS V 70 SE...

Страница 37: ...checked but these will generally last for well over 10 years 4 Does the V 110 SE have to have all of its tubes fitted In principle the V 110 SE will also operate without tubes It is sometimes useful...

Страница 38: ...tave 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 o...

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