Sound Performance Lab Kultube Model 2049 User Manual

Carefully select a place for setting up the Kultube. The unit should be situated 
away from heat sources and direct sunlight. Avoid installation in environments 
exposed to vibrations, dust, heat, cold or moisture. Keep the unit away from 
transformers or motors or any other unit that could generate large variations 
in power supply or cause electrical interferences. Do not install the unit in 
proximity to power amplifiers or digital processors. You may consider placing 
it in a rack containing other analog gear. Such placement can prevent interfe-
rence from Word Clock, Smpte, MIDI, etc. 

• Do not open the case. You may risk electric shock and may damage your  

equipment.

• Leave repairs and maintenance to a qualified service technician. Should  

foreign objects fall inside the case, contact your authorized dealer or support  
person.

• To avoid electric shock or fire hazards do not expose your unit to rain or  

dampness.

• In case of lightning unplug the unit. Please unplug the cable by pulling on  

the plug only; never pull on the cable.

• Never force a switch or knob.

• To clean the case use a lint-free cloth. Avoid cleaning agents as they may  

damage the chassis. Manufactured in standard 19“ EIA format, it utilises 
two    rack units.

• Please support the back of the unit whenever it is being mounted into a 

19  inch rack (especially important when touring).

Built around a torroidal transformer, the power supply allows for a minimal 
electromagnetic field with no hum or mechanical noise.  The power supply‘s 
output side is filtered by an RC circuit to extract noise and hums caused by 
your power service. 6000 µf capacitors smooth out the positive and negative 
half waves. An additional power supply filter is placed before the power switch 
to eliminate disturbing influences. 

All signal processing components are supplied with two separate current 

regulators to exclude influences from the remaining components. 

The 220 v current for the tube stage power is smoothed out with 200 µF 

and stabilized precisely by current regulators.  A current limiting ensures  a 
sparing warm up phase. The anode current is switched on after warm up. Both 
measures ensure a remarkable extension of the tube‘s lifetime.

The supply voltage can be set to 230 V/50 Hz or 115  V/60 Hz. Check your 

country‘s power requirements for the appropriate setting. An AC power cord 
is included to feed the IEC-spec, 3-prong connector. Transformer, AC cord and 
IEC-receptacle are VDE, UL and CSA approved. 

The main fuse is rated at 315 mA for 230 v and 630 mA for 115 v.

Chassis ground and AC ground can be physically disconnected with the 

“GND Lift” switch on the rear panel to eliminate hums.