deBont Detti 125 User manual
Detti 125 Tube Power Amplifier
Owner’s Manual
Index
Front
Front panel
Status LED
Back
Line input
Speaker outputs
Voltage selector
Power cord receptacle
Power switch
Main fuse
HT (B+) fuse
Replacing a fuse
Fan
How to replace tubes
Front
█ Front panel
The front panel of the Detti 125 tube power amplifier is void of any buttons, switches or other
controls, minimizing the chance of any accidental operating mishaps. Exception is the status
LED, showing the amp’s current state of operation.
Warning: never cover the front grill while the amplifier is turned on. It’s a vital part of the
airflow for cooling the inside electronics.
█ Status LED
The color of the status LED shows you exactly how the Detti is performing at any given
moment:
● green (solid): The amp is warm, bias is set, everything is good to go. Monitoring of all
vital elements will continue in the background
● orange (solid): The amp is warming up. Bias and other systems are checked
continuously and adjusted if necessary.
● red (solid): Initial startup color
● red/off (blinking): No bias voltage detected. The amp will turn itself off to prevent
damage to the power tubes.
● blue/off (blinking): The fan is not turning. Check for blockage. The amp will turn itself
off after 2 minutes.
● blue/red (blinking): The fan has not been turning for 2 minutes. The amp will turn
itself off to prevent thermal damage.
● yellow (blinking): Temperature error. The amp is overheating and will turn itself off.
deBont Amps Detti 125 Tube Power Amp Owner’s manual
Back
█ Line Input
A single Neutrik Combo series jack/XLR input connector. It will accept a 6.3mm (1/4”) jack
(TS or TRS) or XLR plug and will work with both balanced or unbalanced signals. However,
a balanced input signal is preferred over an unbalanced one. An unbalanced 4Vpp or
balanced 2.4Vpp input signal will drive the Detti to maximum power output.
█ Speaker outputs
The Detti is equipped with three Neutrik SpeakOn Combo receptacles. One for each
supported speaker impedance; 2, 4 and 8 ohms. You can use either a 6.3 mm (1/4”) jack or
Neutrik SpeakOn plug to connect a speaker cab. It is imperative you only use one speaker
output at a time. Using multiple will impair proper operation and might cause damage to the
amplifier.
Warning: Always have a (speaker)load connected when the amp is turned on. The outputs
are protected, but applying big signal to the input with no load connected might result in
serious damage to the amplifier.
Warning: Only use proper speaker cabling. Never use instrument cables or the likes.
█ Voltage selector
The Detti can be used in countries with mains voltages from 110VAC to 120VAC or from
220VAC to 240VAC. Choose the voltage closest to the actual mains voltage by turning the
selector with a small screwdriver, until it clicks into place. Failure to do so will either cause
the amp to not work properly, or cause serious damage to the inside electronics.
█ Power cord receptacle
The Detti is fed by a IEC 60320 C13 plug, better known as a computer plug. Please make
sure the power cord is undamaged and of proper quality.
█ Power switch
Use this switch to turn the amplifier on or off.
Note: There’s no standby switch as seen on most other tube amplifiers. The Detti will take
care of all processes normally associated with standby switches.
deBont Amps Detti 125 Tube Power Amp Owner’s manual
█ Main fuse
This fuse cuts power to the entire amplifier in case of a serious fault.
█ HT (B+) fuse
For safety reasons, the high voltage used in the Detti has its own dedicated fuse.
█ Replacing a fuse
Turn off the amp, unplug the power cord and let the remaining energy drain for at least 20
minutes before checking and/or replacing any of the fuses. Always replace with a fuse of the
same rating as stated on the back of the amplifier below the fuse holder.
Note: Fuses usually blow for a good reason. Please consult a qualified technician when
replacement is necessary.
█ Fan
The Detti requires active cooling for both the electronics and to maximize the lifespan of the
power tubes. Air is sucked in through the back and blown out through the front grill. Blocking
the fan or stopping fan rotation altogether will result in the amp shutting itself off to protect
itself against thermal damage. The front panel status LED will first blink blue/off. If fan
operation is not restored within 2 minutes, the front panel status LED will blink blue/red and
the power is cut.
deBont Amps Detti 125 Tube Power Amp Owner’s manual
█ How to replace tubes
The procedure to replace either the small signal tubes or the power tubes is roughly the
same. The small signal tubes do not require biasing. The power tube’s individual bias
settings are fully automated thanks to rockSteady bias.
!WARNING!
Never turn the amp on when the top cover is removed. The voltages used
inside the Detti are lethal!
Procedure
1) Turn off the poweramp.
2) Unplug the power cord.
3) Let the tubes cool down and the power supply drain any residual voltage for about 20
minutes
4) Remove the top cover.
5) Carefully and slowly remove the tube you want to replace by gently pulling and ever so
slightly wiggling it. Easy does it.
* in case of a power tube, carefully lift the metal retainer and put it alongside the tube
6) Press the new tube into the socket. It can only go in one way. Don’t force anything!
7) Replace the top cover and tighten screws.
8) Turn on the amp and let it adjust itself to the new tubes for about 10 minutes.
9) Rock on.
deBont Amps Detti 125 Tube Power Amp Owner’s manual
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deBont Amps Detti 125 Tube Power Amp Owner’s manual
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