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(8) TREBLE:

The TREBLE pot adjusts the high frequency through a wide band and determines
the amount of bite and harmonics. The center frequency is app. 

8khz.

(9) FX-MIX:

The 

Bassbase 250 

is equipped with an effects loop switched in parallel for

external effects devices. Conventional effects loops, switched in series, send the
entire signal through the effects device, whereas the Bassbase’s FX-MIX pot
allows you to determine the precise amount of the original signal you want to
send through an effects device.

FX-MIX: The far left position allows none of the signal to be sent down the
effects loop path. Rotate the pot to the far right, and the entire signal is sent for
processing. (The effects path functions now in the same fashion as in a
conventional effects loop).

NOTE: If you choose not to connect an external effects device, ensure the
FX-MIX pot is rotated completely left!
The effects loop can be switched on and off via a footswitch.

(10) MASTER VOLUME:

controls the overall volume of the BASSBASE 250.

(11) DYNACUP:

A control LED illuminates when 

DYNACLIP 

is operational.

DYNACLIP 

is a power amp circuit that was developed exclusively for the

BASSBASE. It efficiently suppresses power amp clipping without sacrificing
peak dynamics, as opposed to peak limiters. Unpleasant and potentially speaker
damaging distortion is avoided and the effective power output is increased.

(12) BAL.PA OUT:

This XLR 

output jack 

sends a transformer balanced signal to feed a PA board.

(13) DIRECT:

Depress the DIRECT switch to bypass Gain, tone controls and the effects
loop to send an instrument signal via BAL.PA OUT.

Summary of Contents for BASSBASE 250

Page 1: ... BASSBASE 250 BASS AMPLIFIER COMBO AMPLIFIER Hughes Kettner Musical Instruments GmbH Magdeburgerstr 6 6690 St Wendel Telefon 0 68 51 20 21 Telefax 0 68 51 48 86 ...

Page 2: ...ristics and carefully dosed upper frequency range The basic tone of tube technology is most convincing from a dark warm jazz tone through to an articulate punchy rock sound down to the high attack of funk the Bassbase 250 can do it all Carefully balanced tone controls with a parametric midrange The four tone controls enable you to quickly and efficiently dial in your own basic tonal characteristic...

Page 3: ...oduction Ergonomic back lit front panel controls The front panel controls are arranged for maximum accessibility and simplicity Potentiometers function permitting are center notched for a memory effect Back lighting provides for visibility on even the darkest stages The Bassbase 250 was engineered to provide you with the opportunity to comfortably create your personal sound This manual will give y...

Page 4: ... the TUNER jack receives the signal The MUTE function is especially convenient for silent tuning between songs or sets when it is less than desirable to have audience participation MUTE is also recom mended when switching the power off changing instruments etc 4 GAIN The Bassbase s preamp is constructed with tube circuitry lending the amp a dynamic warm sound typical of classic tube technology The...

Page 5: ...parametric allowing you to freely choose the frequency range which you want to influence The semi parametric tone control has two pots one to determine the frequency range that is to be adjusted and the other to increase or decrease said frequencies This allows the mid range to be custom tailored to your personal tastes 6 FREQ This pot dials in the frequency you want to adjust app 2000 bz rotated ...

Page 6: ...h functions now in the same fashion as in a conventional effects loop NOTE If you choose not to connect an external effects device ensure the FX MIX pot is rotated completely left The effects loop can be switched on and off via a footswitch 10 MASTER VOLUME controls the overall volume of the BASSBASE 250 11 DYNACUP A control LED illuminates when DYNACLIP is operational DYNACLIP is a power amp circ...

Page 7: ...cket and pull the fuse out The appropriate fuse amperage for each model can be determined by reading the value annotated below the fuse bracket VOLTAGE SELECTOR All European models can be adjusted to operate at 220V or 240V Rotate the insert in the fuse bracket to the desired position The correct voltage is determined by the number visible in the upper region of the fuse bracket Ensure this number...

Page 8: ...on the front panel Connect SEND to the effects device s INPUT and RETURN to the effects device s OUTPUT The voltage level of the FX LOOP can be adjusted with the 10db switch from 1v down to 300mV in or r to accommodate different types of effects devices NOTE If you don t connect an effects device the RETURN jack can be used to connect an additional instrument guitar bass keyboards or another signa...

Page 9: ...e used in the BASSBASE is one of the most commonly used and the most affordable Generally speaking a change of valves is only necessary every few years Before opening the amplifier casing ALWAYS remove the mains plug WHERE TO USE THE AMPLIFIER do not use the unit under following conditions n extremes of temperature or high humidity n poor ventilation or insufficient cooling n extreme vibrations or...

Page 10: ... ON OFF w EXTERNAL SPEAKER CAB 0 0 01 0 II 0 0 TUNER w TUNER INPUT PHONES M PHONES FX SEND b FX INPUT FX RETURN a FX OUTPUT SPEARER LINE OUT BALANCED PA OUT w EXTERNAL POWER AMP CASINETD SlGNAL FOR PA APPLKATIONS n 0 0 0 SIGNAL FOR RECORDING STUDlO APPLKATIONS ...

Page 11: ...e you a general impression of the Hughes Kettner Bassbase 250 s sound spectrum MODERN BASIC BASS GAIN BASS FREQ MID LEVEL TREBLE FX MIX MASTER 1 1 4 5 6 7 3 8 0 5 I STRAIGHT ROCK SOUND I 1 54 BASS FREQ 4 MID LEVEL TREBLE FX MIX MASTER 1 5 9 6 7 5 5 I ITHE FUSION SET GAIN BASS FREQ MID LEVEL TREBLE FX MIX MASTER 17 6 8 4 8 0 5 THE SlAPAlTACK GAIN BASS FREQ MID LEVEL TREBLE FX MIX MASTER 1 14 8 6 3 ...

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