Hughes & Kettner Preamp/Recording Amp - Manual (Page 4)

BOOST SWITCHES: The three black pushbutton-switches for Bass, Mid, and
Treble, are specially contoured to offer a dramatic amount of tonal control
instantaneously.
BASS: Boosts the frequency range from 80 to 400 Hz by approximately + 6 dB,
bringing out fundamentals more strongly and adding a clearly audible “punch” in the
low bass region.
MID: Boosts the range between 500 Hz and 2 KHz by approximately + 2 d B adding
clarity to the attack of each note, and providing the necessary penetration in band
situations.
TREBLE: Boosts the entire frequency range between 1 KHz and 20 KHz by
approximately + 8 d B This emphasizes the harmonics inherent in the instrument,
adding bite and sparkle overall. The TREBLE boost in combination with the TONE
control is capable of producing some extraordinarily bright sounds.
LINE P R E / POST POWER AMP With this switch, to the right of the three boost
switches, you can select whether the signal appearing at the LINE OUT jack is tapped
immediately after the preamp tube, or whether it goes through the power amp tube as
well Your choice will have a considerable effect on the overall sound. By fine tuning
the GALN and MASTER controls while using alternate settings of this switch, you can
uncover further sound variations, from clear, to gritty, to growlly, to all-out overdrive.
TUBE AMP / BYPASS SWITCH: This switch on the back of the unit will
normally be set to TUBE. The LED next to the INPUT on the front panel will
confirm this by being illuminated in tube mode and dim in bypass mode. In normal
operation the signal runs through the tube section and appears at the LINE OUT,
SPEAKER OUT, PA OUT, and INSTRUMENT OUT jacks. In bypass mode, the PA
OUT jack is inoperative, thus allowing you in a live situation to tune up or swap
instruments easily without being heard by the audience through the house system. The
TUBE/ BYPASS function can also be switched using a conventional on-off footswitch.
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