User manual HUGHES & KETTNER DUOTONE HEAD

[. . . ] There is not a single transistor in the entire signal path. The hallmarks of the Duotone are not only its exceptional sound quality but also its reliability and stage-worthiness. all amps of the Custom Tube Series ship with tubes that satisfy the highest standards for quality and assure maximum reliability under even the most arduous operating conditions. With two footswitch-selectable master Volumes and a healthy 100 watts of tube-driven power, the Duotone is a joy to play - with it you'll feel at home on any stage. [. . . ] Ensure the amp's voltage rating matches your local AC voltage rating before you plug into the wall socket. The mains fuse bracket is located next to this socket. When replacing blown fuses, make sure you use specified replacement fuses only (see TECHNICAL SPECIFICATIONS). aNODE FUSE: This is the holder for the power tubes' anode fuses. Here too, make sure you use specified replacement fuses only when replacing blown fuses. If a replacement fuse blows after just a short while in operation, you should definitely have the power tubes checked for defects. fX LOOP: Parallel , tube-driven circuit designed to accept signal processors. The effect signal is mixed in with the original signal (rather than replacing it entirely, as is the more common method, in a serial effects loop). this ensures the purity of the original signal remains intact. For this reason, we recommend that you set the wet balance on the effect device itself to 100%, and do the mixing of wet-to-dry by adjusting the FX-LEVEL knob on the amp. FX SEND: Sends the original or dry signal to the input of your effect device. FX RETURN: Receives the effect or wet signal from the output of your effect device. FX SEND LEVEL: Adjust this control to make sure the level of signal you're sending to the input of the effect device is neither too hot nor too soft. You can activate either channel of the Duotone via the front panel CHANNEL SELECT button or via footswitch. the red LED on the footswitch illuminates when the OVERDRIVE channel is selected. When the LED is off, this indicates that the CLEAN channel is active. When you activate BOOST, the red LED on the footswitch lights up. Either of the two variable master levels can be activated via footswitch. The red LED on the footswitch lights up when MASTER 2 is selected. When the LED on the footswitch is off, this indicates that MASTER 1 is active. The Duotone is equipped with a parallel effects loop, meaning the original signal always comes through, and the processed signal is mixed in with it. NOTE: When you're trying to dial in a suitable signal level, you'll find that it's harder to come up with good results when you're using a multieffects processor that features an on-board preamp (actually, any kind of signal boosting circuit) but does not allow you to patch signals in after its preamp and in front of its effects section. [. . . ] The tubes can cool off completely first. proper biasing and trimming extend service life. Whenever you feel that tube wear is on the rise, be sure to have a technician check the amp's bias and trim settings. Here are a few more basic rules that will extend the service life of your amp enormously if you follow them: â· Make sure all peripheral devices and connecting cables are in a state of good repair! [. . . ]