You can connect a bass to the AMP1, like any other guitar amp.

Then turn up the volume of the guitar, and you can hear the noise that comes from the guitar.Īs a next step you may check all pedals used in front of the AMP1 or in its FX loop step by step, until you can isolate the source of the humming.Ĭan you use the AMP1 also for Bass Guitar or will it harm the AMP1? Any change in the noise comes from the cable. Next step: connect a guitar to the amp’s input, and put the guitar volume down. What you’re hearing now is the noise from the preamp(s). any cable) from the AMP1’s input, connect a speaker cabinet to the amp and switch the noise gate on. Please proceed as follows to identify the source of the noise:ĭisconnect the guitar cable (resp. There are many possible reasons for a humming noise coming from any guitar amplifier. Sometimes the use of another socket or a different circuit is also helpful. A missing ground is also dangerous! Please make sure that the correct power cable is used. The AMP1 - just like any other guitar amplifier - it must always be properly grounded. Likewise, there should be lower feedback if you turn the Treble Pot down on the guitar. If this is the case, the feedback is lower if the distance between the pickups and the speaker is increased, when the guitar is moved away from the loudspeaker. In this case, feedback is generated between the guitar pickups and the speaker. The feedback does not occur until the volume pot of the guitar is turned up.Therefore, the guitar cables and the speaker cable should be replaced. The most obvious reason is then bad or defective cables. In this case, the cause of the feedback is somewhere between the amp's input and the speaker. Does the feedback also occur when the volume pot of the guitar is turned off?.Is the live setup exactly the same setup as at home?Īdditional or other components can be considered a cause of feedback.To find out where the problem comes from, consider the following: If the AMP1 works at home without problems, then with certainty we can assume that the AMP1 is not the problem. There are several possible causes for such a phenomenon. The AMP1 setup works at home without problems, but on stage there are sometimes feedback problems with the overdrive channels. These LEDs are always working, but they can only be seen from the outside when the CLEAN channel is selected. This is completely normal and has no effect on the sound. These are indicated by a plastic ring around the foot switch for channel selection when the CLEAN channel is activated. Inside the AMP1 there are LEDs which serve as an optical confirmation for the signal flow and the signal level. When the CLEAN channel is active, the LED on the Channel Select switch on the AMP1 changes its brightness depending on the signal level. If that is a problem, one should use a switchable power strip, so that one can disconnect the device by switching it off completely from the power supply. In many other tube amps a similar phenomenon occurs. The transformer also builds up its magnetic field in this switched off state, which then goes directly into the speaker and becomes audible. Strictly speaking, the AMP1 is then in standby. As a result, when the amp is switched off, there is no proper disconnection from the mains, as is the case with many modern devices. Yes, The power switch of the AMP1 is located in the secondary circuit. If the AMP1 is connected to a power supply via the power cable and via a box cable to a loudspeaker, it hums quietly but audibly in the box, even if the AMP1 is switched off.

Rec tube bypass