Important: If changing tube type see tube rolling below. To check your bias, simply turn the bias selector switch to V1, V2, V3 or V4. 15 (fifteen) minutes if it’s the first time setting bias.ģ. It is important to allow the unit to warm up for at least 5 (five) minutes. To start the process, turn the unit on with the volume knob turned to 0 (zero). Just use the included Tuning Wand to make it easy!ġ. Once you do it once you will be able to do it without looking at this page ever again.Ī quick and easy method to bias the amplifier is to make certain the tube is at the right bias point or to re-bias. You must re-bias every time that you change/replace a tube in the amplifier.įirst thing is to Breathe this is really easy and very hard to mess up. There will be fluctuations in the bias of the amplifier that is due to either the changes in voltage (in some regions of the country the voltage can vary depending on the time of day or on what type or how much electrical equipment is operating in a given home) or because the thermal balance of a tube may be such, that the tube after it has been on for one minute will not have the same bias after it has been operating for five hours.Ĥ. However, we suggest you take a second to turn on the meter and check your bias once a month for maximum performance and tube life. In general, after the initial biasing, you do not have to bias the Fusion Amplifiers for six months. Black Ice Audio also recommends biasing if there is a reduction in the volume due to the natural wear of the tube over time, or when new electron tubes are installed.ģ. Secondly, AC voltage levels can vary from one geographical region to another, and thus the AC voltage can be different from the Black Ice Audio testing voltage of 117 volts which can raise or lower the bias setting.Ģ. First, significant vibration during shipping can affect the tubes or cause minute movements in the bias trim potentiometers and thus change the bias setting. The unit's bias is set at the factory, but there are two major factors, which can cause a change in the bias setting. When you first receive the amplifier, there is a possibility that the bias may have to be adjusted on the amplifier. The following are situations when biasing is needed.ġ. This allows maximum tube life and is far superior to any auto-bias system on the market, not just the "Cathode Bias" based solutions.īiasing is a simple procedure requiring only one tool and a few minutes of your time. that all the tubes are pushing out approximately the same amount of electrical power. It’s that easy!īiasing is used to make sure the tubes are electrically operating in a similar manner, i.e. The needle moves slowly and exactly as you are turning it, so there is no guessing, when it shows the correct number stop turning, if you overshoot turn it back. Simply put, it’s turning a potentiometer screw clockwise or counterclockwise and setting it to the right number that is shown in the meter. However, on our amplifiers, biasing is a simple matter of using the Exact Biasing system and the included Wand. When customers hear us say that you’ll have to bias your amplifier under certain circumstances, there can be a moment of panic.
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