This lets you set and evaluate the full reasonable biasing range your amp and While adjusting the bias control pot of your amp, theīias Easy™ shows the actual current flowing through each of two power tubes.Ī switch on the meter allows you to go back and forth between the two tubes. The Bias Easy™ 800 allows you to monitor the bias Plated pins and socket, power adapter and Used with a basic multimeter ( Get Yours Here ).Ĭurrent in the power tubes of your amp. Socket, gold-plated socket pins and gold-plated banana plugs to ensure solid connections andĭevice is fully assembled and ready to use! Complete with detailed Requires separate digital volt-ohmmeter capable of reading current.Īdapter will NOT test 7591 tubes. The higher the setting, theįor 8-pin power tubes such as 6L6, 6V6, 5881, 6550, The high end of the range isįor warmer and thicker sound, but with resulting "cooler" setting, for cleaner sound and longer Note: The low end of the suggested range is the Plate current and/or cathode current will be calculated. The Plate Voltage of the amplifier below. Some smaller amps with 6V6 power tubes also have adjustable bias (Fender DeluxeīIAS CALCULATOR (for push pull class AB1/AB2) The Hot Rod Deluxe/Deville and Blues Deluxe/Deville, for example). Mesa-Boogie amps, some Peavey amps, and even some Fender amps (early versions of Most amps with two or more 6L6 or E元4 power tubes fall into this category. Larger tube amps do (output power of 40 watts or greater, typically). Not all tube amps have adjustable bias, but most Again, the "sweet spot" in between is where most techs set A "cold" bias means that the tubes are running muchĬolder, the tone is cleaner and a bit more sterile, but the tubes last much Warm, harmonically-rich tone, but experiencing decreased tube life due to the Is like a control valve that regulates the current through the power tubes.Ī "hot" bias means that the power tubes are running hard (and hot!), giving a In many tube amps, the bias on the power tubes is adjustable. Gave sufficient engine power while maintaining decent gas mileage.
Most people opted for a mid-range setting that A rich mixture would have more power, but wouldĭecrease gas mileage. A lean mixture would have less power, but Best analogy of bias adjustment that we can think of goes back to older cars
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