On 95% of all tube amplifiers, you’ll need to bias the amp whenever you change tubes. You can turn your perfect, steady stream of water into a slow drip (By running it cold) or an uncontrollable overflow that’ll eventually flood your kitchen (Running the amp too hot and letting too much power run through). If your perfect bias is a steady, smooth stream of water flowing from a tap, then having the amp incorrectly biased can drastically alter that flow. Tube Amp Bias is like water through a tap This is the balance between tube life, and ultimately, the best tone. Happy valves means happy tone and a very happy player.
Run the valves at optimum – This is somewhere between hot and cool where the valves can perfectly resist the power coming at them. At worst you’ll melt other components in the amp further down the line or even cause an electrical fire. At best you’ll get an overly saturated tone with a much shorter valve life than normal. This can cause massive problems for your amp because you’re allowing far too much power through the power amp circuit. Run the valves too hot (Under-biased) – This means you’ll cook and saturate the valves very quickly. Valves will probably have a far longer life because they aren’t being overworked but the amp will never sound the best that it can. Run the valves too cold (Over-biased) – This means that there isn’t enough voltage being provided to the power amp valve which will give you a thin, sterile sound without any of that lovely warm tube saturation. So if you don’t bias your amp correctly you’ll face the following scenarios: This means you can get the best possible tone out of them because the tubes are being fed the correct voltage according to the valves resistance.Ĭorrectly biasing your amp will mean one set of valves can have incredibly long life because they’re running at the perfect ‘temperature’. In absolute layman’s terms, having the correct tube amp bias will ensure that your power amp valves run at their optimum. Voltage capacitors retain their charge which can be very dangerous! So why is Tube Amp Bias important? Even if the amp is switched off or has been off for a few days. There’s a lot of charge stored in a tube amp and just touching the wrong part of the amp CAN KILL YOU ?. This should only be done by a trained amp tech. Please note: We do NOT recommend that you attempt to bias your own amp. Typical power amp valves are E元4, EL84, 6V6 and 6L6GC valves. It’s also worth noting that when talking about tube amp bias, only the power amp valves are in question. But, it’s worth having a basic understanding so that the next time you pop into the store and your sales assistant explains that the Mesa Boogie Mark V is a fixed bias amp and the Fender Hot Rod Deluxe isn’t, you won’t be completely in the dark. 
This is because adjusting the bias on a tube amp can be very dangerous if not done by a professional. The guitar community seems to be shrouded in the mystery that is tube amp bias and in a way, it’s probably for the best.
When you need to have a tube amp biased.How tube amp bias will affect your guitar amp tone.
It ensures the tubes are fed the correct voltage according the valves resistance rating. Tube Amp Bias is an electronic process that ensures the power amp tubes in your valve amp run at their optimimum capacity so that you can get the best possible guitar tone out of them.
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