#BIAS GUITAR AMP WITH OSCILLOSCOPE HOW TO#

These amps (for example, all Mesa Boogie models) use a fixed resistor to bias the tubes, not a bias pot, and are designed to run with tubes that have a specific current draw range and should only use tubes that fall within that certain range. Non-adjustable fixed bias amplifiers without an adjustment pot cannot be bias adjusted. When ordering you should mention the rating you require in the “Comments” box on the checkout page. If you already have tubes with our Perfect Pair rating, or rated tubes from another seller such as Groove Tubes, you can replace them with a new set that has the same rating and safely avoid rebiasing.

#BIAS GUITAR AMP WITH OSCILLOSCOPE HOW TO#

Until you learn how to do it correctly by yourself, it's best to pay a technician a few dollars to do it for you. Also, an unbiased amp may sound horrible or cause undue wear and tear on the tubes or power supply. It's not difficult and it doesn't take long but if you don't know what you're doing you may hurt yourself (amps can give lethal electric shocks even when unplugged, and NO, we're not just saying that to scare you). Adjustable 'Fixed' Biasįor adjustable fixed bias amplifiers, the amp should be biased by a tech with experience with this procedure. Cathode Bias amplifiers (also commonly referred to as self-biasing)Įach of these types is unique.Adjustable Fixed Bias amplifiers (adjustment potentiometer to set the 'fixed' bias point).Non-Adjustable Fixed Bias amplifiers (no bias adjustment potentiometer).The bias methods of amplifiers fall into three basic categories: Many tube amp owners are unaware of this simple regular service for their amp that will keep it sounding its absolute best. Some amps do this automatically, but many do not - particularly in the world of guitar amps. Just like the idle of your car may need adjusting when a major change is done to the engine, new power tubes need their idle (the 'bias') adjusted to make sure the amp sounds as good as possible. Clearance - Bargains - Scratch and Dent.

Bias guitar amp with oscilloscope