Then they get uncomfortable.Ĭathode bias works - but at a big cost. In fact, they won't even tell you it's cathode bias unless you ask specifically. This is what some companies call "Auto Bias", which is NOT correct. But also found in $20,000 high-end audio amps. More important is, how do you keep tubes perfectly synchronized when you “accelerate”, and what do you do about aging? Before PrimaLuna, there were two ways to bias tubes:ġ) Cathode Bias: Commonly used, cheaper to make, and often found in guitar amps. If the idle is too high, you will waste gas, cause premature engine wear, and early failure. If the idle is too low, the car can sputter or stall. Think of biasing like adjusting the engine idle speed on your car.
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