The more evenly your tubes are matched, the more evenly they'll run since I only get to send 1 DC current into the tubes.
As all tubes aren't created equal (even same manufacturer same tube type), this is the importance of getting "matched" sets. When you set the "bias", what you're doing therefore is regulating the amount of DC current going to your tubes. What happens when they're not synched up? For those car nuts out there, consider this as a 4 barrel carb. When I put a single gas supply to those engines (like the current in an amp), they'll all run differently and the car will be off balance. Now, assume that it takes 4 of those engines per car. Put them all in the same Vette and engine 1 requires less gas to get to 70mph than engine 2 and so on. Let's say Chevy had those engines made in, um, not a country known for its manufacturing skill, so each time they get one in, engine 1 puts out 300hp, and engine 2 puts out 220hp, and engine 3 puts out 266hp, etc. Now, let's change it up to better understand tubes. Same engine, but it's gonna take a lot more gas to get the truck up to 70mph.
Now, put that same engine in a GMC 1/2 ton pickup. It needs a certain amount of gas to get that Vette up to 70mph. Consequently, from tube to tube, each individual tube may require more or less voltage to get to its optimal operation point.Ĭonsider a Corvette engine in a Corvette. However, remember that tubes are hugely outdated technology only made in a few places in the world now and so they are HIGHLY inconsistent. What is tube biasing? OK, so all tubes, to hit their optimal tone and operation, need a certain amount of current.
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