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The bias point for 6L6GC tubes depends on the plate voltage that the amplifier is designed to use. Most amps using this tube run between 430-450 volts DC. The 6L6 bias point at 60% dissipation for an amp designed to use 450 volts is: 30/450 x .6 = .04 or 40mA.
6L6 Author: RCA Subject: FP-1999-02-28 Created Date: 2/24/2002 7:46:40 PM ...
26 lip 2001 · There is only one source of bias voltage, so the voltage at every tube's grid will be the same (it better be!). If you want to bias the amp properly, you will need either a bias probe, or a very good 1 ohm resistor and an equally good meter.
20 cze 2024 · Is there a formula or chart for finding the correct cathode resistor for biasing a 6l6 tube? According to my math I have 380v plate voltage running .074ma I should have a 5000ohm cathode resistor.
Bias voltage is the voltage difference between a tube's cathode and control grid. Bias current is the amount of electrons flowing from the cathode to the plate with no audio signal on the control grid (idle current). An amplifier tube controls the flow of electrons running through it.
30 mar 2023 · Here is a good read and explanation of how to measure and set bias in a Tube amp. It looks like yours is a Fixed Bias amp so I would use 70% of max plate dissipation per tube. Some like to use 60% thinking it may extend the tube life. True 5881 tube are about 23-24 watt max. 6l6gc's are 30 watts max plate dissipation per tube. Set your bias ...
As long as you know (or can test) the plate voltage in your amp, and have a way to measure the idle current, you can determine where to bias it, using our calculator. Select your tube type and amp class (Class A, Class AB Low, Class AB, or Class AB High) and enter your Plate Voltage or B+.
