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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.
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+.
The 6L6GC is a type of beam power tube employing a beam-confining electrode at cathode potential in place of an actual suppressor grid. The Measured Voltage Gain Test Setup. Each tube sample was installed in the same custom built, fixed bias single-ended guitar amplifier (see schematic) with a Fender black face style preamp circuit.
6L6GC Author: General Electric Subject: JA-FP-2000-12-26 Created Date: 12/26/2000 5:57:20 PM ...
