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Fixed Bias Analysis. I modeled the 5F6A tweed Bassman's fixed bias circuit to see how changing voltages and component values affected its voltage output, capacitor charging time and ripple removal. I really learned a lot about how the circuit works by looking at the AC, DC and ripple waveform plots as they move through the circuit.
The input transformer provides a balanced input signal for two tube-based amplifiers that drive the solid-state output stage. The tube amplifier probably consists of two grounded-cathode amplifiers in DC cascade, as the two feedback loops require a non-phase-inverting drive signal for the MOSFETs.
Class-A amplifiers are the best candidates for an auto bias circuit, as the average of the current flow equals the idle current. For example, an output tube biased in class-A might experience a dynamic current swing of +200mA down to 0A, with an average value of 100mA, the same value as its idle current.
22 sty 2024 · The green highlight shows the AC signal paths. First from the source, through grid leak resistor RG to ground and back to the source. It is my understanding that no current flows in grid stopper RS or the ground between RS & RK, but feel free to correct me on that point.
1 lut 2020 · A blog series explaining in detail how a single-ended tube amplifier circuit works using the AE1 Kit circuit.
19 lip 2015 · We continue with simple tube-based input stages for use with inverting chip power amplifier, such as the LM3886; think fancy gainclone amplifier. If you thought that I had exhausted all the possible tube-based circuits with my last post, you are not alone, as I thought I had as well.
23 lut 2023 · Part 3 – Circuit Analysis. 1 / 4 • 1st preamp stage Circuit analysis. 1st Preamp Stage. The AX84 uses just two tubes, a 12AX7/ECC83 and an EL84. But since the former is a dual triode, there are three tube stages in total.
