6BX7 10W bile duct amplifier ----- 6bx7 Vacuum Tube amplifier

6BX7 10W amplifier bile duct, 6BX7 Vacuum tube amplifier Keywords: 6BX7, amplifier circuit diagram Recently, the people in the South sent me the vacuum tube and some "antiques" contraced components that have been slept for many years, let me dress up the power and amplifier. This is a few vague writing vacuum tube with a magnifying glass carefully identified, and finally identify are ECL82,6BX7 and 6x5. ECL82 three, pentode, for oscillating field in the 1960's television tube, the triode part of the high voltage amplification μ tube portion is a power pentode tube. 6BX7 is a dual power triode tubes, tubes for television field output. 6X5 is indirectly heated oxide cathode of the rectifier diode, and the common parameters 6Z4 substantially the same, but different pin arrangement order. The triode ECL82 as preamp, which load resistance value larger plate (270kΩ), more than 60dB gain, fully meet the requirements of the modern variety of sources. Pentode form of triode section, divided as D ~ K inverter, to ensure sufficient drive voltage output at low impedance load, the inverter stage about 5% negative feedback. Dynamic range, output level, distortion are very good. Adaptation drive low μ, low internal resistance of the transistor power output stage. 6BX7 high transconductance, low resistance dual power triode tube having plate is small, suitable for amplification type AB1. The characteristics of the pressure plate, when the plate voltage is 305V, the negative pressure of -28 gate, the output power of about 10.5w at AB1 class-A operation. Electrode plate between the plate and load impedance 8kΩ, consumption of each transistor plate 6w. The entire circuit is added about -10dB negative feedback, and slightly decreased input sensitivity. Using two power transformers, power is 70W. T1 tongue 26mm wide, 45mm thick laminated silicon steel quality, with the primary winding enameled Φ0.29mm 825 turns, secondary winding 1200 turns of enameled wire with Φ0.21mm, G1, G2 with the filament voltage turn Φ1.08mm enameled wire 24, filament 6X5 voltage supply alone. T2 is finished secondary output 24V 30W transformer, bridge rectifier negative output 68X7 gate voltage -28V. Adjustment W2, w3 stable negative output voltage. Coupling capacitance in the circuit, and both ends of the mica capacitor 0.047μF, help enhance the treble. Author: 福 福

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