6V6 6J5 Class A Vacuum Tube (Valve) Amplifier Circuit

Posted on Feb 7, 2014

This is my first successful vacuum tube project. The output of this small amplifier in which a 6V6GT output pentode is connected as triode is about 4. 5 watts. This project involves a single ended audio amplifier, which consists of a resistive input network, a driver stage, and an output stage to a typical 8 ohm loudspeaker load, all the while, us

6V6 6J5 Class A Vacuum Tube (Valve) Amplifier Circuit
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ing a minimum of supportive passive components for biasing and coupling duties. Power-supply voltage is provided by full wave diode rectification of 230 VAC by a magnetic transformer. This design provides a quality audio amplifier. The major factor involving the design of this single ended output stage is matching an available output tube to an available output transformer (OT), which can provide the proper impedance matching. Using typical operating parameters, the 6V6 power tube, operating in triode mode, has an ideal load impedance of 5k Ohm, and generates about 4. 5 watts of power. An OT was used, handling 8 watts and providing impedance matching from a 5k primary to an 8 ohm secondary, which is a common loudspeaker impedance. The amplifier uses a simple linear power supply to develop 300VDC. Heater voltages are supplied directly from the 6. 3VAC taps on the secondary of the power transformer. The other secondary windings, rated at 230VAC are used for the DC supply. It consists of a 4 rectifiers, variety of smoothing capacitors and resistor. Several construction issues were considered in the building of this amplifier. High power supply voltages, large and leaky inductive components, and high temperatures are among these considerations. I used old tube amplifier chassis. Magnetic flux is expelled from the transformers as shown by the red arrows above. By placing the output transformer (OT) and power transformer (PT) at...

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