Schematic tube Power amplifier 3 watts

3 Watt Amps

These two power amplifiers are almost identical except for the brand of power transformer. Tubes used are 6BM8 and 6X4. Output power is about 3 watts into 8 ohms. The output pentode is connected to a 40% ultra-linear tap on the output transformer.


Tube circuitry uses lethal amounts of current at high voltages. Be extremely careful when constructing any types of tube circuitry. Here are some tips for building circuits safely:

When testing circuits, do not stand on metal or anything grounded.

When measuring voltages in the circuit, use only one hand.

Never work on a circuit while it is plugged in.

Discharge filter capacitors through a resistor after turning off the circuit.

Wait for tubes to cool before handling or removing.

Use common sense and don't do anything stupid.

Note: I am not responsible for injury or death as a result of carelessness in the construction of the circuits on this site.

Download File schema HERE