Circuit hybrid power amplifier Tube 16W
About 35 voltage gain of the 6SL7, 6SN7 provide about 800 ohm output impedance is low, easy enough and low enough to ensure that a wide range of bandwidth.
The output stage has senior power
MOSFET BUZ901 and the BUZ906, they are demonstrated near linear transfer function and the low side of the gate-source voltage of the MOSFET. Yes, there is a large output coupling capacitors, but I tend to think that such an arrangement may be superior to a bipolar power, direct coupling method, if no other reason than the more secure and output coupling capacitors is so obvious the signal path, very few people will see the importance of the signal chain.
Why only 16 watts of
power MOSFET can provide another amplifier 100 watts or more simple? A-level as well. It provides the lowest distortion and flattest output impedance. However, like most worth having, it is not cheap. 16-watt amplifier running 1.1A standby current in each output to dissipate 22 watts of idle (much lower than the DC safe operating limit) device results.
16 watts seems ridiculous to you, then you can convert the amplifier, Class AB and dual power supply voltage is 80 volts, which will produce a simple 60-watt output. This change need to change the output level of the voltage reference, the careful adjustment is essential.