but using those to find fault in a circuit built for learning is beside the point. He demonstrated it in use, and even goes as far as to show it running an audio power amplifier driving a small ...

It’s a conventional tube amplifier circuit in which the triode is a preamplifier for the pentode power output stage. The pentode is running in class A mode, and the high impedance of its output ...

It’s best known for its high-end audio equipment, including reel-to-reel machines, cassette tape decks and amplifiers. Now, the company has introduced a gorgeous and compact stereo power amplifier to ...