A few years back, [Gio] decided to try his hand at building a couple of tube amplifiers ... The second amp was built to test the performance differences between Pentode-mode and Ultra-Linear ...

For the electronics enthusiast a tube audio amplifier makes for an interesting ... It follows a so-called ultra-linear circuit, with a tap on the output transformer feeding one of the pentode ...

First made in 1959, this is the best-selling tube amplifier of all time. Every product is carefully selected by our editors.