Reading an article about the first transistorized Hi-Fi amplifier ... isn’t the first Radio Shack kit that [Netzener] has adapted. Check out his single tube radio and classic neon “Goofy ...

Once a discarded relic, over the years the humble vacuum tube ... too high to drive a set of headphones. An NE5532 steps in for the op-amp buffer role, making for a very simple circuit. Power ...

First made in 1959, this is the best-selling tube amplifier ... standard way of rating amplifiers’ power levels. But the ST-70 has remained popular among vintage hi-fi enthusiasts.