Instead of buying a vintage stereo tube amp, he decided to build his own using the guts of a Heathkit AA-100, a popular tube amp from the 60s and 70s that doesn’t have a great reputation for ...

The design is inspired by the guitar amps of the 1950s and ... preamp and a single power output tube. The transformers are usually the difficult part of a build like this one, and here instead ...

Compact tube amp accessory lets players carefully select their desired voltage, promising both tonal and functional results ...

The latter appealed to tinkering audiophiles building their own amplifiers ... the Dynaco ST-70 was a low-powered tube amp.

The K2-W vacuum-tube op amp has an LTspice-simulated open loop ... and the usual benchtop instruments; build a simple test jig; make the measurements; and see what we can learn!