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 ...

There’s a mystique among both audiophiles and musicians about vacuum technology, thus having a tube amp still carries a ... it’s not for audiophiles. The circuit is a pretty conventional ...

It was inspired by the iconic BK Butler Tube Driver, and as such, it really is a crazy tube circuit featuring an actual vacuum tube under ... much like a guitar amp. There is a three-band EQ.