The design is inspired by the guitar amps of the 1950s and ... single-ended one with a two stage double triode preamp and a single power output tube. The transformers are usually the difficult ...

[Justin Scott]’s tube preamplifier is a great example, with its novel use of a pair of Nixie tubes to indicate the volume to which it has been set. The audio side of the preamp comes courtesy of ...

Solid-state tube replacements are innovative devices that can act as a substitute for traditional tubes in your guitar amplifier ... the sound and response of preamp tubes like the 12AX7.

Greek pedal maker Crazy Tube Circuits has unveiled ... that promises to nail Angus Young’s guitar tone. But, to go one step further, it also boasts a preamp and an additional dynamic enhancer ...