01 March 2007

DIY 5687 Tube Preamplifier

The latest addition to the DIY Audio Projects website is a fine looking tube preamplifier constructed by Vincent Wong. The tube preamp is based around a pair of 5687 twin triodes. Each channel uses both sections of a 5687 tube and LED biasing is used on each section.

DIY 5687 Tube Preamplifier Project
To keep hum at a minimum, the filaments are heated using DC. The power supply is external to the preamp section and consists of a RCA-83 mercury rectifier and two 50H chokes.

DIY 5687 Tube Preamp Project
For more project details including schematics and an enclosure construction guide, see: DIY 5687 LED Biased Tube Preamplifier.

Related Tube Preamplifier Projects:

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