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.


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.


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

Related Tube Preamplifier Projects:

• Mark's build of the DIY 12AX7 Tube Preamplifier Kit
• Bruce's build of the DIY 12AX7 Tube Preamp Kit
• Alan's simple DIY 12AX7 / 12AU7 Tube Preamplifier
  

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