Line Pre-Amp


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The Specimen Line Pre-amp provides a rock solid foundation for a larger sound system.   This preamp unit uses a famous old twin triode, known under different hats as the 5998, 6AS7, 421A, 2399.  Two 6L6s are used as a constant current source load. The circuit allows four different line inputs to be conveniently switched in front of any of our power amps.

It provides a voltage gain of 1.92 to 3.96 depending on which tube you use, to provide a more solid foundation and a bit more volume from the power amps. A 19″ deep shelf or table surface is ideal to combine Specimen Products whole line of audio components.

  • Circuit

    Single-ended triode driven constant current source stereo line pre-amp

  • Tubes

    5U4, two 6L6Gs, 6AS7 (or 5998, 421A, 2399)

  • Inputs

    4 RCA inputs

  • Dimensions

    16" deep x 11" wide x 8" high

  • Weight

    20 lbs.

Specimen Custom Line Pre-Amp
Specimen Custom Sound System