FX Audio TUBE-03 Preamp Buffersearch

FX Audio TUBE-03 Preamp Buffer

FX Audio TUBE-03 Preamp Buffer

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Budget-Friendly Preamp Buffer

An inexpensive addition to your hi-fi system, the FX Audio TUBE-03 aims to add a pleasant amount of color and warmth to your music. Compared to a previous model, the TUBE-01, this preamp buffer features new bass and treble dials that allow you to fine-tune the sound to suit your preferences. The front panel has a toggle on-and-off switch and a large volume knob, and on top you’ll find a pair of 6J1 tubes that can easily be replaced with other tubes to achieve a different sound signature.

Note: At checkout, choose black or silver.


  • FX Audio
  • Tubes: 2 x 6J1
  • RCA line output: 0.9 Vrms
  • Signal-to-noise ratio: 98 dB
  • Distortion: 0.3%
  • Tweeter adjustment range: +/- 6 dB
  • Bass adjustment range: +/- 10 dB
  • Frequency response: 20 Hz–20 kHz
  • Input: RCA
  • Output: RCA
  • Operation: Toggle switch and front panel volume control
  • Power supply: DC 12V 1.5A
  • Dimensions: 4.6 x 3.9 x 1.1 in (118 x 98 x 28 mm)
  • Weight: 12.3 oz (350 g)


All orders will be shipped by Massdrop.

Estimated ship date is Sep 10, 2018 PT.

After the drop ends, payment will be collected and the group’s order will be submitted to the vendor up front, making all sales final. Check the discussion page for updates on your order.