Summit Audio TD-100 Instrument Preamp / Direct Box

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  • Summit Audio TD-100 Instrument Preamp / Direct Box
  • Summit Audio TD-100 Instrument Preamp / Direct Box
  • Summit Audio TD-100 Instrument Preamp / Direct Box
  • Summit Audio TD-100 Instrument Preamp / Direct Box


The TD-100 is a hand-crafted tube Instrument preamplifier and D.I with multiple inputs and outputs including a heaphone output.

The TD-100  features a hybrid signal path utilizing a solid state output device and a 12AX7A/ECC83 vacuum tube. This unique combination of of solid state and vacuum tube technology
gives the TD-100 the benefits of both worlds: the high reliability and long life of solid state and the warm overtones associated with vacuum tubes.

Other great features such as continuously variable input impedance, polarity switching, and a headphone output make the TD-100 a versatile unit for for the studio or the stage.

Studio and stage
Maintain control of your sound in the most demanding audio environments. Get world class sound in the studio and on the road with the time-tested quality and rugged design of Summit gear.

24dB of gain
Plenty of gain for boosting low output instruments and to drive different levels in a rig for tonal variety, with the stepped pot making it easy for you to instantly recall your ideal settings.

Watch your tone, now...
One of the coolest features of the TD100 is its variable input impedance control, which lets you perfectly match it (or intentionally mismatch it!) to a wide variety of instruments and pickups, giving you the flexibility to actually change the sound of your instruments!

Really well built
The Summit Audio design philosophy considers the entire package when it comes to crafting gear. We pay special attention to the details of construction and have included many refinements over the years so units are durable enough to handle the rigors of the road. That is one of the reasons why you will find Summit gear on tour with many of today’s top touring acts around the world.

Hand-crafted in the USA
Each piece of Summit gear is meticulously crafted by hand in our shop using only the best quality components and attention to detail. Quality components and engineering know-how are the critical element to the sound and longevity of audio gear.

Internal power supply
All Summit Audio products sport an internal high voltage power supply using an industry standard IEC connector.

Optional Rack Mount Kit (SRK-100) Available Separately
The TD-100’s half rack design allows you to customize your setup according to your needs.

3 year warranty.
All Summit gear comes with a 3 year limited warranty

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Size and Weight

  • Height:    1.75 inches (4.44 cm)
  • Width:    8.5 inches (21.59 cm)
  • Depth:    8.5 inches (21.59 cm)
  • Weight:    5 pounds (2.27 kg)

Power Configuration

  • Internal AC Supply
  • 20 watts, 115, 50 or 60 Hz (USA model)
  • Fuse size .5 amp, slo-blo for 100/115 V
  • Fuse size .25 amp, slo-blo at 230 V

Impedance Data

  • Input Impedance: 10K-2M ohms
  • Output impedance: XLR: 2K ohms, TRS: 600 ohms


  • Instrument Input: 1/4" Jack
  • Direct Instrument Output: 1/4" -10 dB balanced
  • Outputs: +4 dB male XLR and 1/4" -10 dB balanced
  • Stereo Link: 1/4" mono Jack
  • Headphone Output: 1/4" stereo jack (600 ohms)

Max input level

  • Max input level: +23dBu
  • Max output level: TRS: +21dBu, XLR: +2dBu
  • Max gain: 24dBu

Operating Measurements

  • Frequency response: 20Hz-100kHz -1dB
  • Signal to noise ratio: 140dB
  • THD + Noise: 0.14%, +5dB in, unity gain
  • Vacuum tubes: single 12AX7A
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Additional Information

FREE SRK-100 Rack Kit:
With purchase of any 2 Summit Half-Rack Units!
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