A Versatile DI
The Demeter Amplification HDI-1 – Direct Line Driver is a versatile new addition to the Demeter line of professional tube audio equipment. Demeter Amplification, the originator of the first commercially available Tube Direct Box has taken the technology to a new level with this innovative product incorporating the same tube driven ultra high impedance input (27 megohms) found in the original Tube Direct (to prevent instrument pickup loading) and a new balanced line level output section. The unit can be used as both line level direct instrument input or as a line level driver to add tube warmth to line level digital interfaces.
Specifications:
- Input impedance: 27 megohms
- Output impedance: 50 Ohms
- THD @ 1 kHz: .035% unity, .081% boost
- Bandwidth: 20 Hz to 20 kHz
- Signal to noise: – 98 dB
- Gain: 20 dB/unity
- Output: @ 600 Ohms +28 dB
- Tubes: 2 12AX7a
- Outputs: TRS 3-pin rear, 1/4″ mono front
- Operating voltage: 230/115 V AC





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