The Bartolini NTBTG 2-Band EQ Tone Control Pre-Amp. The NTBT-918 is a tone control preamp with fully independent Bass and Treble controls with very low noise and wide boost/cut range. It is 2/3 the size of a 9v battery. The sound is very clear and transparent. Distortion is well below 0.001%. This preamp can be used with either 1 – 9 volt battery ( 9 volt operation) or 2 – 9 volt batteries (18 volt operation) which yields 6 dB extra headroom. In 9 volt operation the NTBT-918 uses approximately 750 microamperes of current from 1 – 9 volt battery. This means 1 month of continuous duty or more than 6 months of average usage. In 18 volt operation the NTBT-918 uses approximately 1000 microamperes of current from 2 – 9 volt batteries. This means more than 3 weeks of continuous duty or more tha.
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