Nitewalker PREAMP


The Nitewalker Bass Guitar Tube Preamp is most effective when used with certain combinations of Bass Guitar Pick-ups, Strings, and Amplifiers. Changing the supplied 12ax7 tube for a different brand will allow for more experimentation with tone changes, too. Surprisingly, the type of string used will make the biggest difference.

At this time Nitewalkers are exclusively made to work with 110VAC wall outlets. Special orders for 220VAC wall outlet units are available, but it may take some time to complete the order. This product is not yet CE certified for European use. We are working on it!


input: 100mVrms 200 Hz scope









input: 200Hz at 400mVrms High and Low Frquency Channels distortion shown












input: 200Hz at 400mVrms High and Low Frquency Channels












input: 400mVrms 200Hz scope











input: 600mVrms 200Hz scope











Bias on the outputs at steady state











distortion 100 Hz Low Freq channel











frequency sweep 20hZ to 20kHz at 100mVrms input signal











frequency sweep at 550mVrms input signal











frequency sweep at 630mVrms input signal











frequency sweep normalized to 0db











Gain Low Frequency Channel Orange drop vs PIO











Harmonic Spectrum 1vrms input signal











Harmonic Spectrum 400 mVrms input signal











Harmonic Spectrum 600 mVrms input signal











Low Frequency Channel with Orange drop transient response test












Low Frequency Channel with PIO transient response test












orange drop 50 mVrms freq response test












orange drop 100mVrms freq response test












orange drop 400mVrms freq response test













PIO frequency response 50 mVrms












PIO frequency response 100 mVrms












PIO frequency response 400 mVrms













hand drawn schematic of 12ax7 signal path hand drawn














schematic of 12ax7 signal path














scope 100mVrms 200Hz input











THD+N 0-500 mVrms input











THD+N 1-800 mVrms input












THD+N 250 mVrms 100Hz with overdrive switch in normal position











THD+N 250 mVrms 100Hz with overdrive switch in overdrive position











THD+N Low Freq. 100 mVrms input











THD+N Low Freq. 400 mVrms input











THD+N Low Freq. 600 mVrms input











THD+N Low Freq channel











transient response: high freq. and low freq. channels compared in production Nitewalker Bass Guitar Tube Preamp













If you would like to read a comprehensive report that has been prepared about these results please click here.

Tom Lees, who authored these audio engineering results, wrote an Article in Issue 7 of Bass Gear Magazine entitled, “A Technical Look at the Nitewalker Bass Guitar Tube Preamp”. Click here to see Issue 7.



Nitewalker Bass Guitar Tube Preamps



WARRANTY warrants to the original end-user purchaser only that the product will be free of defects in materials and workmanship for a period of 5 years from the date of purchase.

Should there be a material or workmanship defect during the Warranty Period, the end-user purchaser shall contact Newbasstone, Inc. to arrange for the return of the item. The end-user purchaser will be responsible for all efforts and costs incurred in transporting/mailing/shipping/insuring the defective item(s) to and from the manufacturer. A copy of the dated receipt/invoice should be enclosed in the return package.

What This Warranty Does Not Cover

Specifically, this warranty does not cover failures of the product which result from accident, abuse, misuse (including but not limited to connection to incorrect voltages or power points), alterations (by persons other than Newbasstone, Inc.), moisture, corrosive environments, shipping, high voltage surges, or abnormal working conditions (including but not limited to lightning and water damage) after purchase. In no event will Newbasstone, Inc., incur liability or damages to you, or any other person, exceeding the purchase price you paid for the product, regardless of the form of the claim. Failure of the 12AX7 tube is not covered by this warranty.

NOTE: This warranty gives you specific legal rights. You may have other rights which vary from country/state to country/state. Certain limitations in this warranty are not permitted by the jurisdiction of some countries/states, so some limitations may not apply to you.



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