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S-PRE-HP is the "hard parts" form of S-PRE, inlcuding the PCB and tube sockets and kit notes.

If you want just the PCB and kit notes, order S-PRE-PCB instead.

If you want all of the components that mount on the board, plus the pots and jacks, order S-PRE.

See S-PRE for a full description of the S-PRE Spectrum Bass Preamp.

About London Power

London Power was founded in 1990 by Kevin O'Connor, after two decades of research into innovative audio amplification techniques. Kevin is an audio designer, author and speaker, known for his proprietary methodology called Power Scaling, and for his eleven books on audio subjects. Whether you seek amps, kits or information, you'll find useful answers here on not just the "how" but the "why" of audio amplifier design. Please enjoy the information on this site, and don't hesitate to contact us with questions.

Contact Us

(807) 473-0952
11 am - 6 pm, M-F
PO Box 10012, Thunder Bay, ON P7B 6T6 CANADA