Boost1968· Electro-Harmonix (USA)
Electro-Harmonix LPB-1 Linear Power Booster
One transistor, one knob — the simplest clean(ish) boost in the world.
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Schematic pending verification
We don't ship reference schematics until they've been hand-authored against authoritative sources (manufacturer service docs, ElectroSmash analyses, GEOFEX writeups) and reviewed in the simulator. Until then, the BOM, signal chain, controls and mod notes below are accurate, and you can still add this pedal to a project — it just won't include a circuit yet.
About
A single 2N5088 common-emitter stage with a volume pot at the output. Boosts signal by up to ~26 dB to hammer the front end of a tube amp into natural breakup.
Signal chain preview
3 stagesInput
Input cap → Q1 base
Q1 common-emitter (2N5088) with collector resistor + bias network
Output cap → Volume pot → Output
Output
Quick facts
- About a dozen parts — a perfect first DIY build.
- Drives tube amps into power-amp distortion without changing tone much.
- Slight high-end emphasis from the small input cap.
Controls
- Volume (100k log)