PA1 JB Onboard Preamp (E1012) - Guitar Hardware -Dein Gitarrenteile und Griffbrett Shop
Active Circuit Onboard Effects, QTB ~ Quadra Tone Booster Driver
Fun with Onboard Boosters! - tonefiend.com
Artec Onboard Mod - Active VTC Overdrive
Anyone here build a treble boost circuit into their guitar? | The Gear Page
GFS Onboard Guitar Enhancer Preamp Booster, DOD 250 | Reverb
Artec QTB, 4 Step Clean Boost On Board Circuit for Electric
Activator 2 - A DIY onboard JFET preamp kit for guitars and basses
Aguilar OBP-3SK/PP Onboard Active Bass Guitar Preamp Kit
Dual Boost" two switch Onboard Mid Boost/Frequency Expander
Demeter MID Boost/Fat Control Onboard Guitar Device
Paul In The Lab: Onboard Guitar Preamp Drive Stripboard Veroboard Layout
East UK Uni-Pre Onboard Preamp | Bass Gear Magazine
Blaster Boost Mod Kit — Mythos Pedals
Guitar Pre-Amp Multi Effects - Ironstone Electric Guitar Pickups
BECOS FX Micro Booster MK4 Onboard Guitar Preamp with Push-Push Switch-Pot, 250K (for Single Coil) | guitar pedals for any genre
Onboard Preamp- Clapton Mid Boost, Brian May Treble Boost, C
Simple OnBoard JFet Preamp for Piezos – Cigar Box Nation
Active Onboard Guitar Preamp - EQ-Boost (Based on VSC-3) - AnalogWorkshop | eBay
Aguilar OBP-3TK 3-band Boost/Cut Onboard Bass Preamp with Toggle | Sweetwater
K-Boost - RSD Sound
Psycho Knob Board - Internal Distortion/Boost/Overdrive for Guitar or Amp - now with pre-wired leads! - C. B. Gitty Crafter Supply
Micro Booster MK3 Onboard Guitar Preamp with Push-Push switch-pot… – BECOSFX
