Akashic Guitar effects circuit lookup
VOLUMEDRIVETREBLEBASS

125B · 4 knobs

PCB Guitar Mania

Svenson Preamp

Based on the Benson Preamp· 7 other boards clone it

Category
Overdrive· Preamp overdrive/boost/fuzz
Controls
Volume · Drive · Treble · Bass
Difficulty
Intermediate (Requires Biasing
Price
€9.90out of stock

Heads up Builders widely report inconsistent quality from PCB Guitar Mania boards, and whether a given board works is a gamble. Read recent forum reports before ordering.

From the vendor

Project overview

This JFET preamp overdrive/distortion/fuzz is a Benson Chimera 30 Watt amplifier inside a box that has it all. It delivers a clean boost, soulful-bluesy overdrive, and even fuzz and distortion; all this versatility reached effortlessly.

Introduction

The Svenson Preamp is a circuit that captures the Chimera amplifier soul by substituting vacuum tubes for JFET transistors, like we have seen in many other preamps in a box or in Wampler Plexi.

This circuit is a jack of all trades, so better be ready to have all in one pedal: this circuit adds thickness to your tone and gives a blues drive-like sound without going to metal. Enriches your sound by incorporating harmonics and a very musical EQ into your signal chain. Delivers rusty overdrive/distortion waves while maintaining all your guitar’s original character. All of this, with the ability to dial effortless in the exact feature you want!

Controls

• Drive

• Treble

• Volume

• Bass

For further analysis on this circuit take a look at this thread on Free Stomp Boxes Forum.

For any technical questions regarding this build don’t forget to check out our Facebook Group and our forum at Free Stomp Boxes.

Svenson Preamp – Building Docs

Svenson Preamp – Drilling Template

Schematic

The schematic is in the vendor's build document, page 5. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 40 rows

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RefValueNormalizedTypeNotes
Resistors 14
R10100k100k
R610k10k
R910k10k
R1210k10k
R41k1k
R81k1k
R111k1k
R11m1M
R31m1M
R2220k220k
R5470k470k
R7470k470k
R1347k47k
R144k74.7k
Capacitors 12
C1100n100n
C12100n100n
C222n22n
C622n22n
C822n22n
C922n22n
C3250p250p
C102n22.2n
C4470p470p
C11100u100u
C510u10u
C710u10u
Diodes 1
D01n58171N5817
Transistors 6
Q1J201J201
Q2J201J201
Q3J201J201
Q1BSST201SST201
Q2BSST201SST201
Q3BSST201SST201
Potentiometers 4
VOLUME100k AA100k
DRIVE1M AA1M
TREBLE250k AA250k
BASS1M BB1MDual
Trimmers 2
TRIM150k50k
TRIM250k50k
LEDs 1
LED3mm Red LED3MM RED LED

Other boards based on the Benson Preamp