Akashic Guitar effects PCB lookup
BLENDDRIVEERALEVEL

125B · 4 knobs

PCB Guitar Mania

Black Mirror Bass Tubes

Based on the Darkglass Vintage Microtubes

Category
Overdrive· Bass Overdrive
Controls
Blend · Drive · Era · Level
Difficulty
Advanced
Price
€11.90out 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

Nothing beats the sound of a bass guitar roaring through a tube amp… well, almost nothing, as a pedal designed to emulate this experience might be just what your signal chain is missing.

Introduction

The Black Mirror Bass Tubes is a bass tube preamp captured in a very compact design. This Darkglass Vintage Microtubes-inspired pedal allows you to choose from classic bass tones, starting in the early 70s, passing through the 80s, and finishing on the 90s rock sounds.

This little device comes with 4 controls: BLEND, LEVEL, DRIVE and ERA.

The BLEND knob lets you mix your clean tone at the unity gain with the overdriven tone.

The LEVEL potentiometer allows for further control of only the volume of the overdriven signal to finetune your preferred sound further.

DRIVE is your standard knob that dictates how much saturation your tone should have. It goes from barely present to a tube pushed to its limits.

We have saved the best for the dessert – the ERA control. With this pot, you can decide what kind of flavor your overdrive will have. Set it to minimum and you’ll be taken back to the 70s, with the characteristic warm mid-range tones, while turning it clockwise will time travel you through more metallic sounding 80s, up to 90s rock sounds at the end of the dial.

As much as we all love the classic sound of a tube amp, it’s not always the most reliable equipment to carry around dodgy clubs that you’ll be playing in. Save some space on the stage with Black Mirror Bass Tubes – trust us, your back will thank you too!

Controls

• BLEND

• DRIVE

• LEVEL

• ERA

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.

Black Mirror Bass Tubes – Building Docs

Black mirror bass tubes – 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 71 rows

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Resistors 33
R3010K10k
R3110K10k
R11M1M
R3310K10k
R21M1M
R3422K22k
R310K10k
R4100K100k
R51M1M
R61M1M
R71M1M
R83K33.3k
R92M2M
R10470K470k
R1110K10k
R1222K22k
R1320K20k
R14300K300k
R15470K470k
R161M1M
R17220K220k
R183K33.3k
R1910K10k
R2020K20k
R21330K330k
R2210K10k
R231M1M
R24100K100k
R2510K10k
R2622K22k
R27100K100k
R281K1k
R29100K100k
Capacitors 24
C22100u100u
C23100u100u
C1100n100n
C222n22n
C322n22n
C4220n220n
C5220p220p
C622n22n
C722n22n
C822n22n
C9100n100n
C10220p220p
C11220n220n
C12220n220n
C13220p220p
C141u1u
C151n1n
C164n74.7n
C171n1n
C181n1n
C192n22.2n
C201n1n
C211u1u
C241u1u
Diodes 4
D11N41481N4148
D21N41481N4148
D31N58171N5817
D43mm3MM
Transistors 2
Q1J201J201
Q2J201J201
ICs 3
IC1TL072TL072
IC3TL074TL074
IC4CD4049UBECD4049UBE
Potentiometers 4
BLENDB100KB100kPotentiometer
DRIVEC100KC100kPotentiometer
ERAB100KB100kPotentiometer
LEVELA100KA100kPotentiometer
Jacks & sockets 1
J201Q1Q1