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BASSGAINMIDTREBLE

125B · 4 knobs

PCB Guitar Mania

Tweed Bassman 59

Based on the Fender Bassman pre amp· 1 other board clones it

Category
Overdrive· Pre amp Emulator
Controls
Bass · Gain · Mid · Treble
Difficulty
Average
Price
€11.90out of stock
Tags
diy-originals

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

The Tweed Bassman 59 emulates part of a series of preamps in a box, emulating the tone of some of the most iconic amplifiers.

For this occasion, we have not only the preamp section, but we have also included the tone stack and the power section of this all-time classic.

Introduction

The Fender 1959 Bassman was originally designed (as the name says) to be a Fender’s first dedicated Bass Amplifier that delivers a lot of volume without getting distorted. Over the year, guitar players started to fall in love with it as well because of its massive headroom that provides you with the famous F-cleans, and that’s one of the reasons it’s being built with a short time out from 1951 till now. Bajaman did a great job emulating this amplifier’s preamp, and we made a pcb for you to join the party.

Because the EQ is a massive part of the overall tone, it’s included in the pcb, as well as the power section after it, so prepare yourself cause this little thing can get pretty loud!

Side note 2.5nf are pretty hard to source. You can use a 2.7nf and still have more than just decent-sounding emulation of the amp, and it works best in the return of an FX loop. But I still had great results to shape a clean channel when used in front of my amps.

Controls

Potentiometers

• Gain

• Presence

• Bass

• Mids

• Treble

• Volume

Switches

• Bright switch

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

Tweed Bassman 59 1v1 – Building Doc

Tweed Bassman 59 – Building Docs

Tweed Bassman 59 – Drilling Template

Schematic

The schematic is in the vendor's build document, page 7. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 55 rows

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RefValueNormalizedTypeNotes
Resistors 23
R11M51.5M
R21M1M
R3100K100k
R41M1M
R53K33.3k
R62K72.7k
R73K33.3k
R81K81.8k
R92K72.7k
R102K72.7k
R113K93.9k
R12180K180k
R135K65.6k
R14120R120
R15680R680
R162K72.7k
R173K93.9k
R1818K18k
R192K22.2k
R201M1M
R211K1k
R2210K10k
R2310K10k
Capacitors 19
C11u1u
C2100n100n
C31n51.5n
C5220n220n
C61n1n
C71n1n
C92n52.5n
C101u1u
C111u1u
C12560n560n
C13220n220n
C14680n680n
C151u1u
C16330p330p
C171u1u
C181u1u
C447u47u
C810u10u
C191u1u
Diodes 6
D01N58171N5817
D13mm3MM
D21N41481N4148
D31N41481N4148
D41N41481N4148
D51N41481N4148
Transistors 1
Q1J201*J201
ICs 2
IC2TL062TL062
IC3TL062TL062
Potentiometers 4
BASSB50KB50kPotentiometer
GAINB100KB100kPotentiometer
MIDB1KB1kPotentiometer
TREBLEB10KB10kPotentiometer

Other boards based on the Fender Bassman pre amp