Akashic Guitar effects PCB lookup
BOOSTGAINMIDSVOLUMEBASSTREBLE

1590BB · 6 knobs

PCB Guitar Mania

Doctor Trebor

Based on the Aclam Dr. Robert

Category
Overdrive· Classic Preamp
Controls
Boost · Gain · Mids · Volume · Bass · Treble
Difficulty
Advanced
Price
€14.90out 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

Introducing Dr. Trebor, the affordable way to experience the Vox UL730 Amplifier!

I don’t know about you, but I’ve never got the chance to try the real thing, and I probably could never afford one. That’s a pity because the Legendary Vox UL 730 can be heard beautifully used by the Beatles, Rolling Stones, The Who, Jimmy Page, and many other legends.

The solution? It’s called Dr. Trebor, an uncanny replica of the original that ensures great sound quality at an unbeatable price.

Introduction

Since I was young, I’ve been captivated by the Beatles’ dreamy guitar sounds. Just listen to Revolver, Sgt. Pepper’s and Magical Mystery Tour, and you will know exactly what I’m talking about.

The liable for those unique sounds? A series of Vox Amps’ hybrids and solid-state models that were used not only by the Beatles but also by many other superstars at the time.

You may say I’m a dreamer, but I’m not the only one, because many like me would love to have one of those amazing amps in their hands at all costs! Well, that may be an exaggeration if we consider that the originals can go over €12,000.

“Don’t let me down,” you may be thinking at this point, and don’t worry, I won’t because here comes the sun:

It turns out that some very driving people at Aclam Guitars, Barcelona, encountered one of these rare amps and spent the best part of a year recasting its magic into a pedal which they appropriately called Dr. Robert. It’s a lot of fun, very authentic sounding that makes you twist and shout just by hearing it!

Inspired by that amazing pedal, our Dr. Trebor also encapsulates the shared sonic attributes of the Vox amps of that period. You can nail all those acclaimed tones with a simple but effective control set. Just connect the pedal and enjoy while your guitar gently weeps.

The board is as unique as the amp it’s inspired. On the UL730, Vox separated the midrange control from the rest of the EQ stack, situating it before the volume pot and upstream from the bass and treble controls. Dr. Trebor’s guts are wired similarly, which means that the midrange shapes the pedal’s tone and gain profile profoundly before interacting with an amplifier’s bass/treble tone stack.

So, what are you waiting for? Now is your time to take a sad song and make it better. And remember, “all you need is love,” but if you also have an affordable Vox UL730 Amplifier in a box, much better!

Controls

Potentiometers

• Bass

• Bass-P

• Gain-B

• Treble

• Treble-P

Swit

Schematic

The schematic is in the vendor's build document, page 6. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 83 rows

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RefValueNormalizedTypeNotes
Resistors 40
R3710k10k
R3810k10k
R133k33k
R391m1M
R227k27k
R401k51.5k
R3100k100k
R410k10k
R5348k348k
R622k22k
R73k33.3k
R818k18k
R910k10k
R1018k18k
R1147k47k
R1210k10k
R1312k12k
R14220k220k
R1527k27k
R1633k33k
R171k51.5k
R18470r470
R19220r220
R20150r150
R211k1k
R224k74.7k
R231m1M
R241m1M
R2510r10
R265m10.0051
R2768k68k
R2827k27k
R291m1M
R301m1M
R3115k15k
R325m10.0051
R3357k57k
R3436k36k
R354k74.7k
R364k74.7k
Capacitors 24
C122n22n
C41u1u
C522n22n
C647n47n
C722n22n
C83n93.9n
C1322n22n
C15820p820p
C168n28.2n
C1810n10n
C1933n33n
C210u10u
C347u47u
C910u10u
C1010u10u
C11100u100u
C1210u10u
C142u22.2u
C1710u10u
C2010u10u
C2110u10u
C22100u100u
C2310u10u
C2410u10u
Diodes 3
D11n58171N5817
D41n58171N5817
D51n58171N5817
Transistors 7
Q12n2222s2N2222S
Q22n2222s2N2222S
Q32n2222s2N2222S
Q42N54572N5457
Q52N54572N5457
Q62N54572N5457
Q72N54572N5457
ICs 1
IC1LT1054LT1054
Potentiometers 6
BOOST500KAA500kPotentiometer
GAIN250KAA250kPotentiometer
MIDS25KAA25kPotentiometer
VOLUME500KAA500kPotentiometer
BASS250KAA250kPotentiometer
TREBLE5KCC5kPotentiometer
LEDs 2
LED23mm3MM
LED1isIS