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GLADIATOR DUAL DRIVE

2

TABLE OF CONTENTS

1

Project Overview

8

Drill Template

2

Introduction & Usage

9

Enclosure Layout

3-5

Parts List

10

Wiring Diagram

6

Build Notes

11

Wiring Diagram (no send/return loop)

7

Schematic

12

Licensing & Document Revisions

INTRODUCTION

The Gladiator Dual Overdrive is based on the King Tone Duellist, a highly prized dual pedal first released 
in 2015 consisting of the “String Singer” for side A and the “Heavy Hand” for side B. The Duellist was 

traced by Aion FX

 in 2022.

The String Singer is based on a stripped-down Tube Screamer with input & output buffers removed. The 
circuit is highly modified, so the EQ and clipping will sound drastically different from the classic Ibanez 
circuit, but that was the source at least. This half of the circuit was released in single-pedal format as the 
Soloist, available from Aion FX as the 

Gladius

.

The Heavy Hand is based on the Marshall Bluesbreaker, but again it has been heavily modified from the 
original circuit—so it may remind you of it, but it’s not going to sound quite the same. This half of the was 
also released as a single pedal called the Heavyhand, available from Aion FX as the 

Xiphos

.

Each side also has an external “EQ” toggle switch to select between different EQ voicings, as well as two 
internal DIP switches for fat EQ and asymmetrical clipping (side A) or and asymmetrical clipping and 
hard clipping (side B).

The Gladiator simplifies the send/return functionality of the original unit by including 4 jacks by default. 
The send & return now have their own jacks that automatically short together if nothing is plugged in. 
Otherwise, the Gladiator is a direct clone of the Duellist based on our own trace. Details are available in 
the 

tracing journal

 on our website.

USAGE

The Gladiator has four external controls per channel:

• 

Drive

 controls the amount of gain going into the op-amp feedback diode clipping stage.

• 

Tone

 controls the treble response of the channel via a passive filter.

• 

Volume 

controls the overall output of the channel.

• 

EQ

 (toggle) selects between Fat (more bass), Stock (balanced), and Glass (more treble) modes.

In addition, each channel has two internal controls by way of DIP switches:

• 

Asymmetric

 (both channels) adds a clipping diode in series. Engaged when DIP switch is off.

• 

Warmth

 (side A only) adds an extra treble-cut capacitor. Engaged when DIP switch is on.

• 

Hard Clip

 (side B only) enables the hard clipping diodes. Engaged when DIP switch is off.

Summary of Contents for Gladiator Dual Drive

Page 1: ...ERSION King Tone Duellist A popular dual channel overdrive first released in 2015 that combines a stripped down Tube Screamer with a hot rodded Bluesbreaker Dual channel overdrive 1 0 1 2022 05 23 BUI...

Page 2: ...Heavyhand available from Aion FX as the Xiphos Each side also has an external EQ toggle switch to select between different EQ voicings as well as two internal DIP switches for fat EQ and asymmetrical...

Page 3: ...l film resistor 1 4W R13 133k Metal film resistor 1 4W R14 30k1 Metal film resistor 1 4W R15 28k7 Metal film resistor 1 4W R16 4k7 Metal film resistor 1 4W R17 10k Metal film resistor 1 4W R18 220k Me...

Page 4: ...or 7 2 x 2 5mm C17 4n7 Film capacitor 7 2 x 2 5mm C18 100n Film capacitor 7 2 x 2 5mm C19 4 7uF Film capacitor 7 2 x 7 2mm Electrolytic capacitor in original See build notes C20 10n Film capacitor 7 2...

Page 5: ...Original uses 100kB but audio taper provides better control VOL B 100kA 16mm right angle PCB mount pot Original uses 100kB but audio taper provides better control EQ A SPDT cntr off Toggle switch SPDT...

Page 6: ...s is a modification that is not in the original Duellist This loop automatically shorts together if nothing is plugged in so it s fully backwards compatible if you don t use this feature However if yo...

Page 7: ...10n 10k 100n 220k 5k6 1k 10n 9 53k 10n 1uF GND2 VC VD VD VD VD VD 4k7 15n VD VD 4n7 GND2 47k 47n 4k7 VB 3k3 100n 20k VB OMIT 220n VB VB 220n OMIT 220R 10k VB 1k GND 4 7uF R29 LED A D1 A2 A3 A1 B2 B3 B...

Page 8: ...E B EQ B EQ A CHANNEL B CHANNEL A 1 4 1 4 x 0 575 y 0 01 x 0 575 y 0 01 DRILL TEMPLATE Cut out this drill template fold the edges and tape it to the enclosure Before drilling it s recommended to first...

Page 9: ...GLADIATOR DUAL DRIVE 9 ENCLOSURE LAYOUT Enclosure is shown without jacks See next page for jack layout and wiring 1590BBS...

Page 10: ...ND OUT IN VA GND IN CH A OUT CH A JACK SND RET V GND JACK OUT IN GND GND CH B OUT CH B IN VC IN VC OUT 1590BBS WIRING DIAGRAM This is the default wiring diagram with the send return loop If you want t...

Page 11: ...A OUT CH A JACK SND RET V GND JACK OUT IN GND GND CH B OUT CH B IN VC IN VC OUT 1590BBS WIRING DIAGRAM NO SEND RETURN LOOP If you want to omit the send return jacks use the following wiring diagram N...

Page 12: ...and opinions of others Projects may be used for commercial endeavors in any quantity unless specifically noted No attribution is necessary though a link back is always greatly appreciated The only us...

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