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Duncan Convertible Head - User Manual

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Summary

Unpacking and Packing Materials

Inspecting for Shipping Damage

Inspect your Convertible amp for hidden damage that may have occurred in transit.

Retaining Packing Materials

Save all packing materials for potential return shipment to the factory.

Front Panel Controls Overview

Load Resistor Input Usage

Use load resistor plugs to match amp input impedance to pickup output voltages.

Pickup Impedance Matching

Guidance for matching pickup impedance to the amp's 4.7 meg-ohm input jacks.

Front Panel Controls (Continued)

Auxiliary Guitar Input Function

Parallel input for a second guitar or instrument; affects volume and signal.

Overdrive and Master Volume Controls

Controls preamp distortion/volume and sends signal to power amplifier.

Channel Indicators and Tone Controls

LEDs indicate active channels; tone controls adjust treble, mid, and bass.

Front Panel Controls (Continued)

Tone Control Adjustments

Adjusts high-end, mid-range, and low-end response using passive filters.

Reverb and Channel Selector Operation

Controls reverberation amount and allows manual channel switching.

Front Panel Controls (Continued)

Channel Selector Jack and Footswitch

Connects a footswitch for channel switching and control.

Variable Power Control and Jack

Adjusts power output wattage and allows remote control via a pedal.

Rear Panel Controls Overview

Fuse Holder and Power Switch

Houses the fuse for protection and controls power and AC polarity.

Standby Switch Functionality

Temporarily turns off sound output while keeping tubes warm for quick restarts.

Rear Panel Controls (Continued)

AC Convenience Outlets

Provides AC power for external equipment, up to a total of 700 watts.

Effects Loop and Reverb Connections

Connects external effects units and reverb units for enhanced sound shaping.

Rear Panel Controls (Continued)

Pentode;Triode Mode Switch

Changes EL-34 output tube operation between 100W Pentode and 60W Triode modes.

Variable Damping and Speaker Jacks

Controls speaker damping and provides impedance-matched speaker outputs.

Slave Out Jack Usage

Patches the amp's output signal directly to other audio units like mixers.

Module Arrangements Overview

Shipped Module Configurations

Shows the default preamp module arrangement for Channel 1 and Channel 2.

Example Module Sound Setups

Illustrates various module combinations for achieving different sonic results.

Preamp Module Details

Module Characteristics Chart

Details module characteristics like Model, Type, Circuit, Frequency Response, and Gain.

Normal and Low Cut Normal Modules

Describes quiet, clean tube sound and low-frequency cutting for leaner tone.

Preamp Module Details (Continued)

FET, IC, and Cascode Modules

Details solid-state modules and a tube module for varied tonal characteristics.

Preamp Module Details (Continued)

Classic Distortion and Presence Modules

Describes compressed distortion, low gain, and up-front sound enhancement.

Classic and Low Cut Classic Modules

Details brighter, 'dirtier' tones and low-frequency cutting for cleaner sounds.

Preamp Module Details (Continued)

Hi-Gain and Jeckel & Hyde Modules

Describes high sustain, gain, chunky rhythm, and long sustain characteristics.

Punch and Deluxe Sound Modules

Provides upfront punch, brightness, and deluxe type sound options.

Preamp Module Details (Continued)

Hi-Gain Hybrid and Hi-Gain +6 Modules

Details hybrid drive, more hi-end, hot/crunchy tone, and higher gain options.

Classic E.Q. and Hi-Gain E.Q. Modules

Offers crisp rhythm with presence and crunchy lead sounds with EQ capabilities.

Preamp Module Details (Continued)

Harmonic and Rock & Roll Modules

Provides odd order harmonics for metal and sounds for loud rock and roll.

EQ Modules for Rhythm and Lead

Offers extended tone range and 4-band EQ for customizing rhythm and lead sounds.

Changing Preamp Modules

Module Removal Procedure

Step-by-step instructions for safely removing preamp modules from the amplifier.

Module Installation Procedure

Step-by-step instructions for installing new preamp modules into the amplifier.

Tubes and Microphonics

Eliminating Microphonic Effects

Offers methods to eliminate microphonic ringing in preamp tubes.

Tube Types and Input Module Impact

Compares tube types and suggests using FET/IC input modules to prevent microphonics.

Spare Tube and Power Amp Tubes

Power Amp Tube Selection and Alternatives

Discusses EL-34 power tubes and robust alternatives like 6CA7, 6L6, and 6550.

Load Resistor Plug Values and Effects

Supplied Load Resistor Plugs

Lists the two load resistor plugs provided with the amp and their effects.

Building Custom Load Resistor Plugs

Provides information on building custom load resistor plugs using components.

Troubleshooting Guide

Amplifier Power and Sound Output Issues

Diagnoses and resolves issues with the amplifier not powering on or producing sound.

Resolving Amplifier Hum

Addresses causes of excessive hum, including power and grounding issues.

Troubleshooting (Continued)

Fuse Blowing Issues

Diagnoses and resolves issues causing fuses to blow after operation or immediately.

Distorted Sound Diagnosis

Addresses distorted sound occurring on one or both channels of the amplifier.

Troubleshooting (Continued)

Reverb and Channel Switching Problems

Provides solutions for issues with reverb functionality and channel switching.

Feedback and Ringing Solutions

Offers remedies for feedback or unwanted ringing sounds from the amplifier.

Duncan Convertible Head Specifications

General IconGeneral
Wattage50W
Impedance4, 8, 16 ohms
Footswitchable ChannelsYes
TypeTube
Tubes4 x 12AX7
ControlsBass, Middle, Treble, Presence
Effects LoopYes

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