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Randall RT50H User Manual

Randall RT50H
10 pages
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AMPLIFIERS
RT2/50
MIDI SWITCHING TUBE
POWER AMPLIFIER.
OWNERS MANUAL

Other manuals for Randall RT50H

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Randall RT50H Specifications

General IconGeneral
Power Output50 Watts
TubesYes
Effects LoopYes
Preamp Tubes3 x 12AX7
Power Tubes2 x EL34
Footswitchable ChannelsYes
TypeTube
Channels2
EQ3-Band (Bass, Mid, Treble)
Speaker Output1 x 16 Ohm, 2 x 8 Ohm
Dimensions10.5 x 9.5 inches

Summary

General Information and Safety

Operational Warnings

Essential precautions for operating the amplifier safely and preventing damage.

Important Safeguards

Critical safety instructions applicable to all Randall electronic products.

Electrical Hazard Symbols

Explains symbols for lightning flash and risk of electric shock.

Environmental Protection Warnings

Precautionary warning against exposing the unit to rain or moisture.

Front Panel Features and Controls

Channel Switching

Control for selecting between three channels or bypass mode, programmable via MIDI.

Volume Controls

Controls the output level for each of the two channels.

Density Controls

Adds low-end EQ to enhance guitar tone.

Presence Controls

Adds hi-end EQ for sparkle and clarity to guitar tone.

Tube Bias Section

Allows for biasing power tubes for optimal performance and tube longevity.

Play/Standby Switch

Protects power tubes by putting the amp in standby mode.

Power Switch

The main AC power switch to turn the unit on or off.

Rear Panel Features

AC Power/Voltage Selector

Allows operation at different AC voltage settings (100-230V).

MIDI IN/THRU Jacks

Connects to MIDI preamps for signal routing and control.

Impedance Select

Sets the correct impedance for connected speaker cabinets.

Main Inputs

Connects the preamp signal to Channel 1 for mono or stereo operation.

Switching/Stereo Switch

Selects between 100W stereo or 50W per channel mono switching modes.

Main Outputs

Connects to internal or external speakers, must be used for extension outputs.

Extension Outputs

Connects to additional external speaker cabinets.

MTS Power Tube Bias System

Bias Readings and Adjustments

Instructions on using a voltmeter to adjust the tube bias.

Tube Bias Chart

Recommended bias readings for various tube types.

Fuse Protection

Details on fast-blow fuses for tube protection and LED indicators.

Advanced Theory of Bias

Explains Ohm's Law in relation to bias measurements.

MIDI Operation and Control

MIDI Channel Selecting

How to use MIDI to select channels on the RT2/50 with a preamp.

Program Channel Switching

Step-by-step guide to programming channels via MIDI.

Footswitch Programming

Instructions for programming the optional RF4 MIDI footswitch.

Customer Service

Contact Information

Phone number and email address for Randall customer support.

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