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Cornell Plexi 18/20 - User Manual

Cornell Plexi 18/20
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Cornell-Plexi 18/20
Head or Combo
Owners Manual
DC Developments
Mmusical Equipment Design & Development
Unit 13 Rosshill Industrial Park, Sutton Road,
Southennd-on-Sea. Essex SS2 5PZ : 01702 610964
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Summary

Cornell Amplifier Introduction and Sound

Cornell-Plexi Sound Characteristics

Discusses the amplifier's distinctive tone, simplicity, and point-to-point wiring.

Design and Construction Details

Technical Design and Wiring

Explains point-to-point wiring versus PCBs, component mounting, chassis, and cabinet build.

Pre-amplifier Channel Design

Details the two independent channels, volume, and tone control functionality.

Class A Output Stage Explained

Describes the Class A output stage, its benefits, and avoidance of bias adjustments.

Controls and Operation

Front Panel Controls Description

Explains Input, Volume, Tone, Channel 2, 18/20 Switch, Low-High Switch, Output, and Mains.

Mains Switch Operation and Delay

Details the mains switch operation, internal thermistor delay, and safety.

Mains Fuse Function and Replacement

Describes the mains fuse's protective role and replacement guidelines.

Specifications and Maintenance

Power, Impedance, and Dimensions

Lists power, fuse, input impedance, controls, output, cabinet dimensions, and weight.

Important Safety Warnings

Emphasizes avoiding moisture, not opening the unit, and grounding.

Tube Replacement Guide

Provides instructions for replacing pre-amp and power valves, noting they are hot.

Valve Failure and Fuses

Explains valve breakdown effects, fire risk, and the function of two fuses.

Cornell Plexi 18/20 Specifications

General IconGeneral
Wattage18/20 Watts
Channels2
AttenuationYes
Effects LoopNo
Weight18 kg
TypeTube Amplifier
Tubes2 x EL84
ControlsVolume
Speaker1 x 12"
Inputs2

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