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Johnson Loredo T25-R - User Manual

Johnson Loredo T25-R
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Table of Contents

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Summary

Product Safety Information

Power Sources

Information on operating the product from the correct power source.

Insertion Warning & Liquid Spilling

Warnings against inserting objects or spilling liquids into the product.

Servicing

Panel Functions and Operating Instructions

The Front Panel

Detailed explanation of the controls and indicators located on the front of the amplifier.

Gain Control

Equalizer;Tone Controls

Bass, Middle, and Treble controls for shaping the guitar's tone.

Reverb Control

Master Volume

Standby Toggle Switch

The Rear Panel

Details on the connections and controls found on the rear of the amplifier.

Fuse Holder

Protective device for the amplifier; check and replace if necessary.

Power IEC Socket

Connects the amplifier to the power source using the included cord.

Technical Specifications

Tone Controls Specifications

Jack Specifications

Tube Specifications

Limited Warranty Information

Warranty Coverage and Period

Details on the warranty period for the amplifier and its tubes.

Warranty Exclusions

Conditions and actions that will void the product warranty.

Manufacturer Liability

Summary

Product Safety Information

Power Sources

Information on operating the product from the correct power source.

Insertion Warning & Liquid Spilling

Warnings against inserting objects or spilling liquids into the product.

Servicing

Panel Functions and Operating Instructions

The Front Panel

Detailed explanation of the controls and indicators located on the front of the amplifier.

Gain Control

Equalizer;Tone Controls

Bass, Middle, and Treble controls for shaping the guitar's tone.

Reverb Control

Master Volume

Standby Toggle Switch

The Rear Panel

Details on the connections and controls found on the rear of the amplifier.

Fuse Holder

Protective device for the amplifier; check and replace if necessary.

Power IEC Socket

Connects the amplifier to the power source using the included cord.

Technical Specifications

Tone Controls Specifications

Jack Specifications

Tube Specifications

Limited Warranty Information

Warranty Coverage and Period

Details on the warranty period for the amplifier and its tubes.

Warranty Exclusions

Conditions and actions that will void the product warranty.

Manufacturer Liability

Overview

  1. Function Description
  2. Important Technical Specifications
  3. Usage Features
  4. Maintenance Features

This document is the user's manual for the Loredo T25-R tube amplifier, a product of Johnson Musical Instruments Corporation, established in 1993. The manual provides essential safety information, operational instructions, technical specifications, and warranty details for the amplifier.

Function Description

The Loredo T25-R is a 25-watt RMS tube guitar amplifier designed to deliver warm, powerful, and high-fidelity sound. It features a comprehensive set of controls for tone shaping, volume, gain, and effects, making it suitable for various musical applications and styles. The amplifier's tube-driven design contributes to its characteristic warm tone and dynamic response, which is highly sought after by guitar players.

Important Technical Specifications

Name/Model: Loredo/T25-R

Output Power:

  • 25 Watts RMS into 8Ω

Power Requirements & Consumption:

  • 120VAC, 60Hz
  • 100/115VAC, 50/60Hz
  • 220VAC/230VAC/240VAC, 50/60Hz
  • Input Power: 75W

Frequency Response:

  • 60Hz to 18kHz

Sensitivity (Full Gain):

  • 5mV

Signal To Noise Ratio (S/N):

  • 90dB

Total Harmonic Distortion (%) THD:

  • 0.05% THD @ 5 Watts RMS into 8Ω Load @ 1kHz
  • 0.10% THD @ 25 Watts RMS into 8Ω Load @ 1kHz

Tone Controls:

  • Bass (at 150Hz): +6.5/-5.3dB
  • Mid (at 1kHz): +2.1/-3.3dB
  • Treble (at 10kHz): +5.0/-9.0dB

Reverb:

  • Accutronics/Johnson Reverb

Jacks:

  • Input: 1/4" Mono Jack with 1MΩ impedance
  • Footswitch: 1/4" Mono Jack
  • External Speaker Out: 1/4" Mono Jack
  • Effects (In/Out): 1/4" Mono Jacks
  • Line-Out: XLR

Speaker:

  • 10" 8Ω AlphaTone

Tubes:

  • Preamp Section: 2 x 12AX7 Tubes
  • Power-Amp Section: 2 x EL84 Tubes

Dimensions (W x H x D):

  • 14.5" x 17.25" x 9.5" (36.8cm x 43.8cm x 24.1cm)

Net Weight:

  • 25 lbs (11.3 kg)

Usage Features

The Loredo T25-R amplifier offers a range of features designed for versatile use and sound customization:

Front Panel Controls:

  • Input (1): 1/4" mono jack for connecting an electric guitar.
  • Gain (2): Adjusts the preamp level, allowing for more overdrive at higher settings.
  • Equalizer Controls (Bass (3), Middle (4), Treble (5)): Three-band EQ for shaping the low, mid, and high frequencies. Knobs can be turned clockwise to boost and counter-clockwise to cut, with a center position for no cut or boost.
  • Reverb (6): Controls the amount of Accutronics/Johnson reverb effect applied to the guitar's signal.
  • Master/Volume (7): Adjusts the overall output volume of the amplifier.
  • Foot Switch (8): 1/4" jack for connecting an optional single-button footswitch to engage/disengage the reverb.
  • LED (9): Indicates power status (lit when power is on).
  • Standby Toggle Switch (10): Keeps the tubes powered up to avoid warm-up delays between sessions and extends tube lifetime.
  • Power Toggle Switch (11): Turns the amplifier on or off.

Rear Panel Controls and Connections:

  • Fuse Holder (12): Contains the amplifier's protection fuse.
  • Power IEC Socket (13): For connecting the power cord.
  • Wet/Dry Blend Control (14): Mix control for the FX loop, allowing users to blend the dry signal with the signal from external effects units. Turning to "Dry" provides no effects, while turning to "Wet" sends only the FX device's signal to the power amplifier.
  • Effects (IN/RECEIVE) (15): 1/4" mono jack for receiving signal from an external effects or signal processing device.
  • Effects (OUT/SEND) (16): 1/4" mono jack for sending signal from the amp to an external effects or signal processing device.
  • External Speaker (17): 1/4" mono jack for connecting an additional external 8-Ohm speaker. Warning: Do not plug in headphones here to avoid hearing damage.

Maintenance Features

The manual emphasizes several aspects related to the maintenance and care of the Loredo T25-R amplifier:

Safety Information:

  • Risk of Electric Shock: Users are warned not to open the cabinet or remove covers due to dangerous high voltages inside. All servicing should be referred to qualified personnel.
  • Moisture and Liquids: The product should not be exposed to rain or moisture, and no objects filled with liquid should be placed on it.
  • Heat: The amplifier should be placed away from heat sources like radiators, stoves, or other heat-producing products.
  • Cleaning: Unplug the amplifier from the wall outlet before cleaning. Use a damp cloth; avoid liquid or aerosol cleaners.
  • Fuse Replacement: In case of a power malfunction, the fuse will disconnect the power source. Users are instructed to unplug the amplifier, open the fuse holder, check and replace the fuse with one of the same rating (voltage and current). If problems persist, consult a qualified service technician.

Warranty Information:

  • Limited Warranty: The amplifier is warranted to the original purchaser for five (5) years against defects in material and workmanship, excluding tubes.
  • Tube Warranty: Tubes are warranted for ninety (90) days from the original date of purchase.
  • Repair/Replacement: The manufacturer will repair or replace defective products at its option, provided the product is returned to the original place of purchase.
  • Warranty Exclusions: The warranty does not cover misuse, damage from neglect, abuse, alteration, improper handling, unauthorized repair, modification, accidents, or external causes like excessive heat or humidity.
  • Liability: The manufacturer's maximum liability is limited to the wholesale value of the product, excluding indirect, incidental, collateral, exemplary, or consequential damages.

The manual encourages users to experiment with different guitars, pickups, and effects devices to discover unique sounds and develop their individual tone.

Johnson Loredo T25-R Specifications

General IconGeneral
BrandJohnson
ModelLoredo T25-R
CategoryAmplifier
LanguageEnglish

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