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OPERATION MANUAL
MODEL : CSP325 - ANNIVERSARY STEREO PREAMP
REV 1 MAR 2021
OPERATION MANUAL
Anniversary Reference Vacuum Tube Preamplifier
Model CSP325
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Summarization of Contents

Important Safety Instructions
General Safety Precautions
Essential safety guidelines for operating the preamplifier, covering electrical shock and fire risks.
Product Overview and Setup
Thank You
A note of appreciation for purchasing the preamplifier and preserving audio craftsmanship.
Please Take a Moment
Reminder to record serial number and date for amplifier records.
Technical Assistance
Contact information and resources for help with the preamplifier.
Unpacking
Instructions for inspecting the preamplifier for shipping damage.
Getting Started
Initial steps for setting up the preamplifier, including acclimatization and necessary accessories.
Introduction
Background on the CSP325 model, its features, and design enhancements.
Component Identification and Connections
What's What
Top view diagram identifying the layout and controls of the CSP325.
Connections
Guidelines for maintaining clean cables, jacks, and tube pins for optimal fidelity.
Input Connections
Details on accommodating three line-level sources and the optional switch box.
Connecting Subwoofers
Information on using the dual RCA outputs for powered subwoofers.
Tube Management and Operation
Installing Tubes
Correct procedure for installing the specified 6N1P and 6N5P vacuum tubes.
Tube Matching
Discussion on the benefits of matching tubes for channel balance.
Tube Substitutions
Recommendations for rectifier and signal tube replacements.
Biasing Your Tubes
Explanation that the CSP325 features self-adjusting cathode biasing.
Tube Life
Information on expected vacuum tube lifespan and replacement indicators.
Rectifier Tubes
Details on rectifier tube function, compatibility, and potential issues.
VU Tubes
Explanation of VU tubes as input signal level indicators.
Operation and Setup
Step-by-step guide for connecting, setting up, and operating the preamplifier.
Input Selection
How to select between the three input pairs and the mute function.
Clipping
Understanding distortion and the preamp's resistance to clipping line-level outputs.
Input Levels
Interpreting VU tube indicators for input signal dynamics.
Burn-in
Recommended break-in period of approximately 200 hours for optimal sound.
Design
Overview of the preamp's dual triode design and SRPP configuration.
Voicing
Methods for tuning the sound through gain structuring and tube rolling.
Maintenance and Specifications
Maintenance
Guidance on cleaning and basic upkeep of the preamplifier.
Specifications
Technical details including weight, dimensions, circuit, and warranty information.
Service
Contact information and advice for troubleshooting and repairs.

Table of Contents