Nagra VPA User Manual

P/N: 2055008151
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VPA
Ultimate 845 amplifiers
Instruction manual

Nagra VPA Specifications

General

Input Impedance	100 kOhms
Frequency Response	20Hz to 20kHz
Output Impedance	8 Ohms
Signal-to-Noise Ratio	>90dB
Tubes	4 x EL84, 2 x ECC83

Summary

Security Warnings

Warranty Information

Package Contents

Setting Up the Amplifier

Installation of the Feet

Instructions for attaching the feet to ensure the VPA amplifier is stable.

Tube Installation and Protection

Installing the Tubes

Step-by-step guide to inserting the 845 tubes into the VPA amplifier.

Tube Protection Installation

Procedure for installing protective cages for the hot amplifier tubes.

VPA Connections

Connecting the VPA to the Source

Guide on connecting the VPA to an audio source via XLR or RCA.

Connecting Loudspeakers

Instructions for connecting the VPA to loudspeakers using correct terminals.

Connecting AC Mains Power

Guidance on verifying and connecting the VPA amplifier to AC power.

Operation

Using the Main Selector

Explanation of the main selector switch for powering and muting the VPA.

Selecting Speaker Impedance

How to use the Load Match Meter to select the correct speaker impedance.

Tube Management

Tube Ageing and Replacement

Information on the lifespan of tubes and when they should be replaced.

Tube Compatibility

Details on the rigorous selection and pairing process for VPA tubes.

Tube Bias Adjustment

Instructions on how to adjust the tube bias for optimal performance.

Technical Specifications

Declaration of Conformity