VTA 845 Owners manual

1

845 Monoblock

Contents

Introduction ……………………………………………………………………... 2

Amplifier, Front View ………………………………………………………….. 3

Amplifier, Top View ……………………………………………………………. 4

Amplifier, Rear View …………………………………………………………… 5

Power Supply …………………………………………………………………… 6

Installation ………………………………………………………………………. 6

Bias Adjustment ……………………………………………………………….. 10

Tube Replacement …………………………………………………………….. 12

Fuse Replacement ……………………………………………………………... 12

Maintenance …………………………………………………………………….. 13

Troubleshooting ………………………………………………………………... 14

Specifications …………………………………………………………………... 15

Maintenance Log ………………………………………………………………. 16

Warranty …………………………………………………………………………. 17

2

Introduction

Thank you for purchasing the VacuumTubeAmps 845 Monoblock Power Amplifier,

designed, engineered and hand crafted in the U.S.

Features:

User adjustable bias controls, and two high quality analog meters for each 845 power tube.

Gold plated RCA input jack.

Gold plated five-way speaker binding posts.

Gold plated Yamamoto tube sockets, the best tube sockets in the world.

Soft start power supply greatly extends the life of components and tubes.

Six foot amplifier-to-power supply cable with MIL-grade connectors.

High end potted output transformer provides a choice of 4Ω or 8Ω speakers.

Two ball bearing fans cool the amplifier for long life.

Variable density isolation feet.

Beautiful solid oak side panels for a power amplifier that looks as great as it sounds.

Thank you again, and enjoy your new 845 Monoblock Power Amplifier.

Michael A. Burrows, Owner, VacuumTubeAmps.com.

Email: [e-mail]

Fax: [phone]

All rights reserved. No part of this publication may be reproduced, or transmitted, in any form or by any means,
Electronic, mechanical, recording, or otherwise, without the prior permission of www.vacuumtubeamps.com

3

Amplifier, Front View

1, 2 BIAS METERS

3 AIR FILTER

4

Amplifier, Top View

1 Speaker Impedance Switch

2 Power Switch

3, 9 845 Power Tube

4, 10 Bias Controls

5, 6 6SN7GT

7 6CG7

8 12AU7

11 Bias Switch

5

Amplifier, Rear View

1 Binding Post, Ground

2 Input Jack

3, 4 Binding Posts, Speaker

5 Serial Number/Warning Plate

6 Power Connector

6

Power Supply

1 AC Power Cord

2 Fuse

3 Serial Number/Warning Plate

4 Power Connector

Installation

1. Carefully unpack the shipping boxes and save for future use. Don’t touch the bias controls
on the amplifier.

2. Set the 845 Monoblock amplifier and Power supply in a place that is out of reach of
children and pets, and away from sources of moisture and water.