DYNACO PAS-4 User Manual

PAS-4
Vacuum Tube Preamplifier
Owner's Manual
PAS-4 Vacuum Tube Preamplifier
R
PAS-4
INPUT TAPE DUBBING
TAPE MONITOR
BALANCE
VOLUME
POWER
MONO
EPL
IN IN
CD
VIDEO
TUNER
AUX
PHONO
SOURCE
2 to 1
1 to 2
SOURCE
TAPE 1
TAPE 2
LEFT RIGHT
VACUUM TUBE PREAMPLIFIER

DYNACO PAS-4 Specifications

General

Type	Stereo Preamplifier
Frequency response	20Hz to 20kHz ±0.5dB
Weight	12 lbs
Inputs	Tuner, Phono
Outputs	Main, Tape
Total harmonic distortion	0.1%
Signal-to-noise ratio	90dB
Tube Complement	4 x 12AX7

Summary

Introduction to Dynaco PAS-4

Rear Panel Inputs and Outputs

Fuse Information

Details the AC line fuse rating and replacement procedure.

Operating the PAS-4 Preamplifier

Turn-On Delay and Visual Indicator

Explains the 45-second warm-up period and indicator lamp behavior.

Input Signal Selection

Describes how to select the audio signal source for listening.

Tape Deck Listening Modes

How to use the TAPE MONITOR switch for listening to tape playback.

External Processing Loop (EQ Switch)

Explains the function of the EQ switch and External Processing Loop.

Mono Switch Functionality

Describes the mono switch function for monaural playback.

Balance Control Adjustment

Details how to adjust the balance between left and right channels.

Tape Dubbing Operations

Explains signal routing for recording between tape decks.

Tube Replacement Guide

Alternate Tube Type Recommendations

Minimizing System Noise

Dynaco PAS-4 Warranty Information

PAS-4 Technical Specifications

Phono Section Specifications

Details specifications for the phono preamplifier section.

Line Section Specifications

Details specifications for the line preamplifier section.

Electrical and Mechanical Specs

Details power requirements, dimensions, and weight.

Circuit Schematics

PAS-4 PC Board Parts List