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VAC PA100/100 POWER AMPLIFIER

Operating Instructions

DO NOT OPEN THIS UNIT - NO USER SERVICEABLE PARTS INSIDE. DO NOT

REMOVE THE BOTTOM PLATE. LETHAL VOLTAGES ARE PRESENT WITHIN

THE CHASSIS. DO NOT EXPOSE TO MOISTURE OR OPERATE IT IF WET.

VACUUM TUBES BECOME HOT ENOUGH TO CAUSE SERIOUS BURNS. NEVER

TOUCH A TUBE WHEN THE UNIT IS ON. IT MAY TAKE SEVERAL MINUTES

FOR THE TUBES TO COOL DOWN AFTER THE UNIT IS SWITCHED OFF.

DO NOT PLUG INTO AC UNTIL ALL CONNECTIONS ARE COMPLETED.

Introduction

The VAC PA100/100 is a single chassis wide-band low-feedback stereo

amplifier conservatively rated at 100 watts per channel. It is to be operated only

from the voltage visible on the configuration card located under the fuse. Please

contact VAC or your dealer if the voltage in your area does not agree with the

label. The fuse is a slow blow type of the size noted on the back of the chassis.

A tube cage is available as an option.

The input circuit of the PA100/100 is derivative of the Williamson design, which

was first published in England in 1947, and was the mainstay of the original

high fidelity movement. Notable features of this circuit include a direct-coupled

input amplifier and phase splitter, resulting in low phase shift, and inherent

precise balance of the phase splitter (if properly executed) at all frequencies and

levels, resulting in excellent push-pull balance, stability, and low distortion.

The output stage is derived from the renowned PA90C, featuring individually

adjustable "fixed-bias" and partial-triode ("ultra-linear") operation.

Premium parts are employed throughout, including 14 pound 22 section bifilar-

wound ultra-wideband output transformers, polypropylene and polystyrene

signal capacitors, high current rectifiers, low ESR power supply, and

proprietary wiring. The quality of parts and careful layout allows the use of very

little feedback for high sonic purity and low distortion.

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Inhaltsverzeichnis

Seite 1 - VAC PA100/100 POWER AMPLIFIER

VAC PA100/100 POWER AMPLIFIEROperating InstructionsDO NOT OPEN THIS UNIT - NO USER SERVICEABLE PARTS INSIDE. DO NOTREMOVE THE BOTTOM PLATE. LETHAL VOL

Seite 2 - Physical requirements:

TIPS & ADVICEA Word About Impedance MatchingWe strongly suggest that you experiment with the three available impedance connections for the best so

Seite 3 - Operation

SPECIFICATIONSThe VAC System has been developed with the critical ear as the major arbiter of quality, with both conventionaland unique measurements p

Seite 4 - Installing New Output Tubes

UnpackingEach tube socket on the amplifier is covered by a small round sticker. The color of this sticker corresponds tothe color of the sticker on a

Seite 5

OperationContinuous operation is not recommended. If the amplifiers will not be auditioned for a few hours it is best toturn them off. This avoids und

Seite 6 - REGISTRATION FORM

Installing New Output TubesReplacement tubes are available from VAC and other sources. Output tubes are KT88 beam power KinklessTetrodes (6550 may als

Seite 7 - Tips & Advice

Care of Chassis & Face PlateVAC chassis are aluminum for superior electromagnetic performance. The finish is a tough textured powdercoat paint. Th

Seite 8

WarrantyThis amplifier is warranted for a period of thirty (30) days from the date of purchase. In addition, if theregistration card(s) is received by

Seite 9

Tips & AdviceA Word About Tubes in GeneralIt is a truth that each brand of tube sounds different in a particular high resolution circuit. This is

Seite 10 - TIPS & ADVICE

TIPS & ADVICEA Word About Output TubesYour VAC Amplifier can use 2 different output tube types: the KT88 Beam Power Kinkless Tetrode and the6550A

Seite 11

TIPS & ADVICEA Word About Low Level TubesThe small tubes (Voltage Amplifier/Phase Splitter and Driver) in the VAC Amplifiers are type 12AU7. This

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Mazda VAC PA100/100 Betriebsanleitung

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Inhaltsverzeichnis

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