Vac Vintage High Power Manuel d'utilisateur

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VAC VINTAGE HIGH POWER Mk II
MONOPHONIC POWER AMPLIFIER
Operating Instructions
DO NOT OPEN THIS UNIT - THERE ARE NO USER SERVICEABLE
PARTS INSIDE. DO NOT REMOVE THE BOTTOM PLATES. LETHAL
VOLTAGES ARE PRESENT WITHIN THE CHASSIS. DO NOT EXPOSE
THIS UNIT 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 AN AC SOURCE UNTIL ALL CONNECTIONS ARE
COMPLETED.
Introduction
The Vintage High Power is a wideband low-feedback monoblock power amplifier producing
approximately 100 watts per chassis. It is largely based on the legendary Williamson circuit,
which was first published in England in 1947, and was the mainstay of the original high
fidelity movement. Notable features of this circuit include:
- direct-coupled triode input amplifier and phase splitter, resulting in low phase shift
- inherent precise balance of the phase splitter (if properly executed) at all frequencies
and level, resulting in excellent push-pull balance and low distortion
In the refined form presented in the VAC, this circuit delivers true state-of-the-art
performance, and repudiates the more complex designs seen even to this day. The output
stage features independent cathode bias for each tube, which results in excellent sound and
the most stable and maintenance free operation available anywhere.
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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Résumé du contenu

Page 1 - MONOPHONIC POWER AMPLIFIER

VAC VINTAGE HIGH POWER Mk IIMONOPHONIC POWER AMPLIFIEROperating InstructionsDO NOT OPEN THIS UNIT - THERE ARE NO USER SERVICEABLEPARTS INSIDE. DO NOT

Page 2 - Installation

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

Page 3 - Bias Adjustment

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

Page 4 - Tube Types

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

Page 5 - Need Help?

OperationContinuous operation is not recommended. If the amplifiers will not be auditioned for a few hours it is best to turn themoff. This avoids und

Page 6 - REGISTRATION FORM

Tube TypesThe input/splitter tube V1 and the driver tube V2 may be type 12AU7A/ECC82/E82CC or type 12BH7. The outputtubes V3, V4, V5, and V6 may be ty

Page 7 - Tips & Advice

Care of Chassis & Face PlateVAC chassis are aluminum for superior electromagnetic performance. The standard face plate finish is a durabletextured

Page 8

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

Page 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

Page 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 the 6550A

Page 11 - SPECIFICATIONS

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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