Vac Phi 300.1a Manuel d'utilisateur

F300.1The VAC Phi Three Hundred, “A” versionStereo/Mono Beam Power AmplifierOperation & Maintenance Information Valve Amplification CompanyManua

9TRIODE & ULTRA-LINEAR MODESTriode amplification is the oldest form of amplification known, while partial triode ("ultra-linear")operati

10INSTALLING NEW OUTPUT TUBESFirst, see the SAFETY NOTICE earlier in the manual.Output tubes are type KT88. Replacement output tubes should be purchas

11CHECKING OUTPUT TUBE CONDITION / OUTPUT TUBE BIAS ADJUSTMENTBias settings it should be checked when you install your amplifier and approximately onc

12REPLACEMENT OF LOW LEVEL TUBESAll power must be switched off. Allow tubes to cool down. Remove the top glass cover. Removeand replace with new tubes

13TIPS & ADVICE SECTIONA Word About Tubes in GeneralIt is true that each brand of tube sounds different in a particular high resolution circuit. T

14Tips: Output TubesYour VAC Amplifier uses the KT88 kinkless tetrode. It is strongly recommended that replacementtubes be purchased only from VAC. If

15Tips: Impedance MatchingWe strongly suggest that you experiment with the available impedance connections for the bestsonic match with your system. S

16Tips: Audio GroundingSystems incorporating single-ended interconnect cables (“RCA cables”) are prone to a problemknown as “ground looping”, which ca

17SPECIFICATIONSThe VAC Phi has been developed with the critical ear as the major arbiter of quality, with bothconventional and unique measurements pr

WARRANTYYour equipment is warranted for a period of thirty (30) days from the date of purchase. In addition, if theregistration form is received by VA

1CAUTION - SAFETY NOTICETHE AMPLIFIER CONTAINS NO USER SERVICEABLE PARTS. DO NOT REMOVE THE BOTTOM PLATESOR CHASSIS COVERS. LETHAL VOLTAGES ARE PRESEN

2INDEXIntroductionInstallationInstalling the front glass and top barsInput connectorsOperationFeedbackTriode & Ultra-Linear ModesIlluminated LogoI

3INTRODUCTIONThe Phi 300 is a unique power amplifier, and the most powerful and detailed in VAC’s history.Featuring a new direct-coupled input & d

4Tube Placement - VAC Phi 300V9 V10 V11 V12 KT88V1 V2 V3 V4 6SN7V5 V6 V7 V8 K

510)Do not place in a completely enclosed cabinet. Do not stack other equipment on top of theVAC unit.11)Do not operate on carpet or any other surface

6INSTALLING THE FRONT GLASS AND TOP RAILSYour amplifier has been shipped with the front glass and the top rails removed.The following steps show how t

7The top tube cage bars have a spring pin in each end.To install, place one of the spring pins into one of the small dimplesmachined into one of the s

8OPERATIONBy time delay, sound will begin approximately 60 seconds after turn on.As with all high fidelity products, the sound characteristic of the V