Vac Phi 300 Manuel d'utilisateur

F300The VAC Phi Three HundredStereo/Mono Beam Power AmplifierOperation & Maintenance Information Valve Amplification CompanyManual issued 03/15/20

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

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

10INSTALLING NEW OUTPUT TUBESOutput tubes are type KT88. Replacement output tubes should be purchased from VAC. It isimportant that the tubes be check

11CHECKING OUTPUT TUBE CONDITIONAs described at the beginning of this manual, the Phi is equipped with the KT88 Sentry circuit,which continuously moni

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

PLEASE READ CAREFULLYYour Phi Beam Power amplifier is fitted with a unique output tube monitoring circuit. Rather thandirectly contacting the audio pa

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

1CAUTIONTHE AMPLIFIER AND POWER SUPPLY CONTAIN NO USER SERVICEABLE PARTS. DO NOT REMOVE THEBOTTOM PLATES OR CHASSIS COVERS. LETHAL VOLTAGES ARE PRESEN

2INTRODUCTIONThe Phi 300 is a unique power amplifier, and the most power and detailed in VAC’s history.Featuring a new direct-coupled input & driv

3UNPACKING & ASSEMBLYYour amplifier has been shipped with the side and front glass in place. The following steps showhow these are installed, in t

4The front glass has the etched VAC logo. Install this between the frontpillars.Take great care not to scratch this glass.The front glass fits into a

5Set the beveled glass top into the aluminum top frame, oriented so that thetwo holes are on the left and right side.To prepare a Phi for shipment, fo

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

710) Do not place in a completely enclosed cabinet. Do not stack other equipment on top ofthe VAC unit.11) Do not operate on carpet or any other surfa