Vac PA160 Mk I User Manual

1VAC PA160 "UNIVERSAL" MONOPHONIC POWER AMPLIFIEROperating InstructionsIndex:Introduction2Unpacking3Installation3Operation4Bias Adjustment4F

10Phillips/ECG/Sylvania 6550A:Similar to the GE tube, perhaps a bit better.Sovtek 6550:Samples tested do not bias correctly, having insufficient curre

11Installing New Output TubesReplacement tubes are available from VAC and other sources. It is not necessary that they be matched pairs,although a sli

12Care of ChassisVAC chassis are aluminum for superior electromagnetic performance. The finish is matt and textured powdercoat paints. This finish is

13SPECIFICATIONSThe VAC System has been developed with the critical ear as the major arbiter of quality, with bothconventional and unique measurements

2IntroductionThe PA160 is a wideband low-feedback monoblock power amplifier producing approximately 160 wattsper chassis in standard trim. It is large

3UnpackingDo not lift the PA160 by the transformer cans!Each tube socket on the amplifier is covered by a small round sticker. The color of this stick

4OperationContinuous operation is not recommended. If the amplifiers will not be auditioned for a few hours it is bestto turn them off. This avoids un

5Fine Tuning Your SystemThe VAC PA160 offers unparalleled opportunities for fine tuning your system for best subjectivereproduction. At first glance t

6FeedbackThe feedback controls are provided for adding controlled amounts of loop negative feedback to the amplifier.The exact amount depends on the t

7Output Impedance MatchingWe strongly suggest that you experiment with the three available impedance connections for the best sonicmatch with your sys

8Tubes in GeneralIt is a truth that each brand of tube sounds different in a particular high resolution circuit. This is becauseno two manufacturers m

9Output TubesYour VAC Amplifier can use the following output tube types: KT88, 6550/6550A, KT77, EL34/6CA7,KT66, 6L6GC. DO NOT MIX TUBE TYPES. Set the