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F

300.1

The VAC Phi Three Hundred

Stereo/Mono Beam Power Amplifier

Operation & Maintenance Information

Valve Amplification Company

Manual issued 03/06/2007

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Summary of Contents for Phi 300

Page 1: ...F300 1 The VAC Phi Three Hundred Stereo Mono Beam Power Amplifier Operation Maintenance Information Valve Amplification Company Manual issued 03 06 2007 ...

Page 2: ...L TIMES THE TUBE COVERS WILL BECOME HOT IN NORMAL OPERATION DO NOT SET OR SPRAY ANYTHING ON THEM Never toucha tube if the glass is broken The internal structures carry highvoltage and could present a serious possibly lethal shock If a tube breaks unplug the amplifier and wait 30 minutes then remove the tube Keep flammable objects away from the amplifier DO NOT LEAVE THE AMPLIFIER UNATTENDED IN OPE...

Page 3: ...ra Linear Modes Illuminated Logo Installing New Output Tubes Biasing Checking Output Tube Condition Replacement of Low Level Tubes Care Of Chassis Tips and Advice A Word About Tubes in General Output Tubes Low Level Tubes Impedance Matching Grounding Tuning Your System Specifications Footnotes Warranty Registration Form ...

Page 4: ...ode front panel level controls may be selected or bypassed these can be useful in balancing room acoustics or trimming level balance in biamp applications The front panel mute control is useful when exchanging cables or making changes to your system Triode switches are provided for those who wish to explore that operating mode The chassis is machined from thick aluminum finished in a metallic base...

Page 5: ...lly install the front glass and top rails see detailed directions in the next section of this manual Take care not to chip or scratch the glass 04 Set the rear switch to mono or stereo as desired 05 Set the rear panel attenuator switch to DIRECT bypassing the front panel level controls or VARIABLE engages front panel level controls as desired 06 Connect the speaker cables the black lead goes to or...

Page 6: ... and whenever a tube is changed It is also a good idea to verify the settings periodically such as once a week Follow the bias procedure outlined later in this manual 18 Note that there is a front panel MUTE switch this function causes the input signal s to be muted The Phi 300 will only be muted if you select it This may be useful if you are changing cables or source equipment NOTE Do not remove ...

Page 7: ...ll place one of the spring pins into one of the small dimples machined into one of the side rails In the Illustration the pin has been located into the left side rail To complete the installation press the bar in the directionofthe pin already inserted and manoeuver the other end into the corresponding dimple in the other side rail In this illustration the bar is pressed to the left while the righ...

Page 8: ...ghresolutionaudio equipment Optimum sound should returnafter a few hours of operation preferably with an audio signal Please note that although your VAC System has been run for 48 hours at the factory the break in time of high resolution audio equipment is infuriatingly long The Phi sound will continue to season for approximately 200 hours The early sound of the amplifier will be less extended dyn...

Page 9: ...IS ON IT MAY TAKE SEVERAL MINUTES FOR THE TUBES TO COOL DOWN AFTER THE UNIT IS SWITCHED OFF Turn the switch to the position indicated then power the unit up and listen Less power is available in the full triode mode but distortion before clipping may be reduced as is output source impedance Experience reveals that the triode mode willsound somewhat leanon some systems and better defined on others ...

Page 10: ...outlined later in this manual Bias must be checked and adjusted when the amplifier first turns on at 60 seconds 90 seconds two minutes and five minutes In the earliest checks set the bias so that the meter read a bit to the left of center Final setting should be made after 15 30 minutes Recheck new tubes daily for the first week Whenever a tube is changed the bias settings must be checked and adju...

Page 11: ...k carpet will also cause this and is not safe Output Tube Bias Adjustment Bias settings it should be checked when you install your amplifier and approximately once every month thereafter It must also be adjusted each time a tube is replaced Allow the amplifier to reach normal operating temperature about ten minutes of warmup should be sufficient Mute the preamplifier or the Phi 300 1 and utilize t...

Page 12: ...over before operating the amplifier Replacement tubes are available from VAC and other sources For further information refer to Tips Advice A Word About Tubes in General and Tips Advice A Word About Low Level Tubes CARE OF CHASSIS VAC chassis are machined aluminum for superior electromagnetic performance The main chassis is finished in a durable clear powdercoat paint Cleaning the unit with a damp...

Page 13: ...r of a tube amplifier canselect those tubes which sound like the real thing in his her specific system Of course if the manufacturer you prefer is rare you may want to purchase a few spare tubes for the future How long should tubes last It has long been known in professional circles and probably now forgotten that a tube such as the 12AX7 will display better performance characteristics after two y...

Page 14: ...ter and driver tubes in the Phi is the 6SN7 medium mu octal twin triode Your amplifier is fitted with the current production VAC Tested 6SN7 from China which we find superior to the NOS types we have tried There are dozens of versions of this tube available in new old stock NOS from a variety of sources It would be impossible to characterize them all Other equivalent type numbers are 5692 13D2 B65...

Page 15: ...s vary over a wide range experimentation is essential Most speakers have a rated impedance of 4 or 8 ohms We recommend starting with the 8 ohm connection after you know the sound if that connection try the 4 ohm connection Choose the connection that sounds best to your ears If you bi wire your system run separate speaker leads from the amplifier to the high and low frequency transducers you may di...

Page 16: ...zz using the normal RCA input jack there are several steps you can take 1 Use the shortest interconnects possible 2 Use interconnects with good shielding properties 3 Keep the audio cables as close together as possible 4 Keep the AC cords away from the audio cables 5 Try different ground settings on your preamplifier if it has them For example the VAC Signature Phi and Renaissance preamplifiers ma...

Page 17: ...von Recklinghausen if it measures good and sounds bad it is bad If it measures bad and sounds good you ve measured the wrong things For those concerned with test bench performance the following describes typical measured performance of the Phi 300 when operated at 120 VAC 60 Hz Power Output 135 watts channel continuous average power at 1 kHz with less than 3 THD into 4 ohms connected to the 8 ohm ...

Page 18: ...______________________________________________ ________________________________________________________________________ Telephone _______ _______ _____________ e mail__________________________________ Dealername ________________________________ City ____________________________________ Salesperson ___________________ Purchasedate ____________ Serial Number ________________ HowdidyoufirstlearnofVAC...

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