VAC Phi 110/110 Operation & Maintenance Information Download Page 9

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INPUT CONNECTORS

XLR connection, balanced or single-ended, are made to the XLR jack on the
rear panel.

The INPUT SELECT toggle switch is set to the BALANCED position.

The XLR connection follows the EIA “pin 2 hot” polarity convention.

RCA (single ended) connection normally is made to the RCA jack on the rear
panel. This is the “direct in” mode.

The INPUT SELECT switch is set to “RCA”

In many systems a lower noise floor and better sound is achieved with RCA
single-ended sources by using the XLR input via the lower RCA jack and the
switch set to BALANCED position. 

Note:  the  photo  shows  an  earlier  version  that  required  an  RCA  to  XLR
adapter. Later units have both an XLR connector and a lower RCA jack.

The balanced input also has a switch that allows pin 1 to float or be connected to the chassis. Set
this switch for best sound/lowest noise in your system.

 

NOTE: Do not remove and connect input cables or speaker cables while is amplifier is running.

Doing so risks damage to your loudspeakers or the amplifier.

Do not operate the amplifier without a loudspeaker or load resistor attached.

Summary of Contents for Phi 110/110

Page 1: ...10 110 The VAC Phi Two Twenty Monophonic Beam Power Amplifier Phi 110 110 Stereo Beam Power Amplifier Operation Maintenance Information Valve Amplification Company Manual issued 01 24 2004 Revised 07...

Page 2: ...is selected the meter indicates the incoming ac voltage wall voltage Note These LED s will also be green when the amplifier is first switched on and will extinguish when the bias resistors have reach...

Page 3: ...O NOT SET OR SPRAY ANYTHING ON THEM THE AMPLIFIER AND POWER SUPPLY ARE HEAVY IT IS ADVISABLE TO HAVE ASSISTANCE IN UNPACKING MOVING AND SETTING UP BE SURE TO USE PROPER LIFTING TECHNIQUES TO AVOID BAC...

Page 4: ...and phase splitting Type 6SN7 5692 octal twin triodes do the honors Two superb VAC output transformer interconnected in a way that allows high power to be delivered with the sonic purity of low power...

Page 5: ...the chance of fingerprinting the nickel plated chassis Wipe any oils off immediately Take care to prevent the tool from scratching the chassis Remove the top frame From each of the four columns remove...

Page 6: ...lass yet Install the six aluminum blocks at the top of the rear glass and side glasses If there is a dimple in the block it should face the outside of the amplifier Tighten the metal setscrews that se...

Page 7: ...t contact tubes that indicates proper alignment For the 300B tubes two of the pins are of larger diameter so that the tube will only fit into the socket one way Set the beveled glass top into the alum...

Page 8: ...tack other equipment on top of the VAC unit 07 Do not operate on carpet or any other surface that might block air flow 08 The chassis and glass will become hot in normal use 09 Do not allow the chassi...

Page 9: ...d with RCA single ended sources by using the XLR input via the lower RCA jack and the switch set to BALANCED position Note the photo shows an earlier version that required an RCA to XLR adapter Later...

Page 10: ...stem 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 sou...

Page 11: ...riode ultra linear operation of pentodes and beam power tubes dates back to 1937 Both modes of operation are available with your VAC Phi amplifier via a single switch on the top plate Although the mod...

Page 12: ...n one orientation determined by the plastic keyway in the center of the base Do not use excessive force Replace the top glass cover before operating the amplifier Whenever a tube is changed the bias s...

Page 13: ...s possible that a tube within the normal current range will still display the green indicator light If a tube draws excessive current the indicator light will turn red and the high voltage supply will...

Page 14: ...eneral 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 nickel plating which is k...

Page 15: ...er of a tube amplifier can select 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...

Page 16: ...er 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 t...

Page 17: ...to 8 ohms 4 ohms 2 to 4 ohms 2 ohms 1 to 2 ohms Phi 220 only Since the impedance of most loudspeakers vary over a wide range experimentation is essential Most speakers have a rated impedance of 4 or 8...

Page 18: ...nects with good shielding properties 3 Keep the two amplifiers and their cables as close together as possible 4 Use the same AC outlet for both channels 5 Keep the AC cords away from the audio cables...

Page 19: ...he immortal words of Daniel 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 perf...

Page 20: ...lephone _______ _______ _____________ e mail __________________________________ Dealer name ________________________________ City ____________________________________ Salesperson ___________________ P...

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