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Phono: 

Selects between the MM and MC inputs. Overall phono function is selected
with the main Selector switch (phono is one click counterclockwise from “1”
or one click clockwise from “6”).

PH1 is the MC phono input. It has 64 dB of gain, making it suitable for most
low output cartridges.

PH2 is the MM input, which provides 44 dB of gain, suitable for use with MM
(moving magnet) and many high-output MC (moving coil) cartridges.

Optionally, PH2 may be a second MC input.

 Both PH1 and PH2 may be connected in the same system, so that in essence
there are two phono inputs, selectable from the front panel.

Selector: 

This switch selects between IN1 through IN6 and the PHONO inputs. Rotate
counterclockwise to move down through the inputs, clockwise to move up
through the inputs.

Volume:

Controls the output level for the PHONO input, and any line input set to the
“VAR” LEVEL mode. Note: it is possible that one or both channels may not
shut off completely in the fully counter-clockwise position, and that channel
balance may skew at whisper levels.

Meters: 

Indicate the operating voltages within the unit. This will vary somewhat due
to fluctuations in power line voltage. 

Summary of Contents for Phi Beta Triode

Page 1: ...F The VAC Phi Beta Triode Preamplifier Operation Maintenance Information Valve Amplification Company Manual issued 02 15 2008...

Page 2: ...TUBES BECOME HOT ENOUGH TO CAUSE SERIOUS BURNS NEVER TOUCH A TUBE WHEN THE UNIT IS ON IT MAY TAKE SEVERAL MINUTES FOR THE TUBES TO COOL DOWN AFTER THE UNIT IS SWITCHED OFF IT IS STRONGLY RECOMMENDED T...

Page 3: ...ssible optimizing performance into either balanced or single ended loads and allowing ground loops to be broken The optional phono stage uses triode tubes operating without loop feedback Gain is moder...

Page 4: ...the connections used IMPORTANT READ THE SECTION ON OUTPUTS GROUNDING SWITCH 7 Output to a recording device tape recorder CD recorder etc may be obtained from the TAPE OUT jacks The adjacent switch for...

Page 5: ...y and be aware that different power cords can alter the sound The power supply s backlit meters show variation in power line voltage as reflected to the audio circuitry 12 12 volt triggers are provide...

Page 6: ...f using the tape outputs the TAPE OUT switch must be set to ON Two phono inputs are provided for MC and MM cartridges The ground lead from the turntable should be connected to the binding post located...

Page 7: ...sound may be different This is also normal for high resolution audio equipment Optimum sound should return after a few hours of operation preferably with an audio signal Note that although your VAC S...

Page 8: ...llumination In the VARIABLE mode the Phi functions as a conventional preamplifier The SET mode allows the control of volume to be determined entirely by the source component This is useful when the Ph...

Page 9: ...2 may be connected in the same system so that in essence there are two phono inputs selectable from the front panel Selector This switch selects between IN1 through IN6 and the PHONO inputs Rotate cou...

Page 10: ...wand is powered by two AAA batteries These should be of the alkaline type You will need to install them in the wand before using the remote Since batteries can leak they should be removed from the wan...

Page 11: ...s in the socket and pins of the tubes taking care to make sure that pin pattern corresponds to holes in tube socket Replace the cover before reconnecting and operating the preamplifier In the event th...

Page 12: ...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 th...

Page 13: ...ished in a durable black powder coat paint while the fascias are hand rubbed acrylic lacquer The lacquer should be treated in much the same fashion as a high quality automotive finish Never apply any...

Page 14: ...______________________________ ________________________________________________________________________ Telephone _______ _______ _____________ e mail __________________________________ Dealer name __...

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