Vac phi 110110 owners manual
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Extracted text from vac phi 110110 owners manual (Ocr-read)
Page 1
PLEASE READ CAREFULLY Your Phi Beam Power amplifier is fitted with a unique output tube monitoring circuit. Rather than directly contacting the audio path, and thus contaminating the pure sound, the temperature of a small cathode resistance is sensed. The four bi-color LEDs on the front panel indicate the tubes conditions. If the idle current of a KT88 output tube drops below nominal limits, the LED corresponding to that tube will light green. This indicates that either the bias setting for that tube should be adjusted, or the tube should be replaced at your convenience, but it is safe to continue operating the amplifier. The exact idle current of each tube may be tested by means of the meter and the test switches located on the front panel. The associated bias control should be adjusted so that the needle points directly at the dot in the center of the meter. When no test switch is selected, the meter indicates the incoming ac voltage (wall voltage). Note: These LEDs will also be green when the amplifier is first switched on, and will extinguish when the bias resistors have reached full operating temperature after approximately 30 minutes. The threshold between green and no illumination is not precise; do not be overly concerned if some positions take longer to extinguish. The condition of individual tubes may be checked with the built in meter. Note: a strong air current could cause the lights to remain green even in normal operation. In the event that any output tube draw excessive idle current (a run away tube or a tube not biased correctly), the high voltage supply in the amplifier will shut down automatically and the LED corresponding to the problematic KT88 tube will indicate red. The red light will stay on until the power switch is turned off. This tube must be replaced. (Note: The LEDs for the other tubes will show green after a few minutes...this should be disregarded.) To minimize difficulties, always source genuine VAC Tested audio tubes for your Phi.
Page 2
1 CAUTION THE AMPLIFIER AND POWER SUPPLY CONTAIN NO USER SERVICEABLE PARTS. DO NOT REMOVE THE BOTTOM PLATES OR CHASSIS COVERS. LETHAL VOLTAGES ARE PRESENT WITHIN THE CHASSIS. DO NOT OPERATE THE UNITS IF THEY ARE WET. VACUUM 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 THAT THE TUBE COVERS BE LEFT IN PLACE AT ALL TIMES. THE TUBE COVERS WILL BECOME HOT IN NORMAL OPERATION. DO 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 BACK STRAIN AND INJURY. BE CERTAIN TO INSTALL IT IN A SECURE LOCATION FROM WHICH IT CAN NOT FALL OR TIP OVER. INDEXIntroduction Unpacking & Assembly Installation Input connectors Operation Feedback Triode & Ultra-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