VAC Phi "Kappa 30i" - Manual (Page 16)

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channels being set by the player or the decoder.
Note: The Tape Monitor takes the same setting as the source input. For
example, if the SELECTOR is on input #1 and #1 is set up in a SET mode,
when you engage the TAPE monitor it will also be in the SET mode, and the
VOLUME control will not change the sound level. Conversely, if input #2 is in
the VAR mode, then the TAPE monitor will also be in the VAR mode, and the
volume control will function.
Therefore, it is suggested that the input be
configured to VAR before recording and monitoring is started.
The SET mode may also be used with, for example, a CD player that has its
own volume control. In this way, the Phi’s volume control is bypassed. Some
audiophiles would consider this to be a “hot rod” mode.
Meter: Indicates the operating voltage within the unit. This will vary somewhat due
to fluctuations in power line voltage.
Test: There are two “Test” switches,
used to check the idle current of
the 300B output tubes. The
switch on the left side tests
tubes V13 and V14; the one on
the right side tests tubes V15
and V16.
To test a 300B, push the toggle switch to the direction of the desired tube.
Observe the meter. When properly adjusted, the needle will point straight
up. It must never be set for a higher reading.
Also associated with the tube legends are four bicolor LED’s. These will be
green until the amplifier warms up. If one remains green, it indicates that the
tube is no longer drawing sufficient current and should be replaced. If one
turns red, it means that tube conducted excessive current, and the amplifier
automatically shuts down.
Excessive current normally is the result of tube failure. Replace the tube if the
protection circuit continues to trigger.