6
7
TUBE LOADING CONTROL
LOADING
controls how the input signal is affected as it travels through the P331’s fully
balanced class-A tube amplifier. This rotary switch ensures your settings are always precise
and repeatable. How and where the input signal hits the tube along its response curve
depends on dial settings as well as which
MODE
the unit is operating in. More detailed info in
the
OPERATION
section of this manual.
MODE SELECTOR
The P331’s
MODE
section is controlled by a three position “momentary” toggle switch. When
this switch is flipped and held all the way to the right for “a moment” you’re able to select
between three auto-pad settings. Within each of these three settings (
PRE
,
POST
and
OPEN
)
you can control whether the unit will be operating in
CLEAN
(Feedback) or
BLOOM
(Feed-
forward) mode. Again, we’ll go into further detail in the
OPERATION
section.
LIFT SELECTOR
The four position
LIFT
selector switch allows you to engage or fully bypass the P331’s parallel
lift circuit and select between its three settings. The
LIFT
filter is a gentle boost of high
(HF)
,
low
(LF)
or both high and low frequencies
(DUO)
as they pass through and are affected by
the tube
LOADING
circuit. It can be used to add subtle energy to your audio signal where
necessary without sounding or feeling like heavy-handed equalization.
XFORMER SELECTOR
The P331 is designed to run fully transformerless but offers the option of adding an output
transformer into the signal path for additional texture. The
XFORMER
circuit allows you to
select two different ways of loading the transformer (
1
or
2
) or can be fully bypassed (
OUT
).
BOOST/CUT SELECTOR
The
BOOST/CUT
selector switch toggles the fully balanced solid-state output
GAIN
control
between
BOOST
mode,
CUT
mode or
OUT
which completely removes the
GAIN
circuit from
the audio path. There is an indicator LED that will alert you when
CUT
mode is engaged.
GAIN CONTROL
This rotary switch allows for up to 11dB of boost or cut in 1dB increments. The output
GAIN
circuit is a fully balanced low distortion solid state amplifier designed to faithfully reproduce
the sound of the audio passing through the tubes and other circuits of the P331.
RESOLUTION SELECTOR
The
RESOLUTION
switch allows you to “back-off” 0.25dB or 0.5dB to whatever setting you
have dialed in on the
GAIN
control. Great for level matching or for getting just the perfect
amount of gain out of the unit.
VU METER
The VU Meters are calibrated to “0VU” = +4dBm.
METER ATTENUATION
The P331 is designed to work with hot signals at times so we offer the option of a 6dB or 9dB
pad on the meter.
BYPASS
The
BYPASS
is a true hardwire bypass which effectively removes the entire unit from your
signal path. When it’s out...it’s out.
INDICATOR PILOT LIGHT
The P331 is designed with a timed soft-start power-up that applies voltage to the tubes
gracefully. This can help increase tube life and performance over the life of your unit.
During power-up, you will see the INDICATOR PILOT gently pulse on and off as this process
takes place. During this “warm-up” period the output is automatically muted. When the
P331 is ready for use (approximately 3 minutes) the pulsing will stop and the muting will
automatically disengage.
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FEATURES & CONTROLS
A
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The P331 is digitally controlled analog. All switches (rotary and toggle) accurately and
predictably command over 80 sealed precision relays. No audio runs to the unit’s front panel
and only the finest components are used thoroughout the audio path.
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