Guidepost Of The Front Panel; Supplementary Descriptions - Alto Mini-Tube User Manual

a. Guidepost of the front panel
(1) VU Meter (volume indicator for output signal)
(2) 20dB PAD
(3) Phase Reverse Switch
(4) +48V Phantom Power Switch
(5) 80Hz Low Cut Switch (filter low frequencies below 80Hz)
(6) Gain Control (0 to +40 dB)
(7) Drive Control (0 to +20 dB)
(8) CLIP Indicator (indicating for clipped signal over +20dBu)
b. Supplementary Descriptions
-
Phantom Power Switch (4):
This switch activates the +48 volts phantom power to supply condenser mics and
any other devices requiring continuous power by means of the XLR cable. The +48V
is applied both to the positive (pin2) and negative inputs (pin3) of the XLR connector:
XLR Connector
PIN1 ( Ground )
PIN2 ( Positive )
PIN3 ( Negative )
Caution: Please make sure that you are using an appropriate microphone before
you activate this switch to supply the +48V phantom power. Read the operating
instructions accompanying the microphone. Some condenser mics might need
another type of power supply, old dynamic microphones could be damaged by
the +48V voltage, and unbalanced microphones should never be operated in
combination with a +48V power supply.
-
Phase Reverse Switch (3):
This Phase Reverse Switch reverses the audio signal's phase by 180 , Normally,
you won't need this switch, however, in some cases, it might be necessary, for
example: the inversion of the pins of the XLR connector may be necessary to
alter the audio phase of linked microphone to compensate for phase cancellation.
It may be required that the wiring of a cable's XLR connector be switched to success-
fully utilize Phantom power.
-
20dB Pad (2):
A 20dB Pad is designed to attenuate the incoming signal level to provide increased
"headroom" for the operator.
-
Gain Control (6):
This control sets the amount of boost to the signal being processed by this pre-
amplifier. Use this control to adapt the Mini-Tube to either home recording level
Phantom
Power Supply
GND
+48V
+48V
6