6
TUBE VITALIZER
The Tube Vitalizer is fitted with both XLR-connectors and TRS
stereo jacks for balanced operation, though the jacks may be
used with unbalanced connections simply by plugging in mono
jack-plugs. The level difference that normally occurs when a
balanced input or output is used unbalanced is automatically
compensated for.
Should the need arise to use the XLR connectors in an unba-
lanced system, pin 3 of the XLRs should be grounded. Inserting a
mono jack also unbalances the XLRs.
Both output stages operate in parallel, so it is possible to
connect two different destination units simultaneously, for
example to record to two different media at the same time or split
the output between a mixer and effects processor. However, only
one type of input (jack or XLR) should be connected at a time –
the Tube Vitalizer is not intended to be used as a mixer!
To ensure optimal signal quality, SPL has developed a new
hybrid-component balanced input/output stage using all laser-
trimmed resistors with a tolerance of 0.01%. This approach has
resulted in an exceptionally high CCMR (common mode rejec-
tion); 100 dB at 1 kHz and 80 dB at 10 kHz.
As a precaution, before connecting the Tube Vitalizer switch off
the power to the unit and to all connected units.
Other rear panel connections and switches:
• Voltage selector: 220-240 V / 50 Hz or 100-120 V / 60 Hz
• CSA/UL approved 3-pole power plug
• GND-Lift switch
Connections
Pin wiring: Stereo Jack plug
Tip=Hot(+) Ring=Cold(-) Sleeve=GND
1
2
3
Pin wiring: XLR connectors
1=GND 2=Hot(+) 3=Cold(-)
