Mic
Impedance
Mic
In
Balanced
Out
Line Out
12VAC
50
Ω
200
Ω
Insert
Tip=Send
Ring=Return
48
Volt
Meter
Input
Gain
Line In
Tube
Blend
Output
Level
Studio Projects
Tube Mic Pre
-8 0 +8 +15
-20
6
0
6
12
•
70Hz
Output
4
2
=
2
4
3
3
1
1
Line
In
Pol
Rev
Level
Input
HPF
SS
Tube
6
30
50
60
0
20
40
25
+
–
TIP
RING
SLEEVE
CLEAN OUTPUT:
To Recorder or Mixer.
Only affected by GAIN
and HPF controls.
NO TUBE SOUND
Studio
Projects
C1
Studio Condenser
STUDIO PROJECTS
(OR OTHER HI-QUALITY)
MICROPHONE
VTB-1
REAR CONNECTIONS
VTB-1
FRONT CONTROLS
INPUT GAIN: CONTROLS THE LEVEL
OF BOTH OUTPUTS
HI-PASS FILTER: AFFECTS SIGNAL
GOING TO BOTH OUTPUTS
TUBE-BLEND: ONLY AFFECTS THE ENHANCED
OUTPUT. USE IT TO ADD TUBE COLORING TO
THE ENHANCED OUTPUT
METER SELECT: LETS YOU VIEW EITHER
OF THE SIGNALS. CLEAN (IN),
OR ENHANCED (OUT)
OUTPUT: SETS THE LEVEL OF THE
ENHANCED OUTPUT ONLY
POLARITY REVERSE: INVERTS THE
POLARITY (PHASE) OF THE ENHANCED
OUTPUTS ONLY
Because of its specially designed signal path, the VTB-1 can be used to generate two
distinct outputs by using its Insert Jack as an additional output. The insert point is after
the HPF, but directly before the Blend Control. The signal feed from the insert jack is
before any tube circuitry, so the additional output will always be a SS only signal. The
insert cable needs to be wired as a “Borrow Cable” by tying the Tip and Ring connections
together. This allows the insert signal to feed the outside world but still continue through
the VTB-1 in its normal way. By using the Blend control, the user can add the desired
amount of Tube Sound to the main (Enhanced) outputs while still having a clean, all
solid-state output also available.
NOTE: 1/4” connectors
shown, but use the
correct cable and
connectors for your
particular setup.
TIP & RING= Hot
SLEEVE= Ground
NOTE: TIP & RING
tied together
Connections to the
1/4” TRS Insert Plug:
NOTE: Microphone
input shown, but this
setup works the same
way for Line-In signals.
Use the front-panel
jack and switch to bring
instruments into the
VTB-1.
STUDIO PROJECTS
VTB-1 HOOKUP DIAGRAM
Using the VTB-1’s Insert jack,
a clean (all SS) signal, as well
as a Tube Sound signal, can
be
simultaneously
generated.
Using the VTB-1 for generating
two different sounding feeds.
NOTE: Plugging into the Insert
Jack interupts the normal signal
flow thru the VTB-1. If the jack
is not wired with the TIP and
RING tied together, no signal
will show on the meter (OUT)
or be present at the Bal Out or
Line Out of the VTB-1.
1/4” TRS
Insert Plug
ENHANCED OUTPUT:
To Recorder or Mixer.
Affected by Gain
and HPF controls
PLUS
the Blend, Output and
Polarity Controls
NOTE: The VTB-1 meter is calibrated
for Pro level operation (+4dBu). The
meter may stay in its lower ranges when
driving semi-pro gear (-10dBV levels).
If your equipment has a level-select
switch, set it for +4 operation for best
results and quietest operation.
