Studio Projects VTB1 Wiring & Hookup Guide - Manual (Page 3)

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
- EXTERNAL PROCESSING UNIT -
TO RECORDER OR MIXER:
LINE-IN
-OR-
RING= Hot
SLEEVE= Ground
Studio
Projects
C1
Studio Condenser
STUDIO PROJECTS
(OR OTHER HI-QUALITY)
MICROPHONE
VTB-1
REAR CONNECTIONS
VTB-1
FRONT CONTROLS
INPUT GAIN: SETS THE LEVEL OF
SIGNAL FEEDING THE EXT GEAR
HI-PASS FILTER: AFFECTS SIGNAL
GOING TO THE EXTERNAL GEAR
TUBE-BLEND: AFFECTS THE SIGNAL
RETURNING FROM THE EXT GEAR
METER SELECT: LETS YOU VIEW SIGNAL GOING
TO THE EXTERNAL GEAR (IN),
OR FEEDING THE RECORDER (OUT)
OUTPUT LEVEL: SETS THE AMOUNT OF
PROCESSED SIGNAL FEEDING THE RECORDER
POLARITY REVERSE: INVERTS THE
POLARITY (PHASE) OF THE SIGNAL
FEEDING THE RECORDER
STUDIO PROJECTS Often, when recording, additional control is desired when tracking a signal. Most external processing
gear is designed for line-level operation and will not operate properly if fed directly from a
microphone-level input signal. The VTB-1 provides an Insert Jack at line-level strength to properly
interface to most gear. The Insert send-point is directly after the SS preamp and Hi-Pass filter
sections, the return-point feeds the Tube Blend control. The Insert Jack is a 1/4” TRS jack and
is wired as Tip= Insert-send, Ring= Insert-return, Sleeve= Ground. The nominal operating level
at this point is approx 0dBu. When a compressor is being used, use the Meter (IN) to monitor the
internal level and use the Gain control to set the SS preamp to a conservative level (keep levels
below 0 on the meter). This leaves more headroom in the first, critical stage. Then use the controls
of the external compressor to keep the dynamics within the desired range.
VTB-1 HOOKUP DIAGRAM
Add an equalizer, compressor
or other equipment to the
signal path before recording.
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.
TIP= Hot
SLEEVE= Ground
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.
Using external processing gear
with the VTB-1
Insert
Return Insert
Send
NOTE: Plugging into the Insert
Jack interupts the normal signal
flow thru the VTB-1. If the Ext
Gear is OFF, or its output is
muted, no signal will show in
the meter (OUT) or be present
at the Bal Out or Line Out of
the VTB-1.
1/4” TRS
Insert Plug
Line In Line Out
NOTE: 1/4” connectors
shown, but use the
correct cable and
connectors for your
particular setup.