D.W. Fearn VT-I/F - Manual (Page 13)

D.W. FEARN
VT-I/F Vacuum Tube Instrument Interface
15
FRONT PANEL CONNECTIONS (See Figure 2)
The VT-I/F has two identical channels, labeled A and B. They may be used indi-
vidually or simultaneously. These instructions apply to either channel.
The musical instrument output connects to the VT-I/F INSTRUMENT input (2)
via a standard 1/4 inch single-conductor (monaural) phone jack. The input is
unbalanced. Since the input cables carry very low level audio, it is important that
well-shielded cables are used. There should be no additional connectors, patch
jacks, switches, etc. between the instrument and the VT-I/F inputs. It is important
to keep the input lines as short as possible. Avoid locating the VT-I/F where it will
be subjected to high sound levels or excessive vibration (such as on a drum riser).
If desired, the musical instrument may be simultaneously connected to the input
to an external instrument (guitar) amplifier. The AMP jack (1) is a 1/4” single-con-
ductor (monaural) phone jack wired directly in parallel with the INSTRUMENT
jack.
Figure 2. VT-I/F Front Panel Controls and Connections
D.W. FEARN VT-I/F Vacuum Tube Instrument Interface
INSTRUMENT AMP INSTRUMENT AMP
A B
OUT
A
OUT
B
GND
LIFT
GND
LIFT
1
2
3
4
5