Warnings
1
. Do not touch hot tubes. Keep away from children.
2
. To prevent fire or shock hazard, do not expose your
VS115 to rain or moisture.
3
.
This unit contains voltages which can cause serious
injury or death. Do not operate with covers removed.
Refer servicing to your authorized Audio Research dealer
or other qualified personnel.
4
. The 12-gauge, 3-conductor detachable power cord on
your VS115 is equipped with a standard 3-prong ground-
ing plug. If used normally, it will provide a safe earth
ground connection of the chassis. Refer to the section on
“AC Power Connections” for detailed information.
5
. For continued protection against fire hazard,
replace fuses only with the same type and rating of fuses
as specified.
Preparation for Use
Your VS115 amplifier is shipped with the vacuum tubes
packed in foam blocks. These must be unpacked and
installed before you attempt to operate the amplifier. In-
cluded are four matched pair of 6550C output tubes, and
four 6H30 dual triodes used in the input stage. Proceed
according to the following instructions.
1
.
Carefully remove each vacuum tube from its
protective foam and match its location “V” number
(written on the base of the tube) to the “V” number
printed next to each socket. Firmly seat each tube in its
matching socket, taking care to “key” the tube pins to the
socket holes. Retain the foam blocks with other packing
materials for possible future use.
2
.
If you are using the optional tube cover, be sure the
VS115 is first turned off and then remove the top plate
with the phillips screwdriver provided with the tube cov-
er. Install the tube cover in place of the top plate,
using
the new screws supplied.
Panel Controls
The front panel has:
1 – Switch:
1
- Power line On-Off
1 – Indicator:
1
- Power "On" LED (Green)
Use of Controls
POWER-ON SWITCH
:
Initiates/terminates AC line power
to the amplifier. Function indicated by green LED above
switch.
N o t e :
Audio Research does
n o t
recommend leaving your
VS115 “on” 24 hours a day as is the custom of some audio-
philes to achieve maximum sonic performance on demand.
While this is often recommended for solid-state equipment,
Audio Research does not recommend this procedure for
vacuum tube power amplifiers. (2,000 hours of tube life will
pass by in 84 days!)
Installation
To insure normal component life and safe operation this
unit
must be operated only in a horizontal (upright) posi -
t i o n .
Adequate air flow and proper cooling thereby can
occur only if there is no restriction
below, behind and
above
the unit.
The five special non-marring elastomer feet provide
adequate spacing only from a smooth, hard surface.
Never
operate the unit while it is sitting on a surface such as
a rug or carpet.
If the unit is to be operated in an enclosed equipment
cabinet, an exhaust fan is desirable so as not to operate the
VS115 in overheated ambient air. The “ambient” operating
temperature should never exceed 120º F or 49º C.
Improper installation will cause premature tube failure
and will affect your warranty, as well as the service life of
the unit.
It is normal for a vacuum tube power amplifier to run quite
warm, and if used for prolonged periods,hot to the touch.
All components within are, however, operated at safe,
conservative levels and will not be improperly affected
thereby, providing the requirements outlined above are
adhered to.
Connections
The rear panel has:
2
– BAL input connectors (for balanced connection, L & R).
2
– RCA input connectors (for single ended connection,
L & R) See Single Ended Operation and Balanced
Operation paragraphs for instructions on use of
jumpers for SE operation.
2 –
Jumper sockets for single ended operation, L & R.
6
– Output binding posts (+) and (-), L & R, for 4 or 8 ohm
speaker connection.
1 –
Power line cord 20A IEC inlet connector for removable
power cord (supplied).
1 –
Power line fuse holder.
2 –
12V remote start in and out jacks.
8 –
Pairs bias test jacks, one pair for each output tube.
IMPORTANT:
Use the best available speaker wires and
interconnects. Audio Research cannot emphasize this
enough. As better components and systems are developed,
it becomes increasingly important to avoid the limitations
of inferior system interconnections.
Summary of Contents for VS115
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