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Model SP17
Operating Procedure
Start-Up:
1. Secure all rear-panel connections between SP17, power
amplifier(s) and input sources.
2. Plug 3-prong powerline cord from rear of SP17
into grounded AC wall receptacle. (Power on/off switch
defaults to "o ff" position when unit is plugged into
power receptacle.)
3. Turn Power switch to "on". The Mute LED will flash for
approximately 30 seconds while power supply stabilizes,
indicating
operation
circuit. After this automatic muting period the LED
will stay on, indicating that your SP17 is in the "mute"
position. Adjust the Volume control to the minimum
level, as indicated by illumination of the first (left-most)
Volume LED. When the "o p e r a te" position is manually
selected the Mute LED will turn off, indicating the SP17
is ready for operation.
Note: For superior sonic performance, a warm-up period of
at least one hour is recommended. In addition, your
SP17 may be safely left "on" continuously for maximum
performance at all times, but at the expense of higher
maintenance costs (more frequent tube replacement).
4. Press Input selector for desired source; set remaining
switch options to desired positions.
5. Activate selected input source, then deactivate Mute
switch and adjust Volume control as necessary.
Shut-Down:
1. Set Mute switch to "Mute" position.
2. Adjust Volume control to minimum setting (left-most
first volume LED lit).
3. Turn off power amplifier(s).
4. Turn off all input sources.
5. Push SP17 Power switch to "off " position.
Phono Cartridge Output Compatability
The SP17 optional phono stage (offering a total of 57.5dB
combined phono and line stage gain) is intended to work
with moving magnet and higher output moving coil
cartridges ranging between 1mV and 5mV output.
Depending on the efficiency of your speakers and
sensitivity of the power amplifier(s), a cartridge with
slightly lower than 1mV output may provide suitable gain
through the SP17 in your system.
Tape Recording Procedure
When using the SP17 as a control center for recording, the
program source to be recorded must be connected to one of
the five inputs controlled by the Input selector switch. This
routes the selected program to the Record output.
of
automatic
muting
It is also possible to dub from one tape deck to another.
Simply connect the output from one tape deck to an
unused set of inputs controlled by the Input selector
(tuner, aux, etc.) on the SP17. This signal will then be
routed to the second tape deck when the appropriate input
is selected by the Input selector switch.
Muting Provisions
The SP17 has several provisions to help protect against mis-
use of the exceptional dynamic range and wide bandwidth
that it offers. It is not subject to damage itself, but some
power amplifiers and speakers are more limited in their
ability to withstand signal extremes. These provisions,
both manual and automatic, are designed not to
interfere with the listening experience, while giving reason-
able protection against warm-up surges and power line
interruptions. However, for absolute protection of associat-
ed equipment some operator understanding and responsi-
bility are required.
Initial "s e t t l i ng" time of all circuit parameters within
the SP17 requires approximately 5 to 10 minutes. The auto-
matic muting circuitry timer is adjusted for about 30
seconds. (This is because recurrent interruption "s e t t l i ng"
time is much less. You would not want to wait for 5 to 10
minutes each time such an interruption occurred.)
The Mute/Operate switch allows manual disabling of the
SP17 outputs during the switching of equipment. Use of
this switch will minimize stress on your amplifier even if it
is "off". It is also highly recommended that manual muting
be employed during turn-off for maximum protection.
The automatic muting operates as follows:
1. The automatic muting always disables all outputs and
overrides any manual settings. (The "operate" position of
the manual Mute switch is functional only when the unit
is not in the automatic mute mode.)
2. The 30- second warm-up timer will restart auto-
matically and the LED will flash if the power is
temporarily interrupted for 0.1 second or more.
Not e : Power supply regulation of the SP17 is effective
down to 100VAC without serious sonic degradation.
3. The automatic muting of the SP17 is designed to be
effective only against power line interruptions and
power line failures. It will not mute against subsonic
signal transmissions from your input source. Proper
fusing of speakers is essential to protect against
excessive audio level or power amplifier faults.
Servicing
Because of its careful design and exacting standards of
manufacture, your SP17 should normally require
only minimal routine service to maintain its high level
of performance.
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