Sunfire Classic Vacuum Tube Preamplifier - Manual (Page 18)

18
User's Manual
Phono Inputs
RIAA curve
Moving Magnet input
Gain = 40dB to tape out
Overload = 100mV @ 1 kHz.
Input Impedance = 47
Ω
Noise: better than 82 dB, IHF-A,
below 10mVrms at 1 kHz
Moving Coil input
Gain = 60dB to tape out
Overload = 5.60 mV @ 1 kHz.
Input Impedance = 470
Ω standard,
(setable to 22 Ω, 47Ω, 150Ω or 470Ω)
Noise: better than 76 dB, IHF-A,
below 1000
µVrms at 1 kHz
High-Level Inputs
Frequency response
5 Hz to 50 kHz +0/-3dB
Line Gain = 12dB
Infrasonic Filter
18 dB per octave below 10 Hz
Noise
better than 96 dB, IHF-A, below 2 Vrms.
Distortion
THD: 0.5% or less, below 3 Vrms out.
IM (CCIR or SMPTE): 0.5% or less.
TIM unmeasurable.
Input Impedance nominally 50k
Ω
Power Consumption
45 Watts with Phono option
25 Watts without Phono option
1.4 Watts remote standby (i.e. when it
has been turned off using the
remote control)
Finish
Black anodized front panel and cover
Dimensions
19” wide x 6.5” high x 18” deep.
Weight
25 pounds
Line Voltage
Units built for 110V-120V line voltage can
be converted to 220V-240V by means of a
modification. This is not simply a switch, and
must be performed by a Sunfire Authorized
Service Station. Contact Sunfire Technical
Services for more information.
Muting System
The Sunfire Classic employs an electronic
“clamper” to mute the main outputs to elimi-
nate turn-on transients. (It will not interrupt the
tape outputs).
Muting is accomplished by a shorting
relay which, when it is “open”, is out of the
circuit and hence has no effect on the signal.
It is controlled by a toggling device, so muting
cannot be partially “on”.
This muting system will turn off the signal
to your power amplifier at these times:
• For about 40 seconds after the initial
power-on, whether by the front panel
power switch or the remote control.
• Immediately at turn-off, whether by the
power switch or the remote control.
• The main outputs will also mute if the
line voltage drops below 70 volts. This
is to reduce thumping.
Output impedance
The output impedance of the Classic is a
low 1.5K ohms, so it can drive power amplifi-
ers having virtually any input impedance.
Options include connecting several power
amplifiers to the Classic’s main outputs, to
separately drive different speaker sets, or the
use of extra-long connection cables to drive
power amplifier(s) located close to the speak-
ers, or self-powered loudspeakers. Conven-
tional cables as long as 30 feet, or special
low-capacitance cables as long as 60 feet,
may be used to drive power amplifier(s)
without difficulty.
©2001 Sunfire Corporation. All rights
reserved. Sunfire Corporation reserves the
right to improve its products at any time.
Therefore, specifications are subject to
change without notice.
Manual Part number : 913-012-00 Rev C
Specifications
Specifications