Specifications - Sunfire Classic Vacuum Tube Preamplifier User Manual

User's Manual

Specifications

Phono Inputs
RIAA curve
Moving Magnet input
Gain = 40dB to tape out
Overload = 100mV @ 1 kHz.
Input Impedance = 47Ω
Noise: better than 82 dB, IHF-A,
Moving Coil input
Gain = 60dB to tape out
Overload = 5.60 mV @ 1 kHz.
Input Impedance = 470Ω standard,
(setable to 22Ω, 47Ω, 150Ω or 470Ω)
Noise: better than 76 dB, IHF-A,
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 50kΩ
Power Consumption
45 Watts
25 Watts
1.4 Watts
Finish
Black anodized front panel and cover
Dimensions
19" wide x 6.5" high x 18" deep.
Weight
25 pounds
Specifications
18
below 10mVrms at 1 kHz
below 1000 µVrms at 1 kHz
with Phono option
without Phono option
remote standby (i.e. when it
has been turned off using the
remote control)
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