Decware SE-84-CSP Owners manual
OPERATION MANUAL
Model SE84CSP
LINE LEVEL STEREO PREAMPLIFIER
MANUFACTURED by DECWARE / High Fidelity Engineering Co.
1202 N.E. Adams Street, Peoria IL 61603
USA
www.decware.com
GENERAL DESCRIPTION
The SE84CSP is a line level stereo preamplifier with gain. It is an all tube design
that has been point to point wired and uses no solid state parts or circuit boards.
This ensures top quality sound and extreme reliability.
It features a front mounted volume control that will raise or lower the output level of
both channels evenly. There is no fidelity robbing balance control. Also featured
are two pair of standard RCA type inputs with a front mounted toggle switch to select between source A and source B.
SETUP
The SE84CSP is easy to set up. The tubes are not installed when it ships to prevent breakage. It comes with a total of 4 tubes. The largest one is called a
“rectifier” and locates just in front of the power transformer. It fits into an octal (8
pin) tube socket. This is the only 8 pin socket on the unit so there is no worry of putting the rectifier tube into the wrong location. The rectifier tube shipped with the preamp is typically going to be a 5Y3GT. You can also substitute a 5AR4 or 5U4 type
rectifier in place of the 5Y3GT.
The smaller tubes (9 pin) shipped with this preamp are 6922’s. They go into the
white ceramic 9 pin sockets. Since all three are the same it does not matter which
ones go where, but all three must be installed for the preamp to work.
All of the tubes simply plug into the tube sockets with a firm downward force. It is
important to check the pins on the tubes PRIOR to installing them to be sure they
are not bent. Installing tubes with bent or crooked pins could damage the tube
sockets.
After all tubes are installed in the preamp, install the removable power cord into the
rear located IEC connector, turn the volume control all the way down and turn on
the preamp. The power switch is located on the rear of the preamp. Like all tube
gear it will take up to 30 seconds for the tubes to warm up before the preamp will
begin to work.
Once the preamp is on and warmed up for a few minutes, you can connect your
power amplifier to it using standard RCA type interconnect cables. The output
jacks on the preamp are located on the left hand side next to the power switch.
After you have connected your amplifier to the preamp and the preamp is on and
warmed up, turn on your amplifier. Make sure the preamp and amplifier are plugged
into the same electrical outlet so you don’t develop ground loops which can cause
hum. With the volume control still turned down all the way and the amplifier turned
on, you should hear no hum come from the loudspeakers above the level of hum
your amplifier normally has.
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