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INSERTION OF THE TUBES
The SFD-2 comes with two 6922 (6DJ8-type) tubes, individual-
ly boxed and bagged along with a cotton glove, screwdriver,
and screws for fastening the SFD-2 cover. If desired, replace-
ment of these tubes may be done to suit the listener's prefer-
ence. The following tube types will work under the same techni-
cal parameters as the 6922 and require no circuitry modifica-
tion to function:
• 7308/E188CC • 6DJ8/ECC88 • E88CC
Please read and follow these instructions carefully for initial
tube insertion or tube replacement.
1. Be sure that the AC DETACHABLE POWER CORD IS
D I S C O N N E C T E D from the SFD-2 before removing the chassis
cover.
2. Using a Phillips screwdriver, remove the cover of the SFD-2.
For convenience, only two of the screws are fastened.
3. When handling the tubes, it is recommended that the cotton
gloves provided be worn to prevent skin oils from depositing
on the glass surface and possibly causing the tube to become
prematurely "gassy", thereby shortening the tube's useful oper-
ating life.
4. Take a tube and inspect the pins, noting the larger space
between two of the pins. This space will align with the same
larger space between two of the pin holes on the socket. Insert
the tubes into the tube sockets, making sure all pins and pin
holes are aligned (see Figure 2). Do not force the tube into the
socket. "Rock" the tube gently while pushing slowly until the
tube is firmly seated.
5. Replace the cover and fasten it with the screws provided.
The SFD-2 is now ready for operation.
Figure 2 - Tube pin alignment with the socket.
W A R N I N G
D I S C O N N E C T the AC Detachable Power Cord from the SFD-2
b e f o r e removing the chassis cover.
Note the larger space
between two of the pins and
holes for proper alignment
of tube and socket.
OPERATION OF THE SFD-2 DIGITAL PROCESSOR
Before plugging in the SFD-2, check to see that the unit is config-
ured for the correct AC line voltage for country of use. The operat-
ing AC line voltage is indicated on the side of the shipping box. If
the SFD-2 Digital Processor is set incorrectly for the country in
which it is to be operated, contact the dealer or distributor in your
area. If the unit is configured properly continue with operation.
Connect the Detachable Power Cord to the SFD-2 chassis (see
Figure 1) and plug your SFD-2 into the AC power source.
Up to three digital sources or cables may be connected to the
appropriate input connectors on the rear panel (J, K & L) using an
ST (Glass Fibre) cable, an RCA Coaxial cable and an AES/EBU
XLR cable (see Figure 3).
Connect the left and right channel balanced XLR audio outputs (if
the existing amplification system is balanced) or the left and right
channel RCA coaxial (single-ended) into the corresponding left
and right channel line level audio inputs of the system's preampli-
fier, control amplifier, integrated amplifier or receiver (see Figure 4).
The SFD-2 Digital Processor is now ready for operation. Power
the unit by placing the Power Switch (E) in the OPERATE position.
As soon as the SFD-2 is plugged in and switched to OPERATE,
Figure 3- The digital source(s) output connections to the SFD-2
digital inputs. Up to three digital sources may be connected to the
SFD-2 Digital Processor via AT&T/ST Glass Optical, Coaxial RCA
and AES/EBU XLR interconnect.
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