Fisher K-10 Spacexpander User Manual

THE FISHER K-10 Dynamic SPACEXPANDER@ Reverberation Unit

The FISHER
monophonic) home music systems Natural reverberation is created by the reflections (echoing) of
sound from the walls and ceiling Reverberation is just an echo
listeners ear a fraction of a second after the sound from the original source is heard For example,
in a large room or auditorium a single hand-clap is heard several times -first as a direct sound
impulse, then as reflected sounds (echoes) with each one weaker than the one heard a fraction of
a second before This dying out of sound is called "decay" -It depends on the size and shape of the
room or auditorium, the covering on the walls and ceiling as well as the furnishings, the number
of people and other objects contained in the enclosed area Unconsciously we estimate the size of
an area by the amount of reverberation (how much the echo is delayed and how long it takes to
decay)

The FISHER
phonographs but it can be connected into other home music systems with a few, slight, changes in
the original circuit even if it was not designed to use a
FISHER Direct Tape Monitor system of tape recording

While the FISHER
panel control) positioning of the reverberation unit is most critical and it must be installed
exactly as illustrated and connected as indicated if you want to obtain the best possible results from
the

Spacexpander

There are many ways of connecting a
connections, for the most common high-fidelity component combinations, are given here- use the
connection instructions for the equipment which most nearly matches those used in your music
system.

Spacexpander

Spacexpander

Spacexpander

adds a new dimension -reverberation -to most stereophonic (or

a sound which reaches the

is designed to be used with FISHER high-fidelity components and radio

Spacexpander

is easy to install and simple to operate (there is only one front

Spacexpander

into a home system. The most frequently used

or does not make use of the

-

-

If none of the connection diagrams seem to be suitable for your system write

Customer Relations Department, Fisher Radio Corporation, Long island City, NY.

include the make and model, and schematic diagrams, of all units in your home music system
Remember, the
commercial recording, broadcasting or industrial installations or for use with amplifying
attachments for musical instruments, like guitars, or electronic organs. Information regarding
connections to systems other than home music types will not be supplied,

Spacexpander

is designed -specifically for

UNPACKING THE SPACEXPANDER

Carefully check the shipping carton to make sure that all the units and interconnecting cables
are removed. The carton should contain the following items;

1 Reverberation Chassis.
1 Electronics Chassis.
1 Control Unit (with knob, control plate and 4-foot interconnecting cable).
6 Audio interconnecting cables

Remove the tillers from the carton, if necessary, to make sure that none of the cables are
overlooked or small parts discarded.

INSTALLATION PRECAUTIONS

•

Electronics Chassis may be installed in any position.

•

Electronics Chassis
overheating.

•

Reverberation Chassis

•

Reverberation Chassis

•

Reverberation Chassis

•

Control Unit cable may be increased to 12-feet total length.

•

Connecting cables between the Electronics Chassis and the Reverberation Chassis
increased to 20-feet total length.

•

The power cable of the Electronics Chassis must be connected to a
(outlet) on the associated high-fidelity instrument

•

The Spacexpander MODE SELECTOR switch must be set to proper position

must

be placed so that air can circulate around it freely to prevent

must
must
must

home

be mounted with its flanges in a vertical plane (as illustrated).
be mounted with complete shock
be isolated from mechanical vibrations from speakers.

music systems and not for

mount material, as supplied.

switched

Richard Hamilton,

11101 Be sure to

may be

AC receptacle

USING SPACEXPANDER JACKS ON FISHER INSTRUMENTS

There are no problems when making connections to a FISHER stereo instrument with

Spacexpander

interconnecting cables. DO NOT discard the jumpers (They can be handy when troubleshooting the
home music system). The jumpers
These jumpers complete the internal signal paths -without them the home music system will not
play; no sounds, except for a slight hiss or hum will be heard from the speakers.

jacks Just pullout the pair of horse-shoe shaped jumpers and insert the plugs of the

must

be reinserted when the

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CONNECTIONS

is disconnected.

Make the following connections between the
instrument

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jacks using 4 of the 6 audio interconnecting cables.

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Electronic Unit and the FISHER

• Left TO REVERB IN jack connected to
(left) A INPUT of

• Left TO REVERB OUT jack connected to
(left) A OUTPUT of

• Right TO REVERB IN jack connected to
(right) B INPUT of

• Right TO REVERB OUT jack connected to
(right) B OUTPUT of

Make the following connections between
the

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the Reverberation Chassis using 2 of the 6
audio interconnecting cables.

• INPUT jack of Reverberation Chassis to
jack marked TO INPUT OF REVERB UNIT
(chassis)

• OUTPUT jack of Reverberation Chassis to
jack marked to OUTPUT OF REVERB UNIT

• Set

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to NORMAL.

Spacexpander.

Spacexpander

Spacexpander.

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Electronics Chassis and

MODE SELECTOR switch

.

Connecting to FISHER instruments with Spacexpander jacks is the easiest installation because
these instruments were designed to go together.

USING FISHER DIRECT TAPE MONITOR JACKS AND SIMILAR CIRCUITS

(for connecting Tape Recorders with separate Record and Playback heads).

The Direct Tape Monitor jacks are connected into the circuit in almost the exact same manner as
the

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selected by a front panel switch.

CONNECTIONS

The OUTPUT jacks, on the home music system instrument, may have exotic trade names or may be
labeled simply, like TAPE OUT, RCRDR OUT, etc. These jacks are connected to the A (left) and B
(right) inputs of the

jacks with but one exception -the jacks do not need jumpers because they are

Spacexpander.

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may be labeled MONITOR, MON, TAPE MON, TAPE IN, TAPE PLAY, etc., Make sure that the cables are
not crossed -the right-channel cables must connect to the right-channel jacks (and left to left)
throughout the system.

Make sure Spacexpander MODE SELECTOR switch Is set to NORMAL position for first listening tests,

Set DIRECT TAPE MONITOR switch to ON position.

OUTPUTs, A (left) and B (right), are connected to the home music system jacks that

SEPARATE PREAMPLIFIER/POWER AMPLIFIER CONNECTIONS

When separate control-preamplifier and power amplifier units are used in a home music system it
is just as easy to connect the
interconnecting cables between the control-preamplifier
about the same electrical connections as the horse-shoe shaped jumpers in the FISHER
instruments with the

With some home music system components a slight increase in the audible hiss level may be
noticed This noise level
amplifier chassis (when such a control is provided). The outputs from the control preamplifier

must

be increased to as high a level as possible (without distorting or unbalancing the sound

heard from the speakers

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can

be reduced by turning down the input-level controls on the power

jacks.

as when

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and

jacks

power amplifier units make just

are

provided The

CONNECTIONS

For a home music system using separate control-preamplifier and power amplifier make the
following connections to the

Spacexpander;

• Control-preamp LEFT OUTPUT connected to

• Control-preamp RIGHT OUTPUT connected to

• Spacexpander

• Spacexpander

A OUTPUT connected to power amplifier LEFT INPUT jack.
B OUTPUT connected to power amplifier RIGHT INPUT jack

ADDING SPACEXPANDER JACKS

Jacks for
decide
schematics

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where

are

interconnecting cables can be added to most home music systems -just

to break into the signal path and

indicated by the heavy line.).

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where

A INPUT jack.

B INPUT jack.

to mount the jacks (The signal paths in both

Actually it is not necessary to install jacks. Where space is limited the cables can be wired directly
into the circuit. Plugs on the
connector
jumper used to com

DO NOT wire the cables directly into the circuit without providing strain relief of
terminals are not strong enough to withstand much pulling and repeated twisting of the cables
will break the conductors of the cable where they are soldered to the home music system circuitry.

Modern home music systems may be either vacuum tube or transistor types (or a combination of
both) and may use printed circuits as well as point-to-point wiring. Printed circuitry in the two
schematics in this section has been shaded. The transistor home music system uses much more
printed circuitry.

can

be used to connect the two plugs together to take the place of the horse-shoe shaped

plete the circuit with factory-installed

other

ends will go into the

Spacexpander

Spacexpander

jacks. A feed

lacks.

through

some

sort. Solder