Scott 200B Owners Manual

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Extracted text from Scott 200B Owners Manual (Ocr-read)

Page 1

OPERATING
MANUAL

Page 2

LOOK HOW EASY IT IS TO OPERATE

This simpliﬁed photo-guide shows how to use your new
ampliﬁer. A similar guide on the inside back cover shows how
to connect the ampliﬁer to the rest of your music system.
However, we strongly suggest that you read the complete

YOUR ZOOB/LK-BO, STEREO AMPLIFIER

instruction book thoroughly. Only then will you get the
utmost enjoyment and maximum performance from this
superb instrument.

INPUT

Phone-for phonograph rec-
ords

Tuner-for FM or AM tuner

TAPE

To listen to tape played on a
regular Tape Recorder. (see
page 10)

This switch can also be used
to monitor a recording when
used with a tape recorder with
separate playback and record
heads. (see page 15)

SCRATCH

To reduce high frequency
noises such as record surface
noise. (see page 15)

POWER
To turn the amplifier on or off.
Will also supply power to any
device connected to switched
AC outlet on the back. (see
page 10)

COMPENSATOR

In Loud. position introduces a
circuit that boosts the extreme
high notes and low notes for
listening at low levels. and is
out of operation automatically
at loud levels. Vol." position
removes circuit completely.

(see page 13)

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SELECTOR /

For all stereophonic program
material, set to Stereo position.

Other positions are for mono-

phonic material, or for balanc-
ing the system. (see page 13
and 12)

TREBLE /

Modifies high frequency
sounds. Set to suit your taste.
(see page 14)

BASS

Modifies low frequency sounds.

Set to suit your taste. (see page
14)

PILOT LIGHT
Lights up a few seconds after
the unit has been turned on.

PHONES
To connect a set of low imped-
ance stereo headphones. (see
page 5)

BASS\

Modifies low frequency sounds.
153 to suit your taste. (see page

TREBLE
Modifies

high
sounds. Set to suit your taste.
(see page 14)

LK-30 uses different panel but has same controls as 2008 pictured above.

frequency

LOUDNESS\

Makes system louder or softer
to suit your taste. (see page 13)

Page 6

To A Single Speaker System

If you only own one speaker system and plan to add a second
speaker for stereo at a later date treat the single speaker as a left
channel speaker and operate the ampliﬁer with the Selector
in the Bal L. position at all times. It is not safe to operate con-
ventional ampliﬁers without a speaker load. However. all Scott
ampliﬁers are completely stable with resistive, capacitative, induc-
tive, or no load. You need never fear injury to your ampliﬁer by
using it with no load on the right channel. Do not attempt to
parallel the outputs of the ampliﬁer. Such a procedure may reduce
the power output and increase the distortion.

To a Center Channel Speaker or Monophonic
Extension Speakers

One of the many exclusive stereo features pioneered by H. H.
Scott is the derived third (or center) channel. This extra output is
used in conjunction with an auxiliary ampliﬁer to fulﬁl] several
important needs: 1. It gives fuller sound, particularly in large rooms
where it is necessary to separate speakers by more than eight feet.
2. It allows ideal seating for full stereo in a much greater portion
of your listening room giving you greater freedom in placement of
speakers and furniture. 3. It lets you feed a full monophonic signal
to single extension speaker systems in other rooms like kitchen,
den, porch, bedroom or bath. With an ordinary two channel system
you feed just half the signal to an extension speaker.

Derived Center Channel Preamp Output Jack

Connect a shielded audio cable from the Derived Center Channel
Output jack (labeled Der. Ctr. Ch.) on the back of your Scott am-

pliﬁer to the input of a separate power ampliﬁer. Use the 1.5 volt
input if it is an H. H. Scott power ampliﬁer and a high level input
(such as tuner, extra, etc.) on any
complete ampliﬁer. Set the level

n D control so that the center channel
0 C loudspeakers sound is lower in vol-
CH ume as compared with the left and

right stereophonic speakers. If the

center channel is driving extension
speakers, the separate loudspeakers can be equalized by using indi-
vidual T pads on each speaker. A T pad is a specially designed
level control that is readily available from your dealer.

The center channel output is controlled by all the front panel
controls, therefore, the auxiliary ampliﬁer should have a volume or
level control to be able to obtain the proper balance. It is essential
that the center channel speaker be in phase with the right and left
channel speakers for proper operation. See section on phasing found
later in the manual.

Powered Center Channel Output
(222, 29.9, LK-48, LK-72 series)

In addition to the derived center channel output described
above, these ampliﬁers also provide a powered center channel output
capable of directly driving center channel or extension speakers.
Connect one end of the speaker wire to the two terminals on the back
of the speaker system. Connect the other end to the O and H
terminals under Center Channel (on the same strip that you con-

Page 9

When using a ceramic or crystal cartridge, the inputs marked
Ceramic on the rear of the ampliﬁer should he used. The lead carry-
ing the left channel information
should be connected to the Left
LEFT Channel Ceramic input; the lead
A carrying the right channel informa-
cmwc tion should be connected to the
"5 Right Channel Ceramic input.
(2220, 200, LK-72, LK-48)
n RIGHT Either the ceramic or magnetic
high and low inputs may be used;
not all three at the same time. In
other words, if you are using a ceramic cartridge connected to the
Ceramic inputs, neither Magnetic High or Magnetic Low may be
used.
(299D) Mag 1 high or Low should not be used if you are using
0, Ceramic cartridge. The Pickup switch on the front panel must be
in 1 position. Mag 2, High or Low, can, of course, be used for
any other low level device.

Monophonic Record Player

The instructions outlined above for your ampliﬁer are equally
valid here. The only difference is that there will be only one lead to
connect and this should be inserted in the Left input. To play the
monophonic record so it is heard over both loudspeakers, turn the
Selector switch to L. Input.

Stereo Tape Deck

(222, 299, LK-48, LK-72 series) A tape deck is a machine with-
out playback preampliﬁers. The signal is fed directly from the tape
heads without any additional ampliﬁcation. A very small electrical

signal is produced similar to that obtained from a magnetic phono-
graph cartridge. With your Scott ampliﬁer you can connect both a
tape deck and a record player, and select either from the front panel.

222, LK-48, LK-72 series - Connect the leads to the Tape Head
input on the back panel. To listen

LEFT to tape, move the Equalization

switch to the NAB Tape position.

This will switch the input from

WE phone to tape head. The Input
3 must be in the Phone position in
order to listen to either the tape

6,. head or record player.
299 series - Connect the leads

to either Mag 1 low or Mag 2 low.
If your magnetic cartridge is connected to either Mag 1 high or low,
then use Mag 2 low. The Pickup switch in the front panel will
permit you to choose between the record player and the tape deck.
In addition, set the Input selector to NAB tape to get the proper
sound. More about this in the section on Equalization.

Microphone

(2.99 series) - A microphone can be connected in much the same
way as a tape deck or a magnetic cartridge. Use either Mag 1 or 2
high or low.* The Pickup switch on the front will permit you to
choose between the microphone and some other low level source. When
using the microphone, turn the Input selector to the Mic position.
This will assure the proper balance of sound. For more information,
see the section on Equalization.
* You cannot use Mag 1 high and low, or Mag 2 high and low at the
same time.

Page 13

200 and LK-30-The Input
selector switch chooses between
phono and tuner. (Any high level
signal such as TV sound can be
used in the Tuner input if desired.)

222, LK-48, LK-72 series-
INPUT The three position rotary switch
TUNER offers a choice of phonograph,
MONO I EXTRA tuner, or extra.

INPUT

TUNER PHONO. I

29.9 series - Starting with the
control in the extreme counter-
clockwise position, the ﬁrst three
positions automatically select the
low level inputs on the back of the
ampliﬁer. To choose between Mag
1 (high or low) or Mag 2 (high
or low) use the Pickup switch on
the front panel. While all three
positions of the Input selector
choose the same inputs, they do
affect the signal in different ways.
This will be explained in greater
detail in the section on Equaliza-
tion. However, you use the Mic
position for a microphone, NAB
tape when listening to a tape deck,
and RIAA when using a record
player. The next position is for
tuner, and the last is to select any high level source (TV, Crystal
Microphone) that might be connected to the Extra input.

INPUT

RIAA PHONO

TUNER
/_

- EXTRA

NAB TAPE

MIC -\

Equalization

In the process of making a disc or tape recording, the engineers
have found it expedient to deliberately reduce the low frequencies
and boost the high frequencies. This makes it possible to get more
music on the record and reduce annoying background hiss and
surface noise. To return the overall frequency reSponse to normal
(ﬂat), your ampliﬁer must incorporate a corresponding amount of
bass boost and treble cut. This process is referred to as equalization.

To perform its function properly the equalization curve used
in the ampliﬁer must correspond exactly to the one used in making
the recording. Since 1956, all phonograph records have been made
with what is known as the RIAA equalization curve. All Scott
ampliﬁers made since 1951 incorporate this equalization curve. If
you have a few older records which may have been made using
slightly different curves, small adjustments of the tone controls can
easily correct for proper response.

(200 and LK-30 397ies)~-The RIAA curve is built into your
ampliﬁer and automatically takes effect whenever you operate the
system in the phono position.

222, LK-48, LK-72 series-When you put the Equalization switch
on the front panel in the RIAA
phono position, it will automat-

EQUALIZATION ically switch the record player into
NAB RIAA I the clircuit with the proper RIAA
TAPE pHONO equa lzatlon.

In addition to this feature,

your ampliﬁer provides an addi-
tional equalization curve specially
designed for playback of pre-recorded tape from a tape deck. A tape
deck does not include playback preampliﬁers and signal is fed di-
rectly from the tape head to the ampliﬁer without additional ampli-