Scott LK 48 Assembly Manual

Page 2

Hermon Scott
AUDIO PIONEER

Harmon H. Scott received [3.5. and 51.5. degrees from
MJT. Inventor of the RC Oscillator, llC tuned circuits
and filters. the Dynamic Noise Suppressor and other
devices. he has many U. S. and foreign putrnts. His
technical leadership was recognized by election as FeL
low in the Institute of Radio Engineers. Acoustical
Society of America, and Audio Engineering Society.
and 'by numerous awards, including the [olts Medal.
He is the author of many technical papnrs and articles.

l

Important
Firsts . . .

BY H. H. SCOTT

First high fidelity AM-FM Stereo
tuner using wide range AM design.
First to successfully use wide-band
circuitry in high-fidelity FM tuners.
First to market The Stereo-Daptor) a
stereo control unit that prevents 0b-

solescence. First to provide center

channel ouput on Stereo amplifiers
for added realism in playback.

Page 11

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The biggest source of mishaps, next to poorly
soldered joints, is short circuits. A short circuit occurs
when two uninsulated wires that are not supposed to, ac-
cidentally touch each other. It can also happen when a
wire going towards one pin accidentally touches an-
other pin or the metal chassis nearby. The main body
of a resistor or a capacitor is fully insulated so it does
not matter if this part touches something. It is only the
bare wires on the ends that you have to watch for. As
the number of parts in the amplifier starts to increase,
you will realize how possible it is for short circuits to
occur.

Extra quantities of black insulation material (spa-
ghetti) have been supplied. Whenever you suspect
that a short circuit may occur (either to the chassis, to
FIGURE 7 another bare Wire, or to another pin), slide a small piece
of spaghetti over the bare wires in question. If you
position the parts exactly as shown in the pictorials, you
will not need to use spaghetti very frequently. How-
ever, it is better to be on the safe side if you have any
doubts.

Check off each step as soon as it is completed. Cross
03 each (S) as soon as the soldering required is done.
Connect your soldering iron now so that it will be ready.

MAIN
CHASSIS
(30mm
SURFACE)
.N menum m
FIGURE 8
Cl. CZ, C3 47' C4
(CONDENSOR CAN) -'
FIGURE 6
E] t . l
STAND-UP y
RESISTOR
(RWS-l)
E INTRODUCTORY NOTES
6 To obtain the really fine performance this amplifier
MAéHmE is capable of, all lead lengths from components (resistors
SCREW REAR PORTION ( '
(TO BE WSERTED or MAIN CHASSIS and capacrtors) must be as short as possrble. Follow the
THRU THE SMALLER l (TOP VIEW) diagrams closely. Keep all parts as close to the chassrs
Hogéssgfigalhrlmm I as possible. This refers to all components and insulated
wires. Bare wires, of course, should not touch the chas-
sis, unless instructions indicate otherwise.
I I

LOCK NUT

Page 12

h

Assembly Group BF -1

There is an envelope of wires supplied. Open this envelope and spread out the wires for the front near you.
Several of the controls (like PI) have two decks. Some of the pins are on the bottom deck and some on the top. To
avoid confusion, the word top or bottom will be inserted after the pin number to insure that you will connect to the
right pin. Remember, do not solder unless you see the solder instructions (in red).

|:| BP1~1,

BF 1-2.

BFl-S.

BFl-4.
BFl-S.
BFl-G.
BFl-7.
BFl-S.

BPl-9.

BI'l-lO.
BFl-ll.

BFl-lZ.

IZIIZIEI DECIDED CID

Connect a 4 yellow wire from Pin 3,881 (V ) to Pin 1 (bottom), PI.
Connect a 3% yellow/white wire from Pin 6, 851 (51, ) to Pin 5 (top), Pl.

Connect a 3 black wire to Pin 1, P2. Strip an extra V2 of insulation from the other end. Pass this
end through Pin 2* (bottom), P1, and conncct to Pin 6 (top), Pl.

Connect a ZC black wire from Pin 1, P2 (5:) to Pin 3, P2.

Connect a 3 V2 yellow/white wire from Pin 4, $82 to Pin 7 (top), P3.
Connect a 3/; orange/white wire from Pin 6, 58-2 (.N ) to Pin 6 (top), P3.
Connect a 7 3/4 yellow wire from Pin 1, SSZ to Pin 7 (top), P4.

Connect a 7 1/er orange wire from Pin 3, SSZ ( ) to Pin 6 (top), P4.

Connect one of the bare wires from the pilot light to Pin 2, DZM, connect the other one to ground
lug A DZM (5 ).

Connect a 5% orange/white wire from Pin 4, SS3 (51 ) to Pin 5, SVVZ.
Connect a 6 orange wire from Pin 1, SS3 (5. ) to Pin 11, SW2.

Connect a 4" black wire from Pin 3, SW1 to Pin 6, SW2.

*Wire fed throng/a a pin counts as two leads to the pin, not 0712.