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GENERAL INSTRUCTIONS
The section of the manual beginning with this page is the CONSTRUCTION
section. All pages in this section have page numbers followed by "C" (lC,
2C, etc.). The INSTRUCTION section resumes on the pages following the
CONSTRUCTION section. Note thot the CONSTRUCTION section is located
centrally in the book and may be removed without desrupting the INSTRUC-
TION section that both precedes it ond follows it.
Care taken in the construction of this
instrument wi ll
reward the constructor
with many years of satisfactory service and greater confidence in his instrument
.
We urge you to not rush the construction, but to take all the time necessary
for proper assembly and wiring
.
Furthermore, we urge strongly that you follow the wire and parts layout shown
in the pictorial diagrams as closely as possible. Very often wires are placed
as shown for a good reason, and certainly the appearance of the completed
Instrument will be improved and the difficulty of finding a wiring error wi II be
reduced by the following the wire and ports layout shown.
UNPACKING THE KIT: Unpack the kit carefully and check each part against
the parts Iist Inc Iuding those parts that are mounted to the chassis. If you have
trouble identifying any parts refer to the pictorial diagrams or the color code
n
chart.
You will find that the value of a component will vary within the allowable
circuit tolerance. For example, the 4.7KO, ±10%resistor may measure any-
where between 4.2KO and 5.2KO. Tolerances on paper capacitors are sub-
stantially greater, and the tolerance for electrolytics is usually +100% and
-50%.
CONSTRUCTION HINTS: USE THE BEST GRADE OF ROSIN CORE SOLDER
ONLY, preferably one containing the new activated fluxes such as Kester
"Resin-Five", Ersin "Multicore" or similar types. UNDER NO CIRCUMSTAN-
CES USE ACID CORE SOLDER OR ACID FLUX since acid flux can cause se-
rious corrosion. Before soldering make a certain of a good mechanical con-
nection. Use a clean, freshly tinned soldering iron, no smaller than 100 watts,
and place the solder on the joint (not on the iron)so that the solder
Is
melted
by the heat from the joint itself.
Do not remove the soldering Iron until the
solder flows and check to see that the resul ting joint is smooth and shiny when
the solder has cooled.
There are two extremes to be avoided; too little heat
and too much heat. If too little heat Is supplied, the joint will appear pitted
and grey, Indicating a rosin joint which is unsatisfactory. On the other hand,
If
too much heat is appl ied to a joint, the parts connected to It may either
change value, loose their protective coating, or break down
.
If
you are sol-
dering close to a part, hold the lead between the part and the joi nt being sol-
dered with the tip of
0
pair of longnose pliers
.
The pliers will conduct the
heot away and prevent the component from being unduly overheated.
If
for
any reason it Is necessary to resolder a joint, be sure to use new solder.
It should also be noted that the leads on resistors, capacitors, and transformers
are often longer than required.
These leads should be trimmed to the proper
length when necessary
.
Do not cut any lead until you have determined the
required length when the lead is routed as shown in the diagrams.
BASIC TOOLS REQUIRED
:
These basic tools are required for the construction
of the amplifier.
1. Screwdriver - 3/16" to 1/4" blade
2. Screwdriver - 1/8" blade
3. Longnose pi iers - 5 or 6"
4. Diagonal cutters
5. Soldering iron (100 watts), or soldergun, or pencil iron (35 watts)
6. Gas pliers
7.
High quality rosin or equivalent synthetic flux core solder. Do..!!2! use
acid or paste flux under any circumstances.
A set of spintites and a wire stripper are also very useful supplementary tools.
PARTS IDENTIFICATION: Please note that very many of the parts for which
color coding is given maynotbe color coded, but have their values and ratings
printed. The letter K is a multiplier(X1000) and on resistors or capacitors in-
dicates that the printed numerical value must be multiplied by one thousand
to obtain the value in ohms or micro-micro farads respectively. Note also that
one microfarad (mf) is equal to one million; micro-microfarads (mmf). To aid
in rapid identificotion, keep in mind that 5%, 10%, and 20% resistors are
color coded whereas 1 % resistor have their values printed; also that molded
tubular capacitors mayor may not be color coded, whereas disc capacitors and
electrolytics will always have their values printed. Please note the following
relationships between the units used to express resistance or capacity.
1,000,000 ohms (0)
=
1000 kilohms (KO)
=
I megohm (MO)
1,000,000 micro-micro farads (mmf)
=
1 micro farads (mf)
CONSTRUCTION PROCEDURE: The complete step-by-step mounting and wir-
ing procedure follows. Tokeep thedrawingsuncrowded
,
unnecessary repetition
of mounting or wiring details may be omitted
.
Note: The abbreviation (!=)
means connect but do not solder (until other leads have been
connected).
The
abbreviation (S) means connect and solder.
Bend the ground lug tabs on the sockets toward the chassis to prevent acciden-
tal shorting to the socket pins.
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Troubleshooting
