Maintenance; General Information - Tektronix 53C Instruction Manual

PARTS ORDERING AND REPLACEMENT
Instruction Manual
A Tektronix instruction manual usually con*
tains hand-made changes to diagrams and parts
lists, and sometimes text. These changes are
in general appropriate only to the instrument
the manual was prepared for. These hand-made
corrections show changes to the instrument
that have been made after the printing of the
manual.
There is a serial number on the frontispiece
and on the warranty page of this manual. This
is the serial number of your instrument. Be
sure the manual number matches the instrument
number when you order parts.
NOTE
Always include the instrument type
AND SERIAL NUMBER in any cor ­
respondence regarding the instrument.
Standard Components
Tektronix will supply replacement compo ­
nents at current net prices.
most of the components are standard electronic
and radio parts you can probably obtain them
locally faster than we can ship them to you
from the factory in Portland, Oregon. Be sure
to consult the instruction manual to see what
tolerances are required.
Selected Components
We specially select some of the components,
whose values must fall within prescribed limits,
by sorting through our regular stocks. The
components so selected will have standard
RETMA color coding showing the value and
tolerance of the stock they were selected from,
but they will not in general be replaceable from
dealer ' s stocks.
Checked Tubes
To obtain maximum reliability and perform ­
ance we check some of the vacuum tubes in our
instruments for such characteristics as micro ­
phonics, balance, transconductance, etc. We age
other tubes to stabilize their characteristics.
Since there are no well defined standards of
tube performance we have established our own
arbitrary standards and have developed equip ­
ment to do this checking. These checked tubes
can be purchased through our local Field Engi ­
neering Offices or directly from the factory in
Portland, Oregon.
Tektronix Manufactured Parts
Tektronix manufactures almost all of the me ­
chanical parts and some of the components used
in the instrument. If you ' order a mechanical

MAINTENANCE

part be sure to describe the part completely to
prevent any unnecessary delay in filling your
order. When you have any questions about me ­
chanical parts or Tektronix manufactured com ­
ponents contact our nearest Field Engineering
Office or write to the Field Engineering De ­
partment at the factory in Portland, Oregon.
to help identify the various circuits. These wires
will be either a solid color or will be a solid
color (including black and white) with one or
more colored stripes. The colored stripes are
" read " in the same manner as the RETM A
resistor color code.
stripes the wide stripe is read first.
ply voltages are white and the stripes indicate
the supply voltage. For example, the +225-V
supply bus will be coded red-red-brown (2-2-1)
giving two significant figures and the decimal
multiplier.
However, since
the stripes indicate the supply voltage. For ex ­
ample, our most common negative-supply volt-
tage is — 150v and is carried by a black wire
coded brown-green-brown (1-5-1).
former are yellow and coded brown-brown-
brown (1-1-1).
6-2, 6-3, etc., not to indicate that the voltages
are different but to differentiate between cir ­
cuits.
from instrument to instrument. In general all
signal-carrying leads are white and coded with
a single colored stripe. In a few places where
the number of leads exceeded the capabilities
of single-stripe coding we have used solid-color
leads.
this instrument must contain a small percentage
of silver.
solder will dissolve the fused bond of silver
that makes the solder adhere to the porcelain,
especially if the soldering iron is quite hot.
we use at the factory is attached to each major
instrument having ceramic strips. This solder,
containing approximately 3% silver, is not readi ­
ly available through regular channels. If you
need additional silver-bearing solder for main ­
tenance purposes you can purchase it from Tek ­
tronix in one-pound spools.
51/54C — MAINTENANCE — PAGE 1

GENERAL INFORMATION

Color Coding
We use color coded wires in the instruments
In the case of multiple
Wires carrying positive regulated-power-sup ­
The negative-supply bus wires are black and
The mains-voltage leads to the power trans ­
The tube heater leads are white and coded 6-1,
In other respects the color coding will vary
Soldering Precaution
The solder used on the ceramic terminals of
Repeated use of ordinary tin-lead
A quantity of the silver-bearing solder that