Maintenance - Tektronix Type B Plug-In Instruction Manual

PARTS ORDERING AND REPLACEMENT
Instruction Manual
A Tektronix instruction manual usually contains hand­
made changes to diagrams and parts list, 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
A lw ays include the instrum ent typ e and SERIAL
NUMBER in any correspondence re g a rd in g the
instrum ent.
Standard Components
Tektronix w ill supply replacement components at current
net prices. However, since most of the components are
standard electronic and radio parts you can probably ob­
tain them locally faster than we can ship them to you from
the factory in Portland, Oregon.
instruction manual to see that tolerances are required.
Selected Components
W e specially select some of the components, whose values
must fall within prescribed limits, by sorting through our
regular stocks. The components so selected w ill have stand­
ard RETMA color coding showing the value and tolerance of
the stock they were selected from, but they w ill not in gen­
eral be replaceable from dealer's stocks.
Checked Tubes
To obtain maximum reliability
check some of the vacuum tubes in our instruments for such
characteristics as microphonics, balance, transconductance,
etc. W e age other tubes to stabilize their characteristics.
Since there are no well defined standards of tube perform­
ance we have established our own arbitary standards and
Be sure to consult the
and performance we
SECTION 4

MAINTENANCE

have developed equipment to do this checking.
checked tubes can be purchased through our local Field
Engineering Offices or directly from the factory in Portland,
Oregon.
Tektronix Manufactured Parts
Tektronix manufactures almost all of the mechanical parts
and some components used in the instrument. If you order a
mechanical part be sure to describe the part completely to
prevent any unnecessary delay in filling your order. When
you have any guestions about mechanical parts or Tektronix
manufactured components
Engineering Office or write to the Field Engineering De­
partment at the factory in Portland, Oregon.
GENERAL INFORMATION
Color Coding
W e use color-coded wires in the instruments to help
identify the various circuits.
solid color or w ill be a solid color (including black and
white) with one or more colored stripes. The colored stripes
are ''read1 ' in the same manner as the RETMA resistor color
code. In the case of multiple stripes the wide stripe is read
first.
Wires carrying positive regulated-power-supply voltages
are white and the stripes indicate the supply voltage. For
example, the supply bus w ill be coded red-red-
+ 2 2 5 - V
brown (2-2-1) giving two significant figures and the decimal
multiplier.
The negative-supply bus wires are black and the stripes
indicate the supply voltage. For example, our most common
negative-supply voltage is — 150v and is carried by a
black wire coded brown-green-brown (1-5-1).
The mains-voltage leads to the power transformer are
yellow and coded brown-brown-brown (1-1-1).
The tube heater leads are white and coded 6-1, 6-2, 6-3,
etc., not to indicate that the voltages are different but to
differentiate between circuits.
In other respects the color coding w ill vary from instru­
ment to instrument. In general all signal-carrying leads are
white and coded with a single colored stripe.
places where the number of leads exceeded the capabilities
of single-stripe coding we have used solid-color leads.
These
contact our nearest Field
These wires w ill be either a
In a few
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