Tektronix 7A26 Quick Start Manual page 9

TEKTRONIX
MANUAL MODIFICATION INSERT
VERTICAL AMPLIFIER MICROCIRCUIT REPLACEMENT
for
7A26
Serial
Numbers
BOlOlOO
-
B139377
Installed
in
SN
Date
This modification
Insert
is
provided
to
supplement
the
manual
for
the
above
listed
product(s). The
Information given
in
this insert
supersedes
that
given
in
the
manual.
Copyright © 1984
by
Tektronix.
Inc.
,
Beaverton. Oregon.
Printed
in
the United States
of
America.
All
rights
reserved.
Contents
of this
insert
may
not be reproduced
in
any form
without the permission
of
the copyright owner.
GENERAL
INFORMATION
This
kit
provided
parts
and
instructions
to
replace one
of
the
vertical
amplifier
microcircuits.
For
instruments
in serial
number
range
B010100
to
B109999.
the emitter
compensation
networks
for
U1750
and
U2750
were
modified.
In
order
to
optimize the
lOOHz
to
lOOkHz square wave
response (low-frequency compensation),
several
components
may
have been
selected. For
Replacement
of
U1350. U1450
or
U1550. changes
in
the values
of
C1332. R1332. C1431.
R1431
or
Cl 436
may
have
been
required. Selection
of
C2332.
R2332. C2431
or
C2436 may
have been necessary
if
U2350. U2450
or
U2550 was
replaced.
In
some
cases,
removal
of
C2533 may
have been
beneficial.
040-0785-01
page
1