Tektronix 7D12 Operator's Instruction Manual page 36

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MANUAL CHANGE INFORMATION
At Tektronix, we continually strive to keep up with latest electronic developments
by adding circuit and component improvements to our instruments as soon as they
are developed and tested .
Sometimes, due to printing and shipping requirements, we can't get these
changes immediately into printed manuals. Hence, your manual may contain new
change information on following pages.
A single change may affect several sections. Since the change information sheets
are carried in the manual until all changes are permanently entered, some
duplication may occur. If no such change pages appear following this page, your
manual is correct as printed.
SERVICE NOTE
Because of the universal parts procurement problem, some electrical parts in your
instrument may be different from those described in the Replaceable Electrical Parts
List. The parts used will in no way alter or compromise the performance or reliability
of this instrument. They are installed when necessary to ensure prompt delivery to
the customer. Order replacement parts from the Replaceable Electrical Parts List.