Tektronix Type B Plug-In Instruction Manual page 11

Maintenance — Type B
Soldering Precautions
The solder used on the ceramic terminals o f this instru­
ment must contain a small percentage of silver. Repeated
use of ordinary tin-lead solder w ill dissolve the fused bond
of silver that makes the solder adhere to the porcelain,
especially if the soldering iron is quite hot.
A quantity of the silver-bearing holder that we use at
the factory is attached to each major instrument having
ceramic strips. This solder, containing approximately 3%
silver, is not readily available through regular channels. If
you need additional silver-bearing solder for maintenance
purposes you can purchase it from Tektronix in one-pound
spools.
TROUBLE-SHOOTING PROCEDURE
Troubleshooting of plug-in units is somewhat complicated
by the need to determine whether the trouble observed
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is in the plug-in unit or in the oscilloscope. Many troubles
can be quickly isolated by substituting another plug-in unit
and looking for the same indications. Among the troubles
which fall into this category are insufficient gain, inability
to position the trace, noise, unbalance, and severe wave­
form distortion. Minor waveform distortions such as might
be caused by high-frequency peaking coils or delay-line
trimmers can be isolated by this method only by substituting
another plug-in unit of equal or superior bandwidth and
checking for the same distortion.
Noise and unbalance problems can also be isolated by
connecting a jumper from pin 1 to pin 3 of the interconnect­
ing plug. If the trouble remains, it is probably not in the
plug-in unit.
Most troubles are caused
can frequently find them by finding the bad tube and re­
placing it with a good one. It is a good practice to inspect
components in the circuit with the bad tube for possible
overheating as a result of the tube failure. One way to
find bad tubes is to try replacing suspected tubes with
good ones.
by tube failures and you