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Ceramic strips: Difference between revisions
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This can be avoided by keeping the HV circuit clean, particularly the nodes after the rectifier(s). | This can be avoided by keeping the HV circuit clean, particularly the nodes after the rectifier(s). | ||
Tektronix warned that these strips should only be soldered with silver-bearing solder (3% | Tektronix warned that these strips should only be soldered with silver-bearing solder (3% Ag was recommended). | ||
From [[502]] manual [[Media:070-090.pdf|070-090]] (1959), page 5-2: | |||
<blockquote> | <blockquote> | ||
'''Soldering Precautions''' | |||
In the production of Tektronix instruments, a special silver-bearing solder is used to establish | |||
a bond to the ceramic terminal strips. This bond may be broken by repeated use of ordinary tin-lead | |||
solder, or by the application of too much heat. However, occasional use of ordinary solder will not | |||
break the bond if too much heat is not applied. | |||
It is advisable that you have a stock of solder containing about 3% silver if you frequently perform | |||
work on Tektronix instruments. This type of solder is used quite often in printed circuitry and | |||
should be readily available. It may also be purchased directly from Tektronix in one-pound rolls | |||
(order by part number 251-514). | |||
Because of the shape of the terminals on the ceramic terminal strips you may wish to use a | |||
wedge-shaped tip on your soldering iron. A tip such as this allows you to apply heat directly to | |||
the solder in the terminals thereby reducing the heat required to melt the solder. Since excessive | |||
heat can destroy the bond of the terminal to the ceramic material, it is important to use as little | |||
heat as possible. Also, the wedge-shaped tip is desirable from a convenience stand-point, since | |||
it is easier to work on the ceramic strips with this type of tip. | |||
</blockquote> | </blockquote> | ||
Early instruments often contained a small spool of suitable solder inside the cabinet. | Early instruments often contained a small spool of suitable solder inside the cabinet. | ||
Today, some solder types containing silver, e.g. Sn62Pb36Ag2, are still available. | Today, some suitable solder types containing silver, e.g. Sn62Pb36Ag2 (2% silver content, 179°C melting point), are still available. | ||
Competitors like [[Lavoie]] used less sensitive tin-plated steel inserts that can be soldered with ordinary solder. | Competitors like [[Lavoie]] used less sensitive tin-plated steel inserts that can be soldered with ordinary solder. | ||