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First spider done.

Posted 27th March 2010 at 06:40 PM by Bas Horneman
Updated 14th February 2011 at 06:51 PM by Bas Horneman

The Takman resistors have thick copper wires. This makes for wonderfully strong little spiders.

I've also used ceramic terminals strips for the first time and it makes for a nice strong construction.

And I did the ccs for the phase splitter a while ago.

[edit] I used silver solder. But found out that it is NOT necessary with these fakes. Fake or not it make for a great construction.

"TEKTRONIX CERAMIC STRIPS, HISTORY and GENERAL INFORMATION
Tektronix first developed and used ceramic strips in their oscilloscopes in 1952. During the manufacturing process, silver in liquid form is painted in and on the notches of the strips prior to the application of the final glaze and final firing. The silver is then firmly bonded to the ceramic and wires can be soldered directly to the ceramic.

Special silver-bearing solder should be used when soldering to ceramic strips so the silver bonded to the strip does not dissolve in the molten solder. The content of this special solder is 60% tin, 37% lead, and 3% silver. We sell spools of it with 3 feet of solder on them.

The earliest ceramic strips used a metal stud mounting system with standard 2-56 nuts and star washers. Since 2-56 nuts and lock washers are readily available, they are not included with the early style ceramic strips we sell here. If you need some, look in the Hardware Section of our Parts Shop.

Later versions of ceramic strips, beginning in 1959, used a nylon stud and sleeve mounting system. All of this type of strip offered here includes attached ˝” nylon studs. Nylon sleeves are sold separately. These strips are mounted by first drilling a hole in sheet metal with a #21 drill bit, inserting the desired height of nylon sleeve adapter in the hole, and then inserting the nylon stud, attached to the strip, into the sleeve adapter.

Under certain poor environmental conditions and with several hundred volts applied between adjacent notches, “silver migration” will occur leading to ceramic strip failure because of arcing between adjacent notches. The silver plating in the notches will “migrate” and form a bridge across the glazed ceramic between notches. Eventually, the bridge will break down and form a conducting path between the notches. The heat from the resulting arc will “fire” the silver into the ceramic causing a permanent short between notches. The short cannot be reliably cleared and the strip should be replaced. Migrating silver can be cleaned from a strip if it is done before it arcs."
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Posted in Building
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Comments

  1. Old Comment
    SY's Avatar
    Those are the Tektronix ceramic strips? Wonderful, they are. I assume you used silver-bearing solder?
    permalink
    Posted 28th March 2010 at 06:12 PM by SY SY is offline
  2. Old Comment
    Bas Horneman's Avatar
    They are Tektronic fakes unfortunately. From partsconnexion. But I did use silver bearing solder because I read somewhere that I should with these strips...
    permalink
    Posted 29th March 2010 at 04:00 PM by Bas Horneman Bas Horneman is offline
 
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