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Old 8th May 2004, 03:35 AM   #11
diyAudio Member
Join Date: Apr 2004
Location: Monroe Township, NJ
whats sand and selenium??
Sand is tubehead talk for SS (Silicon).

Before Germanium and, later, Silicon based semiconductors came on stream, semiconductor rectifiers based on the metalloid Selenium were available. Selenium is in the same column of the Periodic Table as Oxygen and Sulfur. Selenium rectifiers look like a stack of square fins. Selenium rectifiers are accidents waiting to happen and MUST be replaced QUICKLY. It is only a question of when, not if, a Selenium rectifier will fail. When Selenium rectifiers fail, toxic vapor and dust is emitted. Other parts may be damaged too. You will probably have to allow for the smaller forward voltage drop modern Silicon diodes exhibit. The UF4007 is a good choice for fabricating Selenium rectifier replacements.
Eli D.
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