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The 555 is a [[dual-beam scopes|dual-beam CRT oscilloscope]] introduced by Tektronix in | The Tektronix Type 555 is a [[dual-beam scopes|dual-beam CRT oscilloscope]] introduced by Tektronix in | ||
[[introduced_in_1959|1959]] and made until the late 1960's, when it was replaced | [[introduced_in_1959|1959]] and made until the late 1960's, when it was replaced | ||
by the [[556]]. | by the [[556]]. |