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The Tektronix Type 127 is a power supply and preamplifier for two [[letter-series and 1-series plug-ins|letter-series or 1-series plug-ins]]. | The Tektronix Type 127 is a power supply and preamplifier for two [[letter-series and 1-series plug-ins|letter-series or 1-series plug-ins]]. The Type 127 was [[introduced in 1958]]. | ||
It is a rack-mount unit with a power supply that resembles the power supply of an early | It is a rack-mount unit with a power supply that resembles the power supply of an early | ||
[[500-series scopes|500-series oscilloscope]]: a 50/60Hz transformer, [[selenium rectifiers]], a single voltage reference tube controlling | [[500-series scopes|500-series oscilloscope]]: a 50/60Hz transformer, [[selenium rectifiers]], a single voltage reference tube controlling |