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The filament and CRT HV voltages are generated in the 555 indicator unit. | The filament and CRT HV voltages are generated in the 555 indicator unit. | ||
The Tektronix 555 takes two[[letter-series and 1-series plug-ins|letter-series or 1-series vertical plug-ins]] | The Tektronix 555 takes two [[letter-series and 1-series plug-ins|letter-series or 1-series vertical plug-ins]] | ||
== Type 21 and 22 Timebases == | == Type 21 and 22 Timebases == |