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The Tektronix 556 is a [[dual-beam scopes|dual-beam scope]], the successor to the Tektronix [[555]].
The Tektronix 556 is a [[dual-beam scopes|dual-beam scope]], the successor to the Tektronix [[555]]. It uses [[letter-series and 1-series plug-ins]]. A rack-mount version, the RM556 also exists.
 
== Comparison with the 555 ==
It is a one-piece unit whereas the 555 has a the power supply in a separate box.
Triggering and sweep circuitry
is integrated into the 556 mainframe, as opposed to
the removable timing units in the 555.  The 556 takes
two [[letter-series and 1-series plug-ins|letter-series or 1-series vertical plug-ins]].
The bandwidth is 50MHz.  


== Dual-Beam Modes ==
== Dual-Beam Modes ==
The 556 is a true dual-beam scope and none of the signal paths is shared between the two beams.  Electrically speaking, the power supply and the calibrator are the only parts that are common to both beams.  Apart from the power supply, the 556 has almost complete left-right symmetry, corresponding to top and bottom beams.  Although the beams can be operated completely independently, the 556 provides many options for routing signals between the vertical plug-ins, triggers, sweeps, horizontal amplifiers, and vertical amplifiers.  For example, a common use for a dual-beam scope is to view two simultaneous single-shot events, both sweeps being triggered by one of the traces.  For this purpose, the 556 allows the output of one sweep generator to be routed to the horizontal amplifier of the other beam, so it drives both beams.  Many other more sophisticated modes are also available.
The 556 is a true dual-beam scope and none of the signal path is shared between the two beams.  Electrically speaking, the power supply and the calibrator are the only parts that are common to both beams.  The 556 has almost complete left-right symmetry, corresponding to upper and lower beams.  Although the beams can be operated completely independently, the 556 provides many options for routing signals between the vertical plug-ins, triggers, sweeps, horizontal and vertical amplifiers.  For example, a common use for a 556 is to view two simultaneous single-shot events, both sweeps being triggered by one of the traces.  For this purpose, the 556 allows the output of one sweep generator to be routed to the horizontal amplifier of the other beam, so it drives both beams.  Many other more sophisticated modes are also available.


== Triggering ==
== Triggering ==
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== Vertical Amplifiers ==
== Vertical Amplifiers ==
The vertical amplifier of the 556 is solid state except for the input cathode followers ([[12AT7]]) and and the  
The vertical amplifier of the 556 is solid state except for the input cathode followers ([[12AT7]]) and and the  
output stage ([[8608]]).
output stage ([[8608]]).


A rack-mount version, the RM556 also exists.   
== Comparison with the 555 ==
The 556 is a one-piece unit whereas the 555 has a the power supply in a separate box.
Triggering and sweep circuitry
is integrated into the 556 mainframe, as opposed to
the removable timing units in the 555The 556 takes
two [[letter-series and 1-series plug-ins|letter-series or 1-series vertical plug-ins]].
The bandwidth is 50MHz.


== Comparison with the 556 ==
== Comparison with the 565 ==
The 556 superficially resembles the [[565]],  
The 556 superficially resembles the [[565]],  
which is is also a dual-beam one-piece scope, but the 565 takes two
which is is also a dual-beam one-piece scope, but the 565 takes two
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