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a [[12AT7]] acting as a unity-gain buffer between the plug-in connector and the vertical amplifier. | a [[12AT7]] acting as a unity-gain buffer between the plug-in connector and the vertical amplifier. | ||
====Spoiler Switch==== | |||
The plug-in bay of the 547 has a "spoiler switch" that only enables the full bandwidth of the 547's | The plug-in bay of the 547 has a "spoiler switch" that only enables the full bandwidth of the 547's | ||
vertical signal path when certain relatively modern plug-ins are used, | vertical signal path when certain relatively modern plug-ins are used, | ||
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so they can be fully inserted without pressing the spoiler switch. | so they can be fully inserted without pressing the spoiler switch. | ||
====Delay Line==== | |||
There is a 170 nanosecond [[delay line]] between the first and second gain stages. | There is a 170 nanosecond [[delay line]] between the first and second gain stages. | ||