3A6
The Tektronix 3A6 is a dual-trace plug-in. Bandwidth is 10MHz. The 3A6 is a 3A1 with the addition of a 260ns delay line. The 3A1 and 3A6 are intended for the 561 and 564 oscilloscope mainframes or with the 129 power supply.
<gallery> Image:3A6_1.JPG|front view image:3A6_2.JPG|left view File:Tek 3a6 input schem.png|Input Amplifier and Switching Schematic File:Tek 3a6 output schem.png|Output Amplifier Schematic