516
The Tektronix Type 516 is a monolithic 15MHz dual-trace oscilloscope introduced in 1960. It contains no transistors. The 516 is essentially a dual trace version of the 515. The main difference between the 515 and 516 is the front end. The 515 uses a conventional rotary switch for the input attenuator while the 516 uses turret attenuators. There are also some differences in the vertical amplifier circuitry. The 515 uses a 6AU6 pentode at the front end. The 516 uses a 6DJ8 dual triode at the front end, and in many other places throughout the instrument.
In a 516, the delay line directly drives the vertical deflection plates of the CRT.
