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.
The standard CRT is the T55 with P31 phosphor. It has a post-deflection acceleration voltage of +2335V. The CRT cathode runs at -1675V. The HV power supply uses three 5642 rectifier tubes:
- V822 for the CRT cathode voltage
- V832 for the CRT control grid voltage
- V842 for the post-deflection voltage
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turret attenuator
