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

The LV power supply is typical of 1960's Tek scopes. It provides:

• +400V unregulated
• +300V regulated, using one triode of a 6080 as the output tube
• +100V regulated, using one triode of a 6080 as the output tube
• -150V regulated, using a 6AU5 tube as the output tube

The reference for the LV supply is a 5651 which produces a -87V reference, which controls the -150V supply. The -150V supply is used as the reference for the +100V and +300V supplies.

• Tektronix 516 Manual (DjVu)
• Tektronix 516 Manual (PDF)

• 
• 
• 
• 
• 

  turret attenuator

• 

  HV power supply schematic

• 

  LV power supply schematic

• 

  Vertical input amplifier schematic

• 

  Vertical output schematic

• 

  Trigger schematic

• 

  Timebase schematic

• 

  Horizontal amplifier schematic

• 

  Bottom, toward front

• 

  Bottom, toward rear

• 

  Attenuators and front-end

• 

  Right front, sweep rate switch

• 

  HV power supply

• 

  Right front

• 

  Left rear

• 

  Left top

• 

  CRT neck pins

• 

  Rear right, transformer, filter caps, fan

• 

  Right top

• 

  Rear