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* [[Media:070-0225-01.pdf|Tektronix 516 Manual (PDF, OCR, bad-OCR)]] | * [[Media:070-0225-01.pdf|Tektronix 516 Manual (PDF, OCR, bad-OCR)]] | ||
}} | }} | ||
The '''Tektronix Type 516''' is a monolithic 15 MHz dual-trace oscilloscope [[introduced in 1960]]. | The '''Tektronix Type 516''' is a monolithic 15 MHz dual-trace oscilloscope [[introduced in 1960]], essentially a dual trace version of the [[515]]. It contains no transistors. | ||
It contains no transistors. | |||
{{MissingSpecs}} | |||
The main difference between the 515 and 516 is the front end. | |||
==Internals== | |||
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. | There are also some differences in the vertical amplifier circuitry. | ||
The 515 uses a [[6AU6]] pentode at the front end. | The 515 uses a [[6AU6]] pentode at the front end. | ||
The 516 uses a [[6DJ8]] dual triode at the front end, | The 516 uses a [[6DJ8]] dual triode at the front end, and in many other places throughout the instrument. | ||
and in many other places throughout the instrument. | |||
In a 516, the [[delay line]] directly drives the | In a 516, the [[delay line]] directly drives the vertical deflection plates of the CRT. | ||
vertical deflection plates of the CRT. | |||
The standard CRT is the [[T55]] with P31 [[phosphor]]. | The standard CRT is the [[T55]] with P31 [[phosphor]]. | ||
It has a post-deflection acceleration voltage of + | It has a post-deflection acceleration voltage of +2,335 V. The CRT cathode runs at –1,675 V. | ||
The CRT cathode runs at | |||
The HV power supply uses three [[5642]] rectifier tubes: | The HV power supply uses three [[5642]] rectifier tubes: | ||
* V822 for the CRT cathode voltage | * V822 for the CRT cathode voltage | ||
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* V842 for the post-deflection voltage | * V842 for the post-deflection voltage | ||
The LV power supply is typical of 1960's Tek scopes. | The LV power supply is typical of 1960's Tek scopes. It provides: | ||
It provides: | |||
* +400 V unregulated | * +400 V unregulated | ||
* +300 V regulated, using one triode of a [[6080]] as the output tube | * +300 V regulated, using one triode of a [[6080]] as the output tube | ||
* +100 V regulated, using one triode of a 6080 as the output tube | * +100 V regulated, using one triode of a 6080 as the output tube | ||
* | * –150 V regulated, using a [[6AU5]] tube as the output tube | ||
The reference for the LV supply is a [[5651]] which produces a | The reference for the LV supply is a [[5651]] which produces a –87 V reference, which controls the –150 V supply. | ||
which controls the | The –150 V supply is used as the reference for the +100 V and +300 V supplies. | ||
the +100 V and +300 V supplies. | |||
The LV power supply uses the [[120-142]] power transformer. | The LV power supply uses the [[120-142]] power transformer. | ||
==Pictures== | ==Pictures== | ||
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Tek 516 rear3.jpg | Tek 516 rear3.jpg | ||
</gallery> | </gallery> | ||
===Internals=== | ===Internals=== | ||
<gallery> | <gallery> | ||
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Tek 516 bottom front2.jpg|Bottom, toward front | Tek 516 bottom front2.jpg|Bottom, toward front | ||
</gallery> | </gallery> | ||
=== | |||
===Schematics=== | |||
<gallery> | <gallery> | ||
516hvps.png|HV power supply schematic | 516hvps.png|HV power supply schematic | ||