514

Manuals – Specifications – Links – Pictures

The Tektronix 514 is a monolithic general-purpose oscilloscope introduced in 1949 or 1950.

It was designed by Tektronix engineers Bob Davis and Dick Rhiger.

Using a three-section distributed amplifier, it provides frequency response from DC to 10 MHz. Prior to the 514, customers had to choose between an instrument with 5 Hz to 10 MHz bandwidth (the 511) or an instrument with DC–2 MHz response (the 512). The 514 provides DC response and 10 MHz bandwidth.

Throughout its production run, a 'D' variant was available (514D, with the 'D' being stamped in by hand on some models), which has a 24-section 250 ns lumped L-C delay line. There was also an 'A' version (514-A & 514-AD respectively), which appears to have been available in 1954. (There were also some models marked 'Series A', which may have been a predecessor to the 514A? How does the 514AD differ from the 514D?)

It has no thermal cutoff.

Key Specifications

Frequency response	DC to 10 MHz
Input impedance	1 MΩ // 30 pF
Vertical deflection	100 V/cm down to 300 mV/cm (DC) / 30 mV/cm (AC), 1–3–10 sequence
Weight	28.1 kg (62 pounds)
Power	375 W

Internals

The 514 uses a 5CPA CRT with a total accelerating voltage of 3 kV (−1.5 kV on the CRT cathode and +1.5 kV on the CRT anode). The standard phosphor for a 514 was P1. The deflection sensitivity of the CRT is approximately 27 V/cm vertical and 32 V/cm horizontal.

The power supply is regulated based on a −140 V reference produced by an 0D3 gas regulator tube. The +225 V supply uses three 5V4G rectifier tubes in parallel.

Links

• Paul's research on models, variants, and years available
• Tektronix Photo Manual 1952

Pictures

514

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  Front

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  514AD with B&K Curve Tracer

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  Distributed vertical amp

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  Delay line trimmer caps

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  Bottom view

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  Power Supply

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  Upper Deck, rear

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  Upper Deck, front

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  Lower Deck, front

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  Lower Deck, rear

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  Fan Motor

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  Line Socket

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  Vertical amp schematic

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  Vertical preamp, early

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  HV Power Supply, early

514AD

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Components

Some Parts Used in the 514

Some Parts Used in the 514D

Some Parts Used in the 514AD