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 consumption	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 OD3 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

Part	Part Number(s)	Class	Description	Used in
0D3	154-003 • 154-0003-00	Gas Discharge Tube (Voltage regulator)	153 V voltage reference	511 • 511A • 513 • 514
12AT7	154-0039-00	Vacuum Tube (Dual Triode)	dual high-gain triode	161 • 180 • 310 • 310A • 315 • 316 • 360 • 502 • 502A • 511A • 512 • 513 • 513D • 514 • 514AD • 514D • 516 • 524 • 529 • RM529 • 544 • 546 • 547 • 556 • 565 • 570 • 3A2 • 75 • 3A75 • 1M1 • A • B • C • G • H • K • L • ML • M • N • K • R • S • Z • Keithley 610B
5CPA	154-0063-00	CRT	5" CRT with electrostatic deflection	512 • 514
5V4G	154-008 • 154-0008-00	Vacuum Tube (Dual Rectifier)	dual rectifier	104 • 104A • 160 • 511A • 514
6AG7	154-012 • 154-0012-00	Vacuum Tube (Pentode)	9 Watt power pentode	104 • 104A • 105 • 112 • 511 • 511A • 512 • 513 • 514 • 517 • 517A • 524
6DK6	154-0149-00 • 154-0367-00	Vacuum Tube (Pentode)	high-frequency miniature pentode	180 • 503 • 513 • 514 • 541 • 543 • 535 • 545 • 545A • 551 • 555

Some Parts Used in the 514A

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