524

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Tektronix 524AD
TV waveform monitoring scope
Tektronix 524AD

Produced from 1953 to (?)

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix 524AD is a monolithic oscilloscope introduced in 1953 for monitoring television waveforms, designed by Cliff Moulton.

In a 1972 interview, Charlie Rhodes recalled:

In 1953 Cliff Moulton re-designed the 514 for TV station needs. This became the 524, the first TV-oriented instrument. It looked like a market of 200 or so in those days, but wound up producing 10,000 of this model.

Interestingly, the 524 appears on page 31 of the 1966 RCA Test Equipment Catalog.

Key Specifications

Bandwidth DC to 10 MHz @ ≥150 mV/div; with preamp, 2 Hz to 10 MHz down to 15 mV/div
Rise time 40 ns
Deflection variable from 15 mV/div to 50 V/div
Input 1 MΩ // 45 pF; 10 MΩ // 15 pF with P510A ×10 probe
Sweep 100 ns/div to 10 ms/div, ×3 and ×10 magnifier
Time markers 1 μs, 100 ns, 50 ns, 318 ns, 1.59 μs (200 or 40 markers per TV line)
CRT 5ABP1 (P1 phosphor) standard, P7 and P11 optional; 4 kV total acceleration (−1.5 kV/+2.5 kV)
Power 500 W
Weight 27.7 kg / 61 lbs

It uses selenium rectifiers in the low-voltage power supply.

The 524AD has a 56°C/133°F thermal cutoff.

Links

Internals

The vertical signal path of the 524 is similar to that of the 514. They have similar front-ends and similar distributed vertical output amplifiers.

The vertical amplifier has a three-stage distributed amplifier section (6×6AG7).

The video trigger circuitry present in the 524 distinguish it from the 514. Just before the L-C delay line in the vertical signal path, there is a cathode follower, V15A, that serves as the trigger pickoff buffer. The resulting trigger signal goes to a video sync separator circuit. Here, the there is clamping and amplification and, most importantly, a non-retriggerable multivibrator. The multivibrator is triggered by the vertical sync of the NTSC waveform. After being triggered, it is not triggerable again for about about 25 ms, so it misses the vertical sync of the next interlaced field and instead triggers on the vertical sync of one following that. So it consistently shows the "even" field or the "odd" field. There is a switch that perturbs the multivibrator so it can be switched between even and odd fields. The video trigger circuit drives a conventional trigger circuit and sweep circuit similar to that of the 514.

The 524 uses a cylindrical style of ceramic terminal strip, which is less common than the straight style. The cylindrical style is also used in the Type C, Type CA, and 315.

Pictures

Early model

Components

Some Parts Used in the 524

Part Part Number(s) Class Description Used in
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 M N K R S Z
12AU7 154-041 154-0041-00 154-0287-00 Vacuum Tube (Dual Triode) dual medium-μ triode 104 104A 122 160 161 162 181 190 310 310A 316 317 3C66 502 502A 507 511A 512 516 517 517A 524 526 535 536 545 545A 545B 547 549 555 561 564 570 575 581 581A 585 585A C D E N Q Hickok 1825
12AX7 154-043 154-0043-00 Vacuum Tube (Dual Triode) dual triode 3C66 513 524 531 531A 535 536 545 545A 545B 546 547 549 555 570 581 581A 585 585A E Q Hickok 1825
12B4 154-044 154-0044-00 Vacuum Tube (Triode) power triode 126 310 310A 316 317 502 502A 524 526 541 541A 535 535A 545 545A 546 547 570 549 551 555 513 581 581A 585 585A
12BY7A 154-047 154-0047-00 Vacuum Tube (Pentode) miniature 6.5 W power pentode 106 163 524 531 533 535 536 541 543 535 545 545A 549 555 75 3A75 3B5
12BZ7 154-048 154-0048-00 Vacuum Tube (Dual Triode) dual triode 524 570
5642 154-0051-00 154-0079-00 Vacuum Tube (Diode) directly-heated high-voltage rectifier 310 310A 316 317 360 453 502 502A 503 504 506 513 515 516 524 529 RM529 533 533A 535 536 543 543A 543B 545 545A 545B 547 551 555 556 560 561 561A 561S 564 567 570 575 581 581A 585 585A 647 647A
5651 154-052 154-0052-00 154-0288-00 Gas Discharge Tube (Voltage regulator) 87 V voltage reference 128 160 310 310A 502 503 504 511A 512 516 517 524 526 531 531A 535 536 541 541A 543 543A 543B 545 545A 545B 570 549 581 581A 585 585A
5ABP 154-068 154-0068-00 154-0068-01 154-0068-03 154-069 154-0069-00 154-070 154-0070-00 154-0070-01 CRT 5" CRT with electrostatic deflection 511A 512 524
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
6AH6 154-0013-00 Vacuum Tube (Dual Triode) RF pentode 524
6AK5 154-0014-00 154-0206-00 154-0084-00 Vacuum Tube (Pentode) RF pentode B C CA G K L S Z 517 517A 524
6AL5 154-016 154-0016-00 154-0038-00 Vacuum Tube (Dual Diode) high-perveance dual diode 163 181 190 1M1 310 310A 315 316 317 3B1 3B1S 3B2 3B3 3B5 502 502A 503 511 511A 512 516 517 517A 524 526 535 535A 545 545A 549 551 565 570 581 581A 585 585A C T Telequipment D56 Telequipment S52
6AQ5 154-017 154-0017-00 Vacuum Tube (Pentode) beam pentode 310 310A 316 360 507 511A 512 517 517A 524 536 570 575
6AS5 154-0018-00 Vacuum Tube (Pentode) 5.5 W beam pentode 517 517A 524
6AS7 154-020 154-0020-00 Vacuum Tube (Pentode) dual power triode 160 506 511A 512 513 517 517A 524 561 561A 561S 564
6AU6 154-0022-00 157-0073-00 157-0059-00 154-0284-00 Vacuum Tube (Pentode) RF pentode 107 160 181 190 60 2A60 72 3A72 3C66 310 310A 316 317 360 502 502A 506 511 511A 512 513 516 517 517A 524 526 529 RM529 531 531A 535 536 545 545A 546 547 549 555 561 561A 561S 564 565 567 570 575 581 581A 585 585A 80 C CA Q
6BH6 154-0026-00 154-0285-00 Vacuum Tube (Pentode) pentode 130 162 310 310A 512 517 517A 524 Nelson-Ross PSA-011
6BQ7A 154-028 154-0028-00 157-0022-00 157-0003-00 Vacuum Tube (Dual Triode) dual triode 107 163 181 310 315 316 360 524 531 532 535 536 541 545 570 T
6BW4 154-0119-00 Vacuum Tube (Dual Diode) dual diode 126 502 502A 524 575
6CL6 154-031 154-0031-00 154-0286-00 Vacuum Tube (Pentode) 7.5 W power pentode 132 310 310A 316 317 515 524 525 531 535 535A 545 545A 545B 549 570 581 581A 585 585A 3A74
6U8 154-0033-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 130 160 163 310 315 316 524 535 545 T