The Tektronix Type 533 is a 15 MHz oscilloscope introduced in 1958 that uses letter-series and 1-series plug-ins.

Tektronix 533
15 MHz oscilloscope
Tektronix 533A front

Produced from 1958 to 1973

Manuals

It is similar to a 535, but without the second, delayed timebase. Instead, it has a range of horizontal magnifiers from ×2 to ×100.

There is also a rack-mount version, the RM33. Later 533A have BNC connectors. The standard CRT for the 533 and 533A is the T5330-2. The difference between the 533 and 533A is only the trigger mode.

Key Specifications

Bandwidth DC to 15 MHz (≤ 3 dB) with Type K plug-in
Rise time 0.024 μs
Line Voltage 108/115/122/216/230/244 VAC ±10%, selected via soldering wire on transformer, 50 Hz to 60 Hz
Thermal Protection Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level
Power Consumption 500 W with CA plug-in
Cooling AC Fan
Trigger Modes (533) AC/DC/AC Slow, and HF Sync
Trigger Modes (533A) AC/DC/AC LF Reject, and HF Sync
Anode Potential 10 kV
Screen Area 6 cm × 10 cm
Construction Aluminum alloy chassis. Anodized front panel
Weight 61.5 lbs / 27.8 kg

Internals

The vertical amplifier consists of a 12BY7 differential amplifier followed by a 6DJ8 cathode-follower, followed by a 6197 differential (common-cathode) output stage that drives the 200 ns L-C delay line, which drives the vertical deflection plates of the CRT.

Trigger pickoff is taken after the cathode follower stage in the vertical amplifier. There is a 6DJ8 differential trigger pickoff amplifier followed by half of a 6DJ8 a cathode follower, buffering the trigger signal.

The trigger circuit is a 6DJ8 trigger amplifier followed by a 6DJ8 Schmitt trigger. Triggering can be from the internal pickoff or from an external signal, or "line" trigger via a 6.3 V tap on the power transformer.

The 533 contains a 53 °C (128 °F) thermal cutoff. The high voltages for the CRT, +8,650 V and −1,350 V, are generated by a 60 kHz Hartley power oscillator and five 5642 high-voltage rectifier diode tubes.

Pictures

533

533A


Some Parts Used in the 533

Part Part Number(s) Class Description Used in
120-0140-00 120-0140-00 Discrete component power transformer 533 533A
120-037 120-037 Discrete component power transformer 531 533
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
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
6197 154-0146-00 Vacuum Tube (Pentode) 7.5 W power pentode 516 531 533 535 535A 547 556 75 3A75
6DJ8 154-0187-00 154-0305-00 Vacuum Tube (Dual Triode) dual triode 132 161 310A 316 317 502 502A 503 504 506 515 516 519 526 529 RM529 533 535 536 543 544 545 545A 545B 546 547 549 555 556 561A 561S 564 565 567 581 581A 585 585A 661 1A4 1S1 60 2A60 63 2A63 67 2B67 3A1 3A1S 3A2 3A3 3A6 3A7 72 3A72 75 3A75 4S2 51 3B1 3B1S 3B2 3B3 3B4 3M1 3S76 3T77 3T77A 9A1 9A2 1121 80 81 82 86 B O W Z Telequipment D56 Telequipment S32A Telequipment D52 S-311 Telequipment TD51 Telequipment S52 Telequipment S51 Telequipment Type A TU-4
T5330 154-0178-00 154-0165-00 154-0179-00 154-0180-00 154-0350-00 CRT 5" CRT RM31A RM33 RM33A RM35A 531A 533 533A 535A


Some Parts Used in the 533A

Part Part Number(s) Class Description Used in
120-0140-00 120-0140-00 Discrete component power transformer 533 533A
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
T5330 154-0178-00 154-0165-00 154-0179-00 154-0180-00 154-0350-00 CRT 5" CRT RM31A RM33 RM33A RM35A 531A 533 533A 535A