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5642 - TekWiki

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Apollo 5642 Vacuum Tube

The 5642  (European: DY70) (P/N 154-0051-00, 154-0079-00) is a directly-heated high-voltage rectifier vacuum tube. It has three flexible lead connections and is intended to be soldered into the circuit.

The European type DY70 is very similar (with lower heater current, 140 mA).

It is used in the CRT cathode and post-deflection acceleration supplies in many Tektronix scopes. In typical CRT circuits, the filament/cathode leads of each 5642 have their own secondary winding on the HV transformer, typically a single loop of wire with extra silicone tube insulation.

Key Specifications

Heater 1.25 V, 200 mA
Peak inverse voltage 10 kV
Peak plate current 5 mA
DC plate current 250 μA
Min. supply frequency 5 kHz
Forward voltage drop 40 V @ 4 mA

Links

Pictures

  • Three 5642s in a 516 HV supply

    Three 5642s in a 516 HV supply

  • 5642s in a 547 HV Supply

    5642s in a 547 HV Supply

  • 5642s in a 535/RM35A HV Supply

    5642s in a 535/RM35A HV Supply

Used in

Some instruments using part 5642

Instrument Manufacturer Class Model Description Introduced
310 Tektronix Oscilloscope 310A 4 MHz oscilloscope 1955
310A Tektronix Oscilloscope 310A 4 MHz oscilloscope 1959
316 Tektronix Oscilloscope 316 10 MHz 3" tube scope 1959
317 Tektronix Oscilloscope 317 10 MHz 3" tube scope 1959
360 Tektronix Oscilloscope 360 CRT Indicator Unit 1954
453 Tektronix Oscilloscope 453 50 MHz portable dual-trace scope 1965
502 Tektronix Oscilloscope 502 1 MHz dual beam differential scope 1958
502A Tektronix Oscilloscope 502A 1 MHz dual beam differential scope 1963
503 Tektronix Oscilloscope 503 450 kHz differential-input scope 1960
504 Tektronix Oscilloscope 504 450 kHz scope 1960
506 Tektronix Oscilloscope 506 20 MHz scope 1964
513 Tektronix Oscilloscope 513 18 MHz scope 1950
515 Tektronix Oscilloscope 515 15 MHz Tube scope 1955
516 Tektronix Oscilloscope 516 15 MHz dual-trace scope 1960
524 Tektronix Oscilloscope 524AD TV waveform monitoring scope 1953
529 Tektronix Audio/Video 529 TV Waveform Monitor 1965
533 Tektronix Oscilloscope 533 15 MHz oscilloscope 1958
535 Tektronix Oscilloscope 535 10 (15) MHz dual-timebase scope 1954
536 Tektronix Oscilloscope 536 11 MHz X–Y oscilloscope 1957
543 Tektronix Oscilloscope 543 30 MHz oscilloscope 1958
543A Tektronix Oscilloscope 543A 30 MHz oscilloscope (?)
543B Tektronix Oscilloscope 543B 30 MHz oscilloscope 1964
545 Tektronix Oscilloscope 545 30 (33) MHz oscilloscope 1955
545A Tektronix Oscilloscope 545A 30 (33) MHz oscilloscope 1959
545B Tektronix Oscilloscope 545B 30 (33) MHz oscilloscope 1964
547 Tektronix Oscilloscope 547 50 MHz oscilloscope 1964
551 Tektronix Oscilloscope 551 27 MHz scope 1958
555 Tektronix Oscilloscope 555 Dual beam 30 MHz scope 1959
556 Tektronix Oscilloscope 556 50 MHz dual beam scope 1966
560 Tektronix Oscilloscope 560 1 MHz scope 1961
561 Tektronix Oscilloscope 561 10(4) MHz "General Purpose Scope" 1961
561A Tektronix Oscilloscope 561A 10(4) MHz "General Purpose Scope" 1962
564 Tektronix Oscilloscope 564 Split-screen storage scope 1962
567 Tektronix Oscilloscope 567 Sampling scope 1962
570 Tektronix Curve Tracer 570 Curve tracer for tubes 1955
575 Tektronix Curve Tracer 575 Curve tracer for transistors 1957
581 Tektronix Oscilloscope 581 100 (95) MHz oscilloscope 1959
581A Tektronix Oscilloscope 581A 85 MHz oscilloscope 1963
585 Tektronix Oscilloscope 585 100 (95) MHz oscilloscope 1959
585A Tektronix Oscilloscope 585 85 MHz oscilloscope 1963
647 Tektronix Oscilloscope 647 50 MHz scope 1963
647A Tektronix Oscilloscope 647A 100 MHz scope 1967