5642
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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
- RCA 5642 datasheet
- 5642 / DY70 @ radiomuseum.org
Pictures
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 |
| 543B | Tektronix | Oscilloscope | 543B | 30 MHz oscilloscope | 1964 |
| 545 | Tektronix | Oscilloscope | 545 | 30 (33) MHz oscilloscope | 1955 |
| 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 |