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512: Difference between revisions
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Built-in true differential inputs are also seen in later scopes such as the [[502]], [[503]], and [[504]]. | Built-in true differential inputs are also seen in later scopes such as the [[502]], [[503]], and [[504]]. | ||
The vertical pr-amplifier stage consisting of stage 1 and 2 is mounted in a sub-frame directly beneath the Vertical Deflection Sensitivity switch. | The [[:File:Tek 512-Vertial-Preamp.jpeg | vertical pr-amplifier]] stage consisting of stage 1 and 2 is mounted in a sub-frame directly beneath the Vertical Deflection Sensitivity switch. | ||
This stage is switched out of the signal path for higher input signal levels. | This stage is switched out of the signal path for higher input signal levels. | ||
A cathode follower voltage regulator V11 - [[12AU7]] - is used to supply the reduced and regulated plate voltages to stage 1 and 2. Similarly another [[12AU7]] - V12 - is used for both screen and plate supply to stage 3 and 4. | A cathode follower voltage regulator V11 - [[12AU7]] - is used to supply the reduced and regulated plate voltages to stage 1 and 2. Similarly another [[12AU7]] - V12 - is used for both screen and plate supply to stage 3 and 4. | ||
Matched pairs of [[12AU6]] and [[5879]] are kept inside the instrument as spare. | [[:File:Tek_512-Matched-Pair-Spare.jpeg| Matched pairs]] of [[12AU6]] and [[5879]] are kept inside the instrument as spare. | ||
They are mounted in a bracket behind CRT base. | They are mounted in a bracket behind CRT base. | ||
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</blockquote> | </blockquote> | ||
===HV Power Supply === | === HV Power Supply === | ||
Tektronix 512 oscilloscopes with serial numbers 101 through 2146 | Tektronix 512 oscilloscopes with serial numbers 101 through 2146 | ||
have an unregulated HV power supply that uses a 2 kHz oscillation frequency. | have an unregulated HV power supply that uses a 2 kHz oscillation frequency. | ||
Starting at serial number 2147, the HV power supply runs at 70 kHz and | Starting at serial number 2147, the [[:File:Tek_512-HVPS.jpeg|HV power supply ]] runs at 70 kHz and | ||
has regulation in form that is typical of Tek scopes of the 1950s and 1960s − | has regulation in form that is typical of Tek scopes of the 1950s and 1960s − | ||
the CRT cathode voltage is divided, compared with the −150 V supply and | the CRT cathode voltage is divided, compared with the −150 V supply and | ||
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The signal passes through a transformer which has approximately 0 V<sub>DC</sub> | The signal passes through a transformer which has approximately 0 V<sub>DC</sub> | ||
on the primary side and approximately −1500 V<sub>DC</sub> on the secondary side for grid bias. | on the primary side and approximately −1500 V<sub>DC</sub> on the secondary side for grid bias. | ||
The signal from the secondary is demodulated using a [[6AL5]] diode detector(rectifier), recovering the blanking signal, | The signal from the secondary is demodulated using a [[6AL5]] [[:File:Tek 512-Blanking-Rectifier.jpeg | diode detector]] (rectifier), recovering the blanking signal, | ||
which controls the grid bias voltage on the CRT. The [[6AL5]] blanking detector and its filament is elevated to -1500V. | which controls the grid bias voltage on the CRT. The [[6AL5]] blanking detector and its filament is elevated to -1500V. | ||