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for both the vertical and horizontal deflection. | for both the vertical and horizontal deflection. | ||
It is the first of the [[560-series scopes]], which contain no amplifier stages, | It is the first of the [[560-series scopes]], which contain no amplifier stages, requiring the plug-ins to directly drive the CRT deflection plates. | ||
requiring the plug-ins to directly drive the CRT deflection plates. | While promoted by Tek as having the advantage of ''“not limited by additional circuitry between the plug-in and the deflection plates”'', | ||
While promoted by Tek as having the advantage of | this configuration has the significant disadvantage that gain or sweep need to be calibrated individually each time | ||
''“not limited by additional circuitry between the plug-in and the deflection plates”'', | a plug-in is swapped to even get crude accuracy, as the raw deflection factor of the CRT varies to a relatively large | ||
this configuration has the significant disadvantage that | degree between units, and the mainframe has no circuitry to normalize this difference. | ||
gain or sweep need to be calibrated individually each time | |||
a plug-in is swapped to even get crude accuracy, as the raw | |||
deflection factor of the CRT varies to a relatively large | |||
degree between units, and the mainframe has no circuitry to normalize | |||
this difference | |||
In scopes that have amplifiers in the mainframe, this step can be skipped, | In scopes that have amplifiers in the mainframe, this step can be skipped, as doing so only tunes the accuracy to a small amount of additional precision. | ||
as doing so only tunes the accuracy to a small amount of additional precision. | |||
It may be for this reason that Tektronix referred to the 560 series mainframes as “indicators” rather than oscilloscopes. | |||
The 560 was introduced along with the similar [[561]] in 1961. A rack model was never offered. | |||
The 560 was introduced along with the similar [[561]] in 1961. | |||
A rack model was never offered. | |||
Both of the mainframes use conventional 5” round CRTs with glass envelopes. | Both of the mainframes use conventional 5” round CRTs with glass envelopes. | ||
The 561 also supports the 70 series plug-ins which are not compatible with the 560. | The 561 also supports the 70 series plug-ins which are not compatible with the 560. | ||
Certain members of the 70 series vertical amplifiers give a system bandwidth of 4 MHz in the 561. | Certain members of the 70 series vertical amplifiers give a system bandwidth of 4 MHz in the 561. | ||
The later 2 and 3 series plug-ins | The later 2- and 3- series plug-ins cannot be used in the 560 or 561, as they consume more power. | ||
The 560 and 561 were short-lived. Both were replaced by the 561A, which offered | The 560 and 561 were short-lived. Both were replaced by the [[561A]], which offered | ||
several performance improvements, within less than a year. | several performance improvements, within less than a year. | ||
==Power Supply== | {{MissingSpecs}} | ||
The maximum system bandwidth of the 560 is 1 MHz. | |||
==Internals== | |||
The 560 uses a [[T5030]] CRT, referred to as a "T503P2" (P2 [[phosphor]]) in the manual. | |||
The CRT has -3,300V on the cathode and +175V on the [[aquadag]]. | |||
The only circuit in the 560 apart from the CRT circuits and power supply is a voltage/timing calibrator. | |||
===Power Supply=== | |||
The 560 has a power supply that is similar to the [[503]]'s power supply. | The 560 has a power supply that is similar to the [[503]]'s power supply. | ||
Mains power first passes through transformer T601, | Mains power first passes through transformer T601, | ||
which produces unregulated AC heater current and | which produces unregulated AC heater current and 170 V<sub>RMS</sub> for the second part of the power supply. | ||
The second part is a regulated Armstrong power oscillator operating at 25 kHz, using transformer T620 and a V620, a [[6DQ5]]. | The second part is a regulated Armstrong power oscillator operating at 25 kHz, using transformer T620 and a V620, a [[6DQ5]]. | ||
The secondary outputs of T620 are simply rectified and filtered, producing -12 | The secondary outputs of T620 are simply rectified and filtered, producing -12 V, +125 V, -100 V, and -3,400 V. | ||
and - | |||
All regulation is performed by controlling the screen grid voltage on V620, the power oscillator tube. | All regulation is performed by controlling the screen grid voltage on V620, the power oscillator tube. | ||
In principle, the design used in the 560, which resembles a modern SMPS supply, | In principle, the design used in the 560, which resembles a modern SMPS supply, like that in a [[7704]], can offer higher efficiency | ||
like that in a [[7704]], | and lower tube count compared to the power supply of the [[561]], which uses a traditional design more similar to a [[545]]. | ||
can offer higher efficiency and lower tube count compared | |||
to the power supply of the [[561]], which uses a traditional design more similar to a [[545]] | |||
The | The increased efficiency comes from the elimination of series regulator tubes, which typically operate with around 100 V across them. | ||
The tube count reduction comes from eliminating the pass tube and the error amplifier for each regulated voltage that the power supply produces. | |||
Additional efficiency is gained by the 560's power supply because it doesn't need to supply heater current to all of those tubes. | |||
The 560 provides a maximum total of 25 watts of DC power to the plug-ins, less than other 560-series mainframes. | |||
[[ | Plug-ins whose model number starts with a 3 (e.g., the [[3A6]]) are not electrically compatible with the 560 because their power draw | ||
exceeds what the 560 can provide. | |||
==Pictures== | ==Pictures== | ||
<gallery> | <gallery> | ||
Tek 560 front.jpg|560 with [[50|Type 50]] and [[51|Type 51]] plug-ins | |||
Tek 560 left internal.jpg | |||
Tek 560 right internal.jpg | |||
Tek 560 trace1.jpg | |||
Tek 560.jpg|Description in 1962 Catalog | |||
Tek 560 1.jpeg | |||
Tek 560 2.jpeg | |||
Tek 560 3.jpeg | |||
Tek 560 4.jpeg | |||
Tek 560 5.jpeg | |||
Tek 560 power oscillator.jpg | |||
Tek 560 ps.png|Power Supply Schematic | |||
</gallery> | </gallery> | ||
[[Category:560 series scopes]] | [[Category:560 series scopes]] |