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The Tektronix Type 565 is a dual-beam scope that takes two 2-series or 3-series vertical plug-ins.
{{Oscilloscope Sidebar
Two trigger and sweep modules are contained in the mainframe.  The 565 is similar to the [[556]], but with much
|manufacturer=Tektronix
less bandwidth and without tunnel diode triggering. A rackmount version, the RM565, was also produced.
|series=560-series scopes
The triggering signal passes through a [[6DJ8]]-based differential amplifier and then is discriminated by a  
|model=565
[[6DJ8]]-based Schmitt trigger. As is usual for 560-series scopes, the vertical deflection plates of the CRT
|summary=10 MHz dual-beam scope
are driven directly by the vertical plug-in. Aside from being dual-beam, the 565 is unusual among the  
|image=Rm 565 cal signal.jpg
other 560-series models in the fact that it has built-in trigger, sweep and horizontal amplifier circuits.
|caption=Tektronix RM 565
It is also unusual in that it employs a tunnel diode in the trace intensification circuit.  The tunnel diode
|introduced=1962
forms as a bistable multivibrator: kick it one way and it turns on and stays on, kick it the other way and
|discontinued=1974
it turns off and stays off.
|manuals=
* [[Media:070-269.pdf|Tektronix 565 Manual]]
* [[Media:Tek 565 preliminary 070-269.pdf|Tektronix 565 Preliminary Manual]]
* [[Media:Tek 565 irb.pdf|Tektronix 565 Instrument Reference Book]] (OCR)
* [[Media:Tek 565 fcp.pdf|Tektronix 564 Factory Calibration Procedure]]
}}
The '''Tektronix Type 565''' is a [[dual-beam scopes|dual-beam scope]] that takes two [[560-series plug-ins|560-series vertical plug-ins]].
It was [[introduced in 1962]].
The 1974 catalog was the last one that included the 565.
 
A rackmount version, the RM565, was also produced. Aside from being dual-beam, the 565 is unusual among the other [[560-series scopes]] in the fact that it (the mainframe) has built-in trigger, sweep, and horizontal amplifier circuits.
 
{{BeginSpecs}}
{{Spec|Bandwidth|up to 10 MHz  determined by vertical plug-ins}}
{{Spec|Sweep|1 μs/div to 5 s/Div, 1−2−5, ×10 magnifier, and variable }}
{{Spec|Sweep delay| 10 μs to 50 seconds}}
{{Spec|Power|600 W max. including plug-ins}}
{{Spec|Calibrator|1 kHz square wave, 1 mV to 100 V in decade steps}}
{{Spec|CRT| [[T5650]], cathode at −3.9 kV, no post-deflection acceleration}}
{{EndSpecs}}
 
==Circuits==
CRT acceleration voltage is produced by a transformer driving a single [[1X2]] rectifier tube.
 
===Vertical Signal Path===
As is usual for [[560-series scopes]], the vertical deflection plates of the CRT
are driven directly, differentially, by pins 17 and 21 of the vertical plug-in.
The left plug-in bay is for the lower beam and the right plug-in bay is for the upper beam.
 
A 0.7−3 pF trimmer capacitor is connected immediately behind each of the plug-in connectors, and allows
for the mainframe to be calibrated so that plug-ins can be interchanged without requiring the
high-frequency compensation of the system to be readjusted.
The capacitance seen by the plug-in driving the scope should be 14.3 pF for either beam. 
 
There is no trigger pickoff in the vertical signal path of the 565.  That function is performed by the plug-ins.
 
=== Trigger and Sweep ===
The 565 is the only 560-series mainframe that has built-in trigger, timebase, and horizontal amplifier circuitry.
In all other [[560-series scopes]], those functions are performed by the horizontal plug-in.
 
The triggering signal comes from pin 11 on the plug-ins, is amplified by a [[12AT7]]-based cathode follower, and sent to "TRIGGER" switches.  From there, the trigger signal is sent through a [[6DJ8]]-based differential amplifier, and then is discriminated by a [[6DJ8]]-based Schmitt trigger.
 
The 565 is also unusual in that it employs a [[tunnel diodes|tunnel diode]]
(D845, a [[TD4]], which is equivalent to the [[1N3718]]) in the trace intensification circuit.   
The tunnel diode forms a bistable multivibrator: kick it one way and it turns on and stays on,  
kick it the other way and it turns off and stays off.
The tunnel diode is DC-coupled to the base-emitter junction of Q843,
which is a 2N404 germanium PNP transistor.
Because the tunnel diode and transistor are DC-coupled, the transistor needs to be germanium.
This is one of the rare cases when a failed germanium transistor cannot be replaced with a silicon part.
Contrast this with the timebase A trigger of the [[585|585A]], which uses a tunnel diode AC-coupled to a transistor,
which makes the forward voltage of the transistor's base-emitter junction irrelevant.
 
=== Calibrator ===
 
The calibrator is an astable multivibrator formed by one half of a [[12AT7]] and a [[6AU6]].
The other half of the 12AT7 serves as the output cathode follower for the calibrator.
 
=== Auxiliary Power Jack ===
The 565 has an [[Amphenol 165 series connectors|Amphenol 165 series connector]] (J780) on the rear panel, which allows the 565 to provide power to external devices.
The pinout and specs are shown below.
 
== Comparison with the [[556]] ==
The 565 appears similar to the [[556]], but is different in many ways.
The 556 uses tunnel diodes for triggering, while the 565 uses tubes.
The 556 uses [[letter-series and 1-series plug-ins]] while the 565 uses 560-series plug-ins.
Moreover, the bandwidth of the 556 is specified as 50 MHz, while the bandwidth of the 565 is specified as 10 MHz.
Subjectively, the trace of the 565 is very sharp, sharper than the trace of the 556.
 
== Mechanical ==
Benchtop (565) and rackmount versions (RM565) were made.
The benchtop version has the following dimensions:
* Width: 17 inches
* Height: 13.5 inches
* Depth: 23.375 inches
* Weight: 67 pounds
 
The RM565 weighs 80 pounds.
 
==Pictures==
<gallery>
Rm565_1.jpg|Front from RM565
Rm565_2.jpg
IMG 1213.JPG| Open 565
Wellenkino 565.jpg
RM565_P7.jpg|RM565 with P7 CRT
Tek 565 block.png|Block Diagram
Tek 565 timebase a timing sw.png|Timebase 'A' Timing Switch
Tek 565 timebase a trig.png|Timebase 'A' Trigger
Tek 565 timebase a gen.png|Timebase 'A' Generator
Tek 565 delay pickoff.png|Delay Pickoff
Tek 565 timebase b trigger.png|Timebase 'B' Trigger
Tek 565 timebase b generator.png|Timebase 'B' Generator
Tek 565 timebase b timing sw.png|Timebase 'B' Timing Switch
Tek 565 horiz display switching.png|Horizontal Display Switching
Tek 565 lower horiz amp.png|Lower Horizontal Amp
Tek 565 crt circuit.png|CRT Circuit
Tek 565 plug-in connectors.png|Plug-in Connectors
Tek 565 heater and power supply.png|Heater Wiring and Power Supply
Tek 565 amplitude calibrator.png|Amplitude Calibrator
Rm 565 front bottom internal.jpg
Rm 565 bottom internal.jpg
Rm 565 cal signal.jpg
Tek565-crop.jpg
Tek rm565 gray1.jpg|Gray RM565
Tek rm565 gray2.jpg|Gray RM565
Tek rm565 gray3.jpg|Gray RM565
Tek rm565 gray4.jpg|Gray RM565
Tek rm565 gray5.jpg|Gray RM565
Tek rm565 gray6.jpg|Gray RM565
Tek rm565 gray7.jpg|Gray RM565
Tek rm565 gray8.jpg|Gray RM565
Tek rm565 gray9.jpg|Gray RM565
Tek 565 j780.jpg|J780 on rear panel
Tek 565 j780 specs.png|J780 Specs
Tek 565 j780 pinout.png|J780 Pinout
Tek rm565 top inside.jpg
Tek rm565 hvps.jpg
Tek rm565 hv rectifier.jpg
Tek rm565 intensifier circuit.jpg
Rm565 two trace2.jpg
Tek rm565 top internal.jpg|top internal
Tek rm565 right cover off.jpg|LV power supply tubes on the bottom, HV on the top, fan in the rear
Tek rm565 bottom internal.jpg|bottom internal
Tek rm565 rear.jpg|rear
</gallery>
 
==Components==
{{Parts|565}}
 
[[Category:560 series scopes]]
[[Category:Dual beam scopes]]
 
[[Category:Introduced in 1962]]
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