565

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Tektronix 565
10 MHz dual-beam scope
Tektronix RM 565

Produced from 1962 to 1974

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix Type 565 is a dual-beam scope that takes two 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.

Key Specifications

Bandwidth up to 10 MHz determined by vertical plug-ins
Sweep 1 μs/div to 5 s/Div, 1−2−5, ×10 magnifier, and variable
Sweep delay 10 μs to 50 seconds
Power 600 W max. including plug-ins
Calibrator 1 kHz square wave, 1 mV to 100 V in decade steps
CRT T5650, cathode at −3.9 kV, no post-deflection acceleration

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 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 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 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

Components

Some Parts Used in the 565

Part Part Number(s) Class Description Used in
0G3 154-0291-00 Gas Discharge Tube (Voltage regulator) 85 V voltage reference 132 506 547 560 561 561A 561S 564 565 567 661 TU-4 Z
120-289 120-289 Discrete component transformer 565
12AT7 154-0039-00 Vacuum Tube (Dual Triode) dual high-gain triode 161 180 310 310A 315 316 360 502 502A 511A 512 513 513D 514 514AD 514D 516 524 529 RM529 544 546 547 556 565 570 3A2 75 3A75 1M1 A B C G H K L ML M N K R S Z
1X2 154-0005-00 Vacuum Tube (Diode) high-voltage rectifier 420 507 565
6080 154-0056-00 154-0315-00 Vacuum Tube (Dual Triode) dual power triode 132 160 316 317 516 535 535A RM35A 541 541A 535 536 545 545A 545B 546 547 549 565 567 575 581 581A 585 585A
6AL5 154-016 154-0016-00 154-0038-00 Vacuum Tube (Dual Diode) high-perveance dual diode 163 181 190 1M1 310 310A 315 316 317 3B1 3B1S 3B2 3B3 3B5 502 502A 503 511 511A 512 516 517 517A 524 526 535 535A 545 545A 549 551 565 570 581 581A 585 585A C T Telequipment D56 Telequipment S52
6AN8 154-078 154-0078-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 310 310A 316 317 360 502 502A 516 517 517A 526 565 570 575 N
6AU6 154-0022-00 157-0073-00 157-0059-00 154-0284-00 Vacuum Tube (Pentode) RF pentode 107 160 181 190 60 2A60 72 3A72 3C66 310 310A 316 317 360 502 502A 506 511 511A 512 513 516 517 517A 524 526 529 RM529 531 531A 535 536 545 545A 546 547 549 555 561 561A 561S 564 565 567 570 575 581 581A 585 585A 80 C CA Q
6BC7 154-0232-00 Vacuum Tube (Diode) triple diode 503 504 565 67 2B67
6BJ7 154-0453-00 Vacuum Tube (Diode) triple diode 503 526 565
6BL8 154-0278-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 67 2B67 3B1 3B1S 3B2 3B3 3B4 503 504 506 516 549 561 561A 561S 564 565 567 Telequipment D52 Telequipment D56 Telequipment S31 Telequipment S32 Telequipment S32A Telequipment S51 Telequipment S52
6CW4 154-0323-00 Vacuum Tube (Triode) Nuvistor triode 1A7 3A8 3B2 3S76 6R1 565 S-311
6CZ5 154-0167-00 Vacuum Tube (Pentode) power pentode 317 502 506 526 555 561 561A 561S 564 565 567
6DJ8 154-0187-00 154-0305-00 Vacuum Tube (Dual Triode) dual triode 132 161 310A 316 317 502 502A 503 504 506 515 516 519 526 529 RM529 533 535 536 543 544 545 545A 545B 546 547 549 555 556 561A 561S 564 565 567 581 581A 585 585A 661 1A4 1S1 60 2A60 63 2A63 67 2B67 3A1 3A1S 3A2 3A3 3A6 3A7 72 3A72 75 3A75 4S2 51 3B1 3B1S 3B2 3B3 3B4 3M1 3S76 3T77 3T77A 9A1 9A2 1121 80 81 82 86 B O W Z Telequipment D56 Telequipment S32A Telequipment D52 S-311 Telequipment TD51 Telequipment S52 Telequipment S51 Telequipment Type A TU-4
7233 154-307 154-0307-00 Vacuum Tube (Triode) low-mu triode 132 506 561 561A 561S 564 565
RT5204 151-0058-00 Discrete component Silicon NPN transistor 565 RM565 Z 2A61 3B1 3B3 3S76 3T77
STD916 152-0098-00 Discrete component 10 mA, 90 pF tunnel diode 556 565 RM565 661
T5650 154-0357-00 154-0358-00 154-0359-00 154-0360-00 154-0368-00 154-0426-00 154-0439-00 154-0440-00 154-0441-00 154-0477-00 154-0477-01 154-0477-02 154-0477-03 CRT dual-beam CRT 565