86

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Tektronix 86
Vertical amplifier
Type 86 front

Compatible with 580-series scopes

Produced from 1963 to 1972

Manuals


Manuals – Specifications – Links – Pictures

The Tektronix Type 86 is a single-input amplifier plug-in introduced in 1963 for 580-series scopes.

The P6008 voltage probe was designed for use with the Type 86.

Units with serial numbers before 1997 use a rotary input switch for the input coupling. Starting with serial number 1997, a lever switch is used.

Specifications

Input impedance 1 MΩ // 15 pF
Bandwidth 85 MHz at 100 mV/cm, 80 MHz at 10 mV/cm (in mainframe)
Rise time ×1 mode, 1.5 ns from 100 mV/Div to 20 V/Div; ×10 mode, 2.2 ns from 10 mV/Div to 2 V/Div
Deflection  ×1 mode, 100 mV/Div to 50 V/Div;  ×10 mode, 10 mV/Div to 5 V/Div; 1−2−5

Internals

The signal path in the Type 86 begins with a 7586 nuvistor as a cathode follower, feeding a differential transistor-based stage. In ×10 gain, this is followed by three more differential transistor gain stages. Finally, a distributed amplifier with three 6DJ8s drives the mainframe interface.

Like for the Type 82 plug-in, 585 non-A scopes with serial numbers before 2585 should have the back termination of the final distributed amplifier output modified to the later circuit (modification 040-275).

Prices

Year 1965 1969
Type 86 + P6008 $350 $385
2020 value $2,880 $2,710

Pictures


Some Parts used in the 86

Page Class Description Used in
6DJ8 Vacuum Tube (Double Triode) dual triode 132 502 502A 503 504 515 516 519 533 535 543 544 545 545A 545B 546 547 549 555 556 565 581 581A 585 585A 661 2A60 2A63 3A8 1121 1A4 67 81 82 86 3B1 3B4 O Telequipment S32A Telequipment D52 Telequipment S52 Telequipment S51 Telequipment Type A
7586 Vacuum Tube (Triode) Nuvistor triode 1A1 1A2 1A5 10A2 10A2A 11B1 11B2A M 321 321A 3A74 3T77 6R1A 3A1 3A3 3A5 3A6 3A8 3A74 3S76 3T77A 4S1 6R1 82 86