Telequipment D56

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Telequipment D56
15 MHz 2-ch scope
Telequipment D56

Produced from (?) to (?)

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Telequipment D56 is a 15 MHz dual-channel dual beam oscilloscope produced in the late 1960s.

It uses a mix of tube and solid-state circuitry. In the absence of a D56 manual, the closest manual is that of the D55A, which is an all-tube scope from 1963.

Key Specifications

Bandwidth DC to 15 MHz (-3 dB)
Rise time 23 ns
Deflection 10 mV/div to 50 V/div, 1–2–5, and ×10 magnifier
Input Impedance 1 MΩ // 40 pF
Sweep Rate 500 ns/div to 5 s/div, 1–2–5, and ×10 magnifier
Features 10 MHz time calibrator (intensity modulated marker) on CH11 using Timebase A
Power 90 - 240 VAC, 50 Hz, ~275 VA
Dimensions 24 cm × 43 cm × 48 cm
Weight 26.7 kg (59 lb)

Internals

Differences between D56 and D55A

The main differences between D56 and D55A are the following:

  • Both have 15 MHz Bandwidth.
  • 10 mV/div compared to 100 mV/div Sensitivity.
  • Circuit boards are used more consistently apart from the vertical amplifiers.
  • Mixed transistors and tubes. Still many tubes, but adding transistors gives more possibilities.

Tubes

Transistors

  • Nine germanium PNP transistors.
  • Motorola T-119, TO-92, germanium, PNP: TR251, TR252, A; TR101, TR102, B; TR101, TR102. 6 pcs. total.
  • Newmarket 452, TO-3, germanium, PNP, 3A.
  • Newmarket ACY22, TO-5, Germanium, PNP. 225mW, 2 pcs.

Pictures

Components

Some Parts Used in the Telequipment D56

Part Part Number(s) Class Description Used in
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
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
6CW5 154-0202-00 Vacuum Tube (Pentode) power pentode 132 526 547 General Radio 1124 Telequipment D56
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
6EJ7 Vacuum Tube (Pentode) high-gain frame grid RF pentode 526 Telequipment D56 Telequipment S32A Telequipment TD51
7788 154-0420-00 Vacuum Tube (Pentode) long life, shock and vibration resistant pentode 529 RM529 581A 585A RM581 RM585 Telequipment D56