Telequipment D56: Difference between revisions
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Revision as of 07:17, 17 May 2024
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
- 35 tubes + CRT (same CRT as in the D55A).
- Vertical Amplifiers (each): 2×EF184, 2×ECC88, 2×E810F.
- Horizontal Amplifiers (each): V101: ECF80, V102 ECF80, V103: ECC88, V104: ECC88, V105: EAA91, V106: ECF80, V107: ECF80, V108: ECF80, V109: ECF80.
- Time Delay: V302: ECC88, V303: ECC88.
- Trace Blanking: V304: ECC88, V305: ECC88, V403: EF184.
- Regulators Board ? PC23: V301: ECC88.
- Regulators Board PC24: V401: EL86, V402: ECF80.
- CRT: 5" flat-face, double gun, P1 phosphor. 1374K G.E.C.
Transistors
- Nine germanium PNP transistors.
- Motorola LB293, T-119, TO-92, germanium, PNP: TR251, TR252, A; TR101, TR102, B; TR101, TR102. 6 pcs. total.
- Newmarket NKT452, TO-3, germanium, PNP, 3A. TR402.
- Newmarket ACY22, TO-5, Germanium, PNP. 225mW, TR401, TR403. 2 pcs.
Pictures
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D56 Front View
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D56 trace
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D56 Rear View
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D56 Vertical Amplifiers Side View
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D56 Vertical Amplifiers Side View
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Rear View with Transformers and Regulators
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D56 Regulators
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Timebase Side View
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Timebase A top
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Trace Blanking Board PC27
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Timing Delay Transistors
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Trigger? Board Transistors
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Neutralization Trimmer, do not change
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Vertical Amplifier Component Side
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Rear Board on Vertical Side
