Telequipment D56: Difference between revisions

Revision as of 19:37, 12 February 2024

Telequipment D56
15 MHz 2-ch scope Telequipment D56 Produced from (?) to (?) Manuals Manual needed D56 Description in 1968 Catalog (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.

Specifications

Frequency Range between DC and 15 MHz (-3 dB).
Vertical Sensitivity between 10 mV/div to 50 V/div in 1-2-5 steps and including a 10x multiplier switch.
Rise Time in the area of 23 ns or more.
Input Impedance 1 MΩ // 40 pF.
Sweep Rates between 500 ns/div to 5 s/div in 1-2-5 steps in calibrated mode with a 1-10 variable multiplier.
10 MHz time calibrator (intensity modulated marker) on ch 1 using Timebase A.
Mains 90 - 240 VAC, 50 Hz, ca 275 VA.
Dimensions 24 cm x 43 cm x 48 cm.
Weight 59 lbs.

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): 2xEF184, 2xECC88, 2xE810F.
Horizontal Amplifiers (each): V101: ECF80, V102 ECF80, V103: ECC88, V104: ECC88, V105: EB91, 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 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

D56 Front View
D56 trace
D56 Rear View
D56 Vertical Amplifiers Side View
D56 Vertical Amplifiers Side View
Rear View with Transformers and Regulators
D56 Regulators
Timebase Side View
Timebase A top
Trace Blanking Board PC27
Timing Delay Transistors
Trigger? Board Transistors
Neutralization Trimmer, do not change
Vertical Amplifier Component Side
Rear Board on Vertical Side

@@ Line 22: / Line 22: @@
 * Vertical Sensitivity between 10 mV/div to 50 V/div in 1-2-5 steps and including a 10x multiplier switch.
 * Rise Time in the area of 23 ns or more.
-* Input Impedance 1 Mohm // 40pF.
+* Input Impedance 1 MΩ // 40 pF.
 * Sweep Rates between 500 ns/div to 5 s/div in 1-2-5 steps in calibrated mode with a 1-10 variable multiplier.
 * 10 MHz time calibrator (intensity modulated marker) on ch 1 using Timebase A.