Dual 1225 Service Manual

ition May 1974
Technical data
Current type
Line voltage
Drive Dual 1224
Drive Dual 1225
Power consumption
Current requirements
Dual 1224
Current requirements
Dual 1225
Platter
Platter speeds
Pitch control
Wow and flutter
Signal-to-noise ratio Dual 1224
Signal-to-noise ratio Dual 1225
Tonearm
Pick-up head
(cartridge holder)
Stylus pressure
Pick-up cartridge
Dimensions
Weight Dual 1224
Weight Dual 1225
Dual 1224
Dual 1225
Service Manual
AC 50 or 60 cycle, with appropriate motor pulleys
110/130 V and 220/240 V selector
Two-pole Dual single-phase asynchronous motor
Four-pole asynchronous motor
< 10 Watt
approx. 60 mA at 220 V 50Ocycle,
approx. 115 mA at 110 V 60 cycle
approx. 64 mA at 220 V 50 cycle,
approx. 115 mA at 110 V 60 cycle
1.45 kg, 270 mm @
33 1/3 and 45 rom, automatic tonearm setdown coupled to speed selector
Adjustment of approx. 1 semi-tone (6 %) at both platter speeds
<+ 0.15 % rated in accordance with DIN 45 507
Rumble signal-to-noise ratio > 55 dB
Rumble unweighted signal-to-noise ratio > 35dB in-accordance with DIN 45'500
Rumble signal-to-noise ratio > 56dB
Rumble unweighted signal-to-noise ratio > 37 dB in accordance with DIN 45 500
Torsionally-rigid tubular aluminium arm with vertical pivot mounting, horizontal self-adjusting
pivot mounting
Removable, suitable for acceptance of all (Dual 1224 all piezo electric) cartridges having 1/2”’
mounting and a deadweight of 2 — 10 grams (including mounting fixtures)
Continuously-adjustable from O — 8 p, reliable as from 1 p stylus pressure
See separate data sheet
329 x 274 mm (+ 2 mm tonearm overhang)
3.9 kg
4kg
Dual Gebriider Steidinger - 7742 St. Georgen!/Schwarzwald

Dual 1225 Specifications

General

Speeds	33 1/3, 45 RPM
Weight	5.5kg
Drive Type	Idler wheel
Platter	270 mm
Cartridge Mount	1/2 inch
Automatic Functions	Auto Return
Platter Material	Aluminum
Tonearm	Static Balanced
Dimensions	150 mm

Summary

Technical Data

Pick-up Connection Diagram

Motor and Drive

Pitch Control

Tonearm and Tonearm Suspension

Replacing the Complete Tonearm and Bearing Assembly

Procedure for replacing the entire tonearm and bearing assembly, involving disassembly and reassembly steps.

Replacement of Tonearm

Instructions for removing the tonearm from its bearing frame, involving unscrewing and detaching.

Tonearm Anti-skating Device

Tonearm Guide Mechanism

Tonearm Lift (Cue Control)

Mechanism for safely setting the tonearm down on the record at any desired point.

Start Cycle

Manual Start

Stop Switching

Muting Switch

Record Drop

Shut-off and Change Cycle

Shut-off Mechanism

Replacement parts

Exploded view, above chassis

Detailed visual representation of turntable components located above the main chassis.

Exploded view, below chassis

Lubrication

Lubrication points above chassis

Diagram illustrating specific points requiring lubrication on the upper part of the turntable.

Lubrication points below chassis

Diagram illustrating specific points requiring lubrication on the lower part of the turntable.