Dual 1019 Service Manual

Page 1

Service

Manual
Dual 1019

Technical Data:

Current:

Line voltage:

Drive:

Power consumption:

Current requirements:

Turntable speeds:
Speed adjustment:
Turntable:

Wow and flutter:
Signal-to-noise:
Tonearm:

Pickup cartridge:
Weight of unit:
Dimensions and
mounting cutouts:

alternating. 50 or 60 cycle. Wlih appropriate motor pulleys

selector for 110, 150, or 220 volts (see schematic P A)

four-pole. Single-phase, induction motor

6 5 watts approxnnately

50 mA maleum at 220 V. 50 Cycle; 90 mA maxxmum at ll? V, 60 Cycle
78. 4S, 33MJ and 16-73 rpm,

adjustment range of 65}, at all four turntable speeds

non-magnetic, 7'34. lbs. balanced

i- 0.1 1/0

at 100 c 9.5: better than 50 db

balanced on all three axes. extremely low mas -,

m

and premsmn, friction-free suspension
(vertical and horizontal friction bearing fruition less than 005 gm)
tonearm wrll accept all cartridges w:th 3A" mounting and weighing from 1--16 gms

167.: lbs.. less packing

see installation .nstructic-ns

Page 2

Fig. 1

left channel
channel 2

Tonearm hook-up schematic

white

red

91_

<-_-'I|_

Elf-9 'L__:J|-

right channel
channel 1
z
_-j--/
i__L JI

- Tonearm audio lead

channel 1
red lead

channel 2
white lead

tonearm
junction board
with muting switch

spring contacts between
plug-in cartridge head
and tonearm

plug-in head viewed
from above front

stereo pickup
->

phonograph
record

-.->

channel 1
red

tone arm
Circuit

@2
.l. 2
to
32:32: <
I board L1
01
channel 2 K
white

01:;1

->

inner side of groove
left channel

white I

blue

outer Side of groove
right channel

a) with miniature 5-pin plug

.L

b) with phone plug

amplifier

c) with banana plugs

channel 1 red
channel 2 yellow
common black
ground green

Page 4

Fig. 2 Motor suspension and turntable drive

II

I'IIII

lllilillii

105

Motor and Drive

The turntable and change cycle are driven by a four-pole Adapting for operation at line frequenCIes of 50 or 60 cycle
induction motor (116) With an extremely low magnetic field IS accomplished by the use of replaceable motor pulleys (105).
and vibration-free dr'Ve- Motor pulley. 50 Cycle Part No. 31 N - U 20

Motor speed is constant for line variations of t 10% Motor Motor pulley, 60 cycle Part No. 31 N ' U 28

speed .5 dependent on, and proportional to. line frequency. The motor pulley is secured to the motor shaft by means

of a set screw. When changing pulleys, care must be taken

Fig. 3 Motor field connections,
voltage selector in 110 volt position

white power switch

*1» ,_ e
\\0 voltage selector

4
motor
for amplifier connection 110/
(line voltage) 220 V~