Dual 521 Service Manual

Lubrication
All bearings and friction points
vvere
adequately lubricated in the
factory. The most 'important
bearings are of the oil-preservation
type, so no lubrication is
necessary
in the first tvvo years of normal use
of the
record player.
Use lubricants sparingly. Make sure
no lubricant spoils the belt and
pu I
ley surfaces, which would cause
slipping. Avoid finger contacts with
these surfaces for the same reason.
Unspecified
lubricants may be-
come chemically decomposed.
To
avoid resulting failures,
we re-
commend
application of the follo-
wing lubricants at
the points
identically numbered in Fig.
23
and 24:
A
Renotac no. 342
adhesive oil
BP
Super V
iscostatic
10
W/30
Shell Alvania
no. 2
lsoflex
PDP 40
AK
500 000
Silicone Oil
Molykote
Fig. 23
Fig. 24
Dual
Gebrüder
Steidinger
7742
St.Georgen/Schwarzwald
920
538-2 5.2/0878
Printed in
Germany by Dual

Dual 521 Specifications

General

Drive System	Belt drive
Speeds	33 1/3 and 45 RPM
Weight	5.5 kg
Anti-Skate	Yes
Stylus	Elliptical
Output	Depends on cartridge