Decca ffss brochure

Page 1

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that all instructions are fully comp§ied with. The guarantee does not
cover stylus wear nor does it cover damage caused by mis-handling.
Stylus replacement can only be carried out by Decca of England but
this ensures that when the stylus ir replaced the performance of the
cartridge is exactly that ofa new one. This performance is
guaranteed and the repaired cartridge is then covered by our
guarantee for a further year. When stylus replacement is required
1 either from injury or long use return the cartridge in the packaging
with which it was supplied. You wsll receive a factory re-manufactured

cartridge for only the cost of the replacement stylus.

Specification

Contact comedians Continued

Your pick- -up arm will most likely be supplied With four coloured leads. i
International standard colouring is as follows: -

red: right-hand connection

white: left-hand connection

blue and green: earth or ground connections
The 2 earth or ground leads should be connected together and
jouned to pin C ofthe pick-up head. (See figure 4) In the unlikely
event of hum resulting this can usually be eliminated by removing
either the blue or the green lead.

Decca flss

lliplital
artridge

Fig 4 Vertical Coil Fig 5
B W _ 5' London cartridge (Elliptical)
L/H Channel 3 Lateral COll f
D Output: SmV at 5cm/sec/
Earth or Ground C C l Frequency range: 20Hz - 20KHz
R/H Channel A Stylus radii: Elliptical diamond
A W Moior oxis o-oooo
Contact 0 Vertical Coil Mm ax" 0'0003

Vertical tracking angle: lS'
Compliance: Lateral: l5 x IO-6 cm/dyne
Vertical: 7.5 x IO6 cm/dyne

use your dealer , Channel balance: Sizfistlfdrgm each channel

Inductance: 60mH per channel
(cannot be used for play-back

correction)
DC resistance: 2,200 ohms per channel

Recommended inputimpedance: 50K ohms

Tip mass: Less than I milligram

Playing weight: I toZgrams
Recommended l.5 grams

Your London cartridge is capable {superlative results. If it's
performance is not up to this high tandard. check to see that your
cartridge is correctly aligned, that continuity through your high
fidelity system is established and that a single efficient earth is
provided. If in doubt consult your high fidelity dealer whom you will
find to be a mine of information and will no doubt be able to
diagnose the fault. Decca Special P"oduc:5 will of course be pleased
to assist you or your dealer shOuld any difficulties arise.

Decca and '55 are registered tra'. e marks

Decca Special Products to i/fla
Guarantee lfllflilfl nicci mm 716
SPECIM Queenstown Road 3
Decca ffss cartridges are guaranteed to be free from electrical and PRODUCE 222':er SW8

mechanical defects for one year from the date of purchase provided

Printed in England

SP Ltd

Page 2

Careofyourturlridge

Your London cartridge is the result of continual research by the
world's leading record and pick-up. manufacturer. It will give you
superb results and years of good service providing reasonable care

is taken with its installation and use. Although its construction is
fairly rugged. nevertheless a precision product deserves careful
installation and handling.

Mounling
Your cartridge is supplied with ai adaptor bracket having standard
5" centres designed to fit most heail shells. The bracket fixing holes

are tapped 68A and alternative length screws are supplied. Extra
length screws can be shortened to iuit various mountings.

Figure I shows how 68A and otherlscrews are used.

Figl $ W !_-i,
w l

Nylon screw easily cut to length

- 3: --
_. 3--

Connedion

Solder connections should be made to the tags supplied with the head
shells but soldering must not be tione while the tags are connected
to the bracket pins. To obtain l5" (racking angle the top of the
cartridge should be parallel to the record surface.

Figure 2 shows how the head fits to the bracket. i.e. the head slides on
and off the bracket.

Figl 3'

Bracket

Protection Cover

.-

brushed away with a soft camel hair brush from the rear towards the
front ofthe cartridge. When brushing hold the cartridge vertically as
shown in figure 3 so that dust and luff will not be pushed into the
magnetic gap or into the lateral coil.

* Playing weight

The specification of your London cartridge is that obtained with a
playing weight of LS grams, but playing weight is determined to some
extent by the quality of the pick-up arm and the amount of friction in
the bearings. While it is quite possible to use a playing weight of less
than |.S grams it is unnecessary and not recommended.

* Tobinsornoflebias

A pick-up cartridge has a natural tendency to skate" towards the
centre ofthe record but is restrained from doing so by the inside
groove wall. This tendency can cause uneven stylus wear and will
often affect the separation betwev n channels. Use ofa bias
compensator not only averts uneven stylus wear but can also improve
quality. To obtain the highest performance with your new pick-up
cartridge we therefore recommend that some form of bias
compensation be applied.

. Stylus «are

The diamond stylus in your cartridge is suitable for use with all types
of microgroove records whether stereo or mono. It is not. however,
suitable for use with 78 rpm records. The cartridge should
occasionally be taken off the arm and any accumulation offluff

Fig 3 §

Direction of brushing

\

Given reasonable consideration your stylus will have an extremely
long life but we recommend that ou make use of the services
available to you by sending the cajtridge back to Decca of England

for inspection each year (or everyother year dependent upon its use).
The stylus will be examined and tlle performance of the cartridge
checked. Pack the cartridge caref lly in the container supplied and
send it back to us for inspection henever you suspect damage or
wear.

. Contact tonnetiions

Your ffss cartridge is what is kno 'n as a "sum-and-difference
pick-up" so that various coils are nter-related as shown in figure 5.
Viewing the cartridge from the c ntact end. a small flat contact will be
observed sited adjacent to the ea th pin. This is the connection shown
in figure 4 as D and is a test point sed only in the manufacturing
processes. On no account should .ny 'conneCtion be made to it.

Figure 4, shows the internal circu t ofthe pick-up and a diagram of
the head sh0wing the three sprin contacts.

For a mono installation. left and ght-hand pin connections should
be parallelled.