Coin Machine Review (& Pacific ...)

PERMO~S
cAdvice To .' ,
Coin Phonograph Operators
•
In view of the necessity for using existing records beyond their normal life and because some record manufac-
turers have found it necessary to utilize substitute materials which - greatly increase the wear of records and
needles. the following corrective measures comply with the well-established fact that record and needle wear is
proportional to the vertical needle pressure applied to the record and the compliance factor (relative stiffneBB) of
the pick-up.
Suggestions for
Extendi~~the-
Life of Needles and Records
( : "' PICK-UPS -
Magnetic Pick-ups. Examine the needle holder rubbe~ bushings and damping pads for stiffness. If they have become
old and dry, they should be replaced. The armature should also be carefully centered between the pole pieces . The
manufacturer should supply these p a rts or should service the pick-up at a nominal cost.
Crystal Pick-ups. Crystal pick-ups that have been in service for more than a year should be carefully examined
for needle compliance. In other words, when the needle is tightly secured in the holder, it should move freely a few
thousandths of an inch in either direction. Since crystal cartridges must be factory serviced, it is suggested that
defective or faulty pick-ups be returned to the manufacturer for repairs or replacement.
-
NEEDLE PRESSURE-
Manufacturers several years ago utilized needle pressures as high as four to five ounces, however, this pressure
ha s been reduced in more recent instruments. With the phonograph at rest, the needle pressure may be determined
by the use of a small spring-type postal scale hooked under the needle screw. In the event that the downward
pressure is over two and one-half ounces and assuming that the pick-up head is in gooJ condition and has proper
compliance, additional weight of sufficient value ca n be added to the present counter weight of the pick-up arm
to reduce the pressure. The weight should be adjusted to a point where the downward pressure is two to two
and one-half ounces. This reduction in needle pressure will greatly extend the life of both needle and record.
-CAUTION-
After an additional counter weight has been added to the pick-up arm, the tripping or cut-off mechanism should
be carefully observed during its operation to be sure the cut-off mechanism properly actuates. It may be necessary
to clean and otherwise free the tripping parts until they operate freely. The pick-up arm supporting bearings should
be cleaned and oiled so that the arm will move across the record freely.
- - NEEDLES-
In the event that excessively worn records or records made from more abrasive materials are u sed, it is s ugge s ted
that the Permo elliptical type needle be reversed at more frequent intervals than normal in order to more nearly
equalize excessive wear.
-
IMPORTANT - -
There has been no change whatsoever in the quality or quantity of the precious metal tip. other material or
workmanship in the manufacture of Permo Point Needles .
Therefore, under like conditions the same high standard satisfactory performance should be realized therefrom a s
in the past.
Any substitute of a more abrasive material in the manufacture of records will unavoidably shorten the life of any
needle and also the record. Therefore, if excessive wear to either the needles or records s hould be experienced,
corrective measures, s uch a s suggested above , should be employed.
REMEMBER - WORN RECORDS OR ABRASIVENESS OF RECORD MATERIALS
WILL DEFINITELY AFFECT NEEDLE LIFE
PERMO PRODU[TS [ORPORllTION
6415 RAVENSWOOD AVENUE
CHICAGO. ILLINOIS
Mention of THE COIN MACHINE REVIEW is your best introduction to our advertisers.
COIN
MACHINE
REVIEW
21
FOR
JUNE
J942