Gates Radio Company CB-11 User manual

I. B. 1302
12/15/53
INSTRUCTIONS
MODEL C B -11 AND CB-21
TURNTABLES
GATES RADIO COMPANY
MANUFACTURING ENGINEERS SINCE 1922
OUNCY, ILL., U. S. A.

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4

GENERAL INSTRUCTIONS FOR CB-1l AND CB-21
TRANSCRIPTION TURNTABLE CHASSIS MECHANICAL OPERATION
CB-11 33-1/3 RPM/7$ RPM (45 RPM with Adapter)
CB-21 33 -1/3 RPM/45 RPM
The Gates CB-11 and CB-21 Transcription Turntables are of the inside
rim drive design, recognized by most engineers as the most success-
ful type of turntable for quietness in operation and freedom from
mechanical difficulties. The equipment has been designed to require
a minimum of maintenance, and actual maintenance requires only
periodical cleaning and a single oiling detail, bi-monthly, pertain-
ing to the motor.
IDLER WHEELS
Two idler wheels are provided, both being identical and carrying
Gates Part No. A -1939-103. These idler wheels are inverted in
relation to each other, and thus are located for proper engagement
with the two pitch diameters of the motor drive shaft, which governs
the speed of the rotation of these idler wheels. The idler wheel
that engages with the large diameter of the motor shaft is the one
for 7$ RPM on the CB-11 and-for 45 RPM on the CB-21 and the other,
which engages with the small diameter, is for 33-1/3 RPM. These
idler wheels are arranged on a specially designed bracket arrange-
ment which, by means of the speed change lever, moves the idler
wheel for the desired speed into the proper position for engagement
with the inside rim of the turntable. These idler wheels and their
location have been carefully adjusted at the factory before shipment
and no readjustment should be required unless the equipment becomes
loosened in transit. If loosened, it will be noted that the bracket
previously referred to, which holds the two idler wheels, is bolted
to the main casting by means of a single bolt which is located in
an oversize hole so that the idler wheels may be adjusted for uni-
form tension at both speeds. As adjustment is seldom, if ever,
required, it is suggested that if in an extreme case this would be
necessary, such as damage in shipment, or after long ,ariods of
operation, follow instructions on Page 3.
MOTOR
The motor is a specially designed vertical type synchronous motor
carefully balanced for both low mechanical and audible noise. As
it is a synchronous type motor, it will operate at the same speed,
regardless of line voltage, between 90 and 140 volts. However, it
is recommended that both the correct voltage and frequency be used,
as synchronous motors, by their very nature, have a greater tempera-
ture rise when operating at voltages other than normal.
TURNTABLE CASTING
The casting is a specially designed aluminum casting with each rib
and location of mass carefully determined to cancel harmonic vibra-
tions and thus eliminate rumble. On all Gates turntables a small
cushion strip is placed between the casting and the table proper.
Where the chassis only is purchased, for use in other than Gates
cabinets, this strip is also supplied. When the mounting screws are
finally pulled up to hold the chassis to the table, they should be
pulled up only firmly enough to secure it, allowing the mounting
strip to absorb any floor vibration.

OILING
The CB-11 and CB-21 chassis are equipped with Chrysler oilite
bearings in the main center spindle and on each idler wheel bearing.
Thus, little, if any, oiling is required at this point, although in
some instances where the equipment is new and tight, oiling -may be
required for a period of three or four weeks. Remove the idler
wheels and the platter. Clean both the inside of the spindle bear-
ing with a soft rag, and the inside of the idler wheel bearings and
the outside of the spindle bearings. Place about a teaspoonful of
fine-oil or lathe spindle oil in the center spindle bearing and a
few drops in each of the idler wheel bearings and reassemble the
equipment. Caution should betaken that oil is not conducted to the
inside rim of the turntable as this will cause slippage. This, of
course, is corrected by making sure there is no oil on the top of
each idler wheel bearing. As a precaution, wipe them off with a
soft rag. After operating the turntable a minute or two immediately
foll6wing the oiling procedure, remove the turntable platter and
note if there is any oil on the inside rim. If there is, it should
be wiped off, and likewise the idler wheels should then be wiped
clean because if there is oil on the inside rim of the platter,
there will be oil on the outside of the idler wheels.
MODE OF OPERATION
The turntable is simple in its design, and the operator will imme-
diately recognize, by casual inspection, the mode of operation.
When the speed shift lever is in the center position, the motor is
turned off and the idler wheels are disengaged from the platter.
When the lever is turned to right or left, the turntable is operat-
ing at the speed pointed to on the escutcheon plate, either 7$ RPM
and 33-1/3 RPM on the CB -11, or 45 RPM and 33 -1/3 RPM on the CB-21.
The microswitch which turns on the motor at time of engaging the
speed lever is provided so that the operator will not possibly let
the motor come up to speed before engaging the idler wheels to the
turntable. Though in emergencies, such as the operator starting the
turntable at the wrong speed, it can be quickly changed to the other
speed by reversing the speed lever position. This practice is not
recommended, as it creates extra pressure on the driver wheels and
morely adds to their wear, which under normal operations in indefinite.
It is strongly urged that the practice of placing the turntable in
operating condition but holding the platter proper awaiting a cue,
not be followed by operating personnel, as this simply allows the
motor to drive against the idler wheel and it is possible to wear
an indentation into the wheel. As the turntable is provided with
a felt top, where this practice is desired, the operators can hold
the record, allowing the turntable platter to spin underneath the
record. The guide pin, if provided, can be removed if there is any
danger of defacing the record labels.
SUMMARY OF MECHANICAL OPERATION
The CB-11 and CB-21 Transcription Turntable Chassis is so con-
structed in its rugged design and simplicity that it will operate
for years with only normal maintenance and occasional replacement
of the idler wheels. It is suggested that a spare idler wheel be
purchased for your service stock so that no inconvenience will be
had where the idler wheel might require replacing. There is a

thrust bearing in the center bottom spindle on which the bottom of
the platter spindle rides, and care should be taken on initial
installation, and likewise periodical servicing when removing the
platter, that the thrust bearing is not lost. Normal maintenance,
keeping the equipment clean, and impressing on operators that even
the most rugged mechanical device will fail when improperly handled
will assure continued noise-free broadcasting of transcribed programs.
45 RPM ADAPTER KIT
(Used on CB-11 Only)
The 45 RPM Adapter Kit consists of a brass bushing with a plug insert.
The plug slips into the 33 -1/3 RPM spindle of the CB-11 turntable
chassis; also a center pin adapter to accommodate the 45 RPM RCA
records. Two holes have been cut in the top of the turntable platter
which come directly over the motor spindle. The motor spindle will
be found on a direct line between the operating handle and the center
of the platter. To use the Adapter Kit, merely turn the 1 -1/2" hole
so that it is over the motor spindle and slip the adapter into the
spindle. Then place the record adapter over the record pin in the
platter. To operate, turn the operating handle to the 33 -1/3 RPM
position and the turntable will operate at 45 RPM. To go back to
33-1/3,RPM operation, merely remove the adapter from the motor
spindle and the record adapter from the platter and the turntable
is ready for operation in a normal manner. If this kit is supplied
for use with turntable chassis which were shipped from the factory
without this feature, it will be necessary to drill a 1-1/2" hole
in the platter in accordance with the drawing supplied with the kit.
Slight readjustment of the idler wheel yoke and tension spring may
be necessary to obtain correct operation at all three speeds. All
turntable chassis which are equipped for three-speed operation at
the factory have been carefully adjusted for this operation.
IDLER YOKE ADJUSTMENTS
FOR MODEL CB-11 AND CB-21 TURNTABLES
First, it is necessary to loosen the large bolt which holds the
idler wheel bracket in place. Loosen this bolt just enough to
allow adjusting. A large screwdriver for the slotted end of the
bolt and a wrench for the nut are the tools you will need. Adjust
the yoke so both idler wheels engage with the motor drive pulley
just before they engage with the platter.
The 33 -1/3 RPM speed is the more critical of the two as there is
less driving surface on the motor pulley for driving the idler
wheel. When adjusting the idler wheel for this speed, engage the
motor starting switch in the 33 -1/3 position and start platter
rotating. Then stop platter with your fingers. If the wheel is
properly adjusted, slippage should occur between the platter and
the idler wheel and not on the motor drive pulley.
After both wheels-are adjusted properly, tighten bolt holding idler
assembly, making sure assembly does not slip in the process. The
turntable should now operate properly at both speeds and also give
proper torque for satisfactory operation. No adjusting of the
springs on the idler yoke is necessary unless tension of the springs
is weak. If more tension is required, this can be accomplished by
moving the two nuts forward on the threaded shaft.

PARTS LIST
QUANTITY DRAWING DESCRIPTION
1 -A- 7032-401 Drive pulley adapter plug
(For 60 Cycle operation) CB-11
A- W.0.5- /Z
*1 A- 7032-182- Drive pulley adapter plug
(For 50 Cycle operation) CB-11
1 A- 2998-4 Motor Drive Pulley, A -7030"
(For 60 Cycle operation) CB-11
*1 A- 2998-4 Motor Drive Pulley, A- 7795-1
(For 50 Cycle operation) CB-11
1 A- 2998-12 Motor Drive Pulley, A-9296-1
(For 60 Cycle operation) CB-21
*1 A-2998-12 Motor Drive Pulley, A- 9296 -2
(For 50 Cycle operation) CB-21
2 A- 2998-3 Idler Wheels, A- 1939-103
(For 60 Cycle operation)
*2 A- 2998-3 Idler Wheels, A- 7793-1
(For 50 Cycle operation)
1 A- 2998-1 Limit Switch, YZ -2RL, Micro
1 A- 2998-2 Capacitor, .1 mfd., 400 Volt, tubular
1 A- 2998-5 Center Bearing Assembly, A-2400-101
4 A-2998-6 Shock Mounting, 100-F1, Lord
1 A- 2998-7 Capacitor, 2.5 mfd., 330 Volts A.G.,
CRA-3025, C -D
3 A- 2998-8 Truarc Retaining Rings, #5100-43
1 A- 2998-9 Ball Bearing, 1/2" diameter
1 A- 2998-10 Drive Motor
2 A- 2998-11 Springs, A- 1984-1
1 A- 5603-1 Center Pin Adapter Bushing
Note: *These parts used when turntable is operated on 50 cycles.
4

GUARANTEE
This equipment is fully guaranteed by the Gates Radio Company of
Quincy, Illinois, to be free from all defects in materials and
workmanship and will be repaired, replaced or adjusted in accor-
dance with the manufacturer's option and terms as outlined below.
1 - Gates believes the purchaser has every right to expect first -
class quality materials and workmanship and has created rigid
inspection and test procedures plus excellent packing methods
to assure good arrival at destination.
2 - Gates agrees to supply daily factory service, and will make
emergency shipments at any time where possible.
3 - Gates fully guarantees, under normal and proper usage, all
component parts in Gates equipment, except as noted. These
parts will be replaced or repaired at the option of Gates
as follows:
Transmitter Parts: Main power or plate transformer, modula-
tion transformer, modulation reactor, main tank condensers.
(Replacements or Repairs) : Where less than 1 year old - no
charge
Between 1 and 2 years old - 50p
of new price
Moving Parts: Guaranteed for six months.
Electron Tubes: Subject to manufacturer's warranty at the
time of shipment. Adjustment will be made
to the customer as given to Gates Radio
Company by the tube manufacturer.
All Other Component Parts: (Except as listed above or below),
guaranteed for one year.
Abuse: Damage resulting from an Act of God, or by fire, wind,
rain, hail, or any other condition other than normal
usage is not covered by the guarantee.
4 - Date of invoice to original user-purchaser and date of receipt
by Gates Radio Company of notification from the customer will
determine the age of equipment or parts.
5 - In case of adjustment, as on certain transmitter parts listed
above, "new price" is Gates' current price at time of replace-
ment and/or adjustment.
6 - This guarantee covers only Gates manufactured parts and complete
Gates equipments including all parts therein, with exceptions
as noted. Any purchased part not manufactured by Gates will be
subject to the manufacturer's guarantee, unless such part is a
unit incorporated in Gates manufactured equipment.

7 - Transcription pickups, regardless of make, are guaranteed for
ninety days - said guarantee including every associated part
of the pickup except the stylus, which because of its fragility
is not guaranteed by Gates.
$ - ¿here the replacement part in question must be supplied under
the guarantee before the defective part can be returned for
inspection, as might sometimes be required, the customer will
be billed in full and credit or adjustment will be given on
receipt of the defective part in accordance with this guarantee
and the terms herein. In order for credit adjustment to be
received in line with this guarantee the defective or replaced
part must be shipped prepaid to Gates Radio Company or to any
other destination requested by Gates within two weeks of the
date of the invoice covering the replacement part. Any item
alleged defective shall not be returned to Gates until after
written permission has been first obtained from Gates' home
office at your request.
9 - All shipments under this guarantee will be made f.o.b., Quincy,
Illinois, and all materials returned will be shipped prepaid
by the customer f.o.b., Quincy, Illinois.
10 - As a material part of this guarantee the customer agrees to
employ capable technical personnel to maintain all equipment
under this guarantee in good, normal condition, properly
serviced and cleaned, and to use said equipment as and for
the purpose intended by seller. This guarantee does not extend
to the supply by Gates of any personnel to make any replacement,
repair or adjustment.
11 - Gates shall not be responsible for damages to items in trans-
portation or careless handling; or injuries to persons or
damage to property arising out of the use of operation of Gates
equipment or parts, but Gates will supply repair or replacement
items speedily, which will be billed to the customer who, in
turn, will place claim with the carrier, with assistance from
Gates if necessary and when so requested.
12 - Delays in fulfilling any part of this guarantee because of
depleted stock, floods, war, strikes, power failures, trans-
portation delays, or failure of suppliers to deliver, or be-
cause of Acts of God or any other conditions beyond the control
of Gates, does not in any way render Gates liable under this
guarantee; however, every effort will be made to render prompt
service.
13 - Gates agrees that this equipment sold is manufactured, where
need be, under Royalty License Agreements with Western Electric
Company and Radio Corporation of America.
14 - This Guarantee is not transferable from the original user-
purchaser, and no right of subrogation is given herein.
15 - This Guarantee is effective on all standard Gates cataloged
items sold after June 11, 1951.
GATES RADIO COMPANY
QUINCY, ILLINOIS

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