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RAYMER
MODEL 869-15 AM-FM RECEIVER
OPERATING INSTRUCTIONS
DESCRIPTION
The Raymer Model 869-15 is a monaural solid state background music receiver consisting of a sensitive high fidelity
AM-FM tuner and a 15 watt (RMS) audio amplifier with microphone pre-amplifier. The unit has an external amplifier
jack, tfnd Aux/Phono jack, a Multiplex Converter jack, and a microphone jack. It also has speaker outputs for 4 or
8 ohms as well as 25 and 70 volt line. Provision is made for matching either a low or high impedance microphone
to the input of the amplifier by means of a selector switch.
The receiver also features an electronic switching (PRECEDENCE) circuit in place of a relay to quickly fade out
the music while paging; after the page, the music is smoothly restored.
UNPACKING:
The unit is to be removed carefully from the carton and inspected for any possible damage m transit. If there is any
evidence of any damage which might have occurred in shipment, notify your dealer at once, or the transportation
company which delivered it. Claims for damage sustained in transit must be made upon the Carrier. Save all packing
material for inspection by the clafm agent who will furnish you with the proper forms and will also give you the
necessary instructions for filing a claim. In addition to the Unit, there should be a warranty card included in the carton.
To insure proper servicing and to protect your rights under the warranty, be sure to fill in the warranty registration
card without delay and mail to the factory.
WARRANTY
This unit has been very carefully inspected and should require no further service. Each unit is warranted to be free
from defects in material and workmanship under normal use and service for a period of one year from date of delivery
to the original purchaser. If this unit appears to be defective, the factory will repair any unit returned within said
one year, providing all transportation charges are pre-paid, and which our examination shall disclose to our satisfac¬
tion to be defective.
This Warranty does not include free labor, nor is it applicable to any unit which shall have been subject to accident,
tampered with, mis-used, abused, or altered in any manner whatsoever. Further, this Warranty shall not apply to any
unit which has been connected improperly.
It is recommended that any unit on which service is required, be processed through your dealer wherever possible.
This Warranty is expressly in lieu of all other Warranties, expressed or implied, and of all other obligations or liabil¬
ities on our part. We neither assume nor authorizeany other person to assume for us any other liability in connection
with the products manufactured by Trutone Electronics, Inc.
INSTALLATION:
Because of its attractive appearance this unit may be placed on a table or a shelf. Although the unit has ample vents
for normal ventilation, sufficient space should be allowed around it to permit free air flow. DO NOT PLACE it on top
of vacuum tube equipment. DO NOT STORE OR OPERATE it in areas where the ambient temperature exceeds 140
degrees Fahrenheit. If installed in a cabinet, ample ventilation must be allowed around the unit.
Plug the AC line cord in any outlet furnishing 105 to 120 volts, 60 cycles AC.
An AC receptacle is located on the back of the chassis to supply power to other components such as phonograph
motor, etc. The auxiliary equipment connected to the AC receptacle is controlled by the POWER on-off switch so
that turni*ng off the unit turns off all equipment.
OUTPUT CONNECTIONS
All connections ore made on the rear panel of the unit.
The speaker(s) or line matching transformers are connected to the screw terminal board located on the rear panel.
Connections are to be made between the terminal marked GND (O) and the impedance or line voltage according to
the type of output required. For short distances any ordinary insulated wire, such as parallel lamp cord,may be used.
Connecting a total load impedance at any tap less than the impedance indicated will deteriorate the performance of the unit.
When a speaker with an impedance of 8 ohms is connected to the amplifier, use the terminals on the amplifier marked
GND and 8a. For a 4 ohm speaker or two 8 ohm speakers in parallel, use GND and 4 a.
Connecting to the 25 volt or 70 volt tap on the unit permits the use of a number of speakers each with its own cor¬
responding line matching transformer, thereby eliminating the necessity of calculating impedances. The tap on the
line matching transformer is selected to give the power desired for each speaker. The total of all the power settings
should be no greater than the amplifier output rating.
Long lines have an appreciable resistance with a resultant power loss. The use of parallel matching transformers
on either 25 volt or 70 volt lines is recommended for long distances. When it is desired to have less than 15% power
loss on low impedance lines and 5% on high impedance lines, the following table may be used as a guide for the
proper wire size to be used. In all cases, it is advisable to run as heavy a wire as possible consistent with the
requirements.
WIRE SIZE
B & S
MAXIMUM LENGTH OF LINE BETWEEN OUTPUT AND LOAD
4 Ohms
8 Ohms
42 Ohms (25V)
332 Ohms (70V)
14
125'
250*
400’
3600’
16
75’
150*
250*
2200*
18
50*
100*
160’
1400*
20
25’
50*
90‘
900*
The External Amplifier (EXT. AMP.) jack is to be used when it is desired to connect to an external amplifier for
greater power. It can also be used xo feed the signal from the tuner to a tape recorder which has an Aux or Line
input. Both the external and internal amplifiers will operate simultaneously when the external unit is plugged in
the EXT. AMP. jack.
The Multiplex jack can be used for connecting to a Multiplex Converterto receive simultaneous signals on both FM
and Multiplex broadcast, and for Multiplex Stereo Reception.
INPUT CONNECTIONS
All connections are made on the rear panel of the unit, and are clearly identified.
For FM reception a short wire attached to the antenna terminal is sufficient for most locations. In the event that the
unit is located in a remote area an external Dipole antenna will increase the efficiency and a number of distant
stations can then be received. This external antenna is to be connected across the terminals marked ANT.
The AUX/PHONO input jack enables the unit to amplify program material from a source other than the self-
contained radio tuner. This input is high impedance with a maximum sensitivity of one-half volt and will accom¬
modate the output of a ceramic phono cartridge or the output from any preamplifier such as tape, phono, etc.
If the source into the auxiliary input is from leased telephone lines, a Raymer TM-2 telephone adaptor is required to
match the telephone lines to the AUX input.
The microphone input jack is for an unbalanced line only. If it is necessary to use a balanced input, an outboard matching
transformer such as Raymer Model LMT-150 must be used. If the signal source is a telephone line or a 500 ohm input, the
connection can be made to the amplifier by means of a Raymer Telephone Matching Adaptor TM-1 or TM-2. The switch
above the microphone input selects the proper input impedance. The Hi-Z position will match either crystal or high imped¬
ance dynamic microphones; the Lo-Z position will match microphones in the 150 to 500 ohm range.
CAUTION
TO AVOID POSSIBLE SUPERSONIC OSCILLATION WHICH MIGHT RESULT IN DAMAGE TO THE UNIT, IT IS
MANDATORY THAT A SHIELDED (METAL COVER) MICROPHONE PLUG BE USED.
If it is desirable to fade out the music while paging, a "dispatcher* type of microphone, such as Raymer Model 201.
or an equivalent microphone with an auxiliary switch should be used. The microphone is to be connected as shown
in Figure 1.
PHONE PLUG MUST HAVE METAL COVER
^DlSPATCHEf* TYPE
MICROPHONE
RAYMER 2 01
OR EQU IV.
CONTROL CIRCUIT
FIGURE I I TYPICAL CONNECTION FOR A SINGLE MICROPHONE .FOR MORE
THAN ONE MICROPHONE,CONNECT CONTROL CIRCUITS IN PARALLEL.
When output leads are run near an unshielded microphone input plug or when run together with the microphone
precedence leads, a supersonic oscillation may take place. When this does occur, it will appear as a distortion in the
amplifier output. To prevent this oscillation it is necessary that shielded microphone plugs be used.
OPERATION:
The front panel has five knobs and two slide switches. The functions of the knobs are as Indicated. The Mic.
Volume control knob adjusts the level of sound for paging or public address, and is independent of the Music
Volume control knob. The Music Volume control knob is used to adjust the level of the sound of the AM and FM
portion or phonograph. The Tone control knob can be turned to the position that is most pleasing to the listener as
it affects both the high and low frequency response. The Function knob is used to select the AM band, the FM with¬
out AFC, or the FM with AFC. The Tuning knob is to select the desired AM or FM station. The Music switch is
used to select tuner or phono. The slide switch at the lower left is to turn the unit on or off.
AFC refers to “Automatic Frequency Control" and is an electronic means of keeping the receiver properly tuned to
the FM Broadcasting station. Even if the FM Tuner Pointer is not in the exact center of the channel, the AFC will
automatically pull in the station to the proper point. However, in tuning a week station adjacent to a strong one, even
if the AFC is in an operating position, it may lock on the stronger signal. It is for this reason that a selector switch
has been provided for disabling the AFC.
For normal operation on FM, the Function knob should be turned to the AFC position. For very precise tuning, or
for tuning a weak station next to a powerful station on FM, it is suggested that the knob be set in the FM position
until the station is received the loudest. The knob is then to be turned to the AFC position and the station will be
properly tuned and locked in position.
For AM reception. Model 869 has a built-in Hi-Q Ferrite loopstick antenna which is all that is normally required for
local AM reception. To increase the reception of weak AM stations in the fringe area, it may be advisable to rotate
the loopstick to obtain the loudest signal. Where greater sensitivity is required, connect an external antenna to the
metal lug on the hinged end ol the loopstick, as indicated below.
The center marking on the dial glass is a LOG scale for easy recording of the position of the pointer for any spe¬
cific station.
Made in U.S.A. by
TRUTONE ELECTRONICS, INC . 7315 Fulton Avenue • North Hollywood, California 91605 • (213) 875-0423
NOTES}
». RE5I5TCR VALUES ARE IN OHMS UNLESS
OTHERWISE INOICATEO.
2. CAPACITOR VALUES ARE IN tabtf,EXCEPT
DECIMAL VALUES ARE IN mf, OR WHERE
INDICATED AS mf.
3. CAPACITORS MARKED* ARE PART OF
I.E TRANSFORMER.
♦.voltages shorn are typical only
ANO may VARY»MEASURMEN TS TAKEN
NlTH V.T.VN IN NO SIGNAL CONDITION.
TRUTONE ELECTRONICS INC.
NC.HOLLYROOD ,CALIFORNIA
RAYMER
MODEL 869-15
IS WATT AM/FM RECEIVER WiTh PAGING