Stromberg-Carlson 585 Engineering Data

ENGINEERING DATA
STROMBERG-CARLSON NO. 585 RADIO RECEIVERS
STROMBERG-CARLSON TELEPHONE MANUFACTURING COMPANY
ROCHESTER, NEW YORK
IDENTIFICATION TABLE
Model Input Power Frequency Chassis Cabinet Speaker
585-M 50-60 Cycles 32711 31088 31087 (Bass)
31126 (Treble)
SPECIFICATIONS
Tuning Ranges_
Voltage Rating_
Type of Circuit_
Number and Type of Tubes—19
1—6SK7 R. F. Amplifier (A. M.)
1—6AB7 R. F. Amplifier (F. M.)
1— 6F8G Tuning Indicator Amplifier
2— 6SA7 Oscillator and Modulator
1—6K7 I. F. Amplifier
3— 6SK7 I. F. Amplifiers (F. M.)
1—6H6 Demodulator, A. V. C., "Q"
1—6SJ7 Limiter
Frequency Modulation 42 to 50 Me. (42,000 to 50,000 Kc.)
Shortwave 5.8 to 18 Me. (5800 to 18,000 Kc.)
Standard Broadcast .54 to 1.7 Me. (540 to 1700 Kc.)
-105 to 125 Volts
-Superheterodyne with Electric Tuning
1—6R7 Audio Amplifier
1—6H6 Demodulator (F. M.)
1— 6C8G Audio Inverter
2— 6L6 Power Output
1—6H6 Tuning Indicator Rectifier
1—5Z3 Rectifier
1—6AF6G Tuning Indicator
Input Power Rating_ _
Intermediate Frequency_
Speaker Field Coil Resistance—Approximately_
Speaker Voice Coil Impedance at 400 Cycles—Approximately
- 225 Watts
455 Kilocycles (Amplitude Modulation)
4.3 Megacycles (Frequency Modulation)
(1125 Ohms (Bass)
^
2
oo Ohms (Treble)
(24 Ohms (Bass)
' ' " (11 Ohms (Treble)
FEATURES
GENERAL. This is a nineteen-tube, three gang, three
range receiver designed for the reception of both am¬
plitude and frequency modulated stations and is
equipped with a dual coaxial speaker system. It is
capable of reproducing without distortion an audio
frequency range of at least 10,000 cycles.
The chassis is of the fortified type with bails provided
for ease in handling and servicing. Automatic tuning
is accomplished by means of a motor drive controlled
by a commutator and brush assembly and the dial is
of the slide rule type, edge-lighted for clear visibility
without glare. Separate treble and bass controls are
provided to make accurate adjustment of the tone
possible.
A remote control unit is provided with this receiver
which enables the user to operate the receiver at a
remote point.
The power output of this receiver is excellent and the
tone quality and fidelity of reproduction is finer than
anything produced commercially to date.
FREQUENCY MODULATION: The "Armstrong Widc-
Swing Frequency Modulation System" used in this
receiver is an outstanding development in radio. It
makes possible:
1. Static-Free Reception;
Both natural and man-made static is virtually
eliminated.
2. Noise free reception;
The tube and set noises present in ordinary am¬
plitude modulation receivers are virtually elim¬
inated.
3. Extreme high fidelity reception;
Noise free reproduction of an audio range lim¬
ited only by the capacity of the human ear or
the audio system of the receiver is possible with¬
out interference.
4. Interference free reception;
Two stations cannot be received at the same
time.
This system is patented and Stromberg-Carlson man¬
ufactures these receivers under an Armstrong license.
The Federal Communications Commission has estab¬
lished 40 channels between 42 and 50 megacycles for
frequency modulated transmitting stations. Since this
is a comparatively high frequency, the distance over
which reception is possible is limited. It should also
be noted that the fidelity may be limited by telephone
lines, or by program transcriptions, although this con¬
dition will, undoubtedly, be improved as time goes on.
SPEAKER SYSTEM. A coaxial dual speaker system
is used in this receiver. The low frequency speaker
owes much of its effectiveness to the unusually large
field structure with a subsequently increased mag¬
netic flux in the air gap. The treble speaker with its
back completely enclosed is mounted directly in front
of the bass speaker; both speakers are connected by
means of a frequency dividing network to the re¬
ceiver at an impedance of 24 ohms. The Acoustical
Labyrinth is used in conjunction with this speaker
system and the complete system is capable of provid¬
ing a relatively even response to all tones from 65 to
more than 10,000 cycles per second.
SPECIAL CIRCUITS. A tuning indicator having two
apertures is used with this receiver. For tuning sta¬
tions on the standard broadcast and short-wave range,
one aperture is for strong signals and the other for
weak signals. One aperture will close with a signal of
approximately 100,000 microvolts and the other will
not close even with a two volt signal. Stations on the
frequency modulation range should be tuned for max¬
imum closing of both apertures.
Iron core coils are used in the broadcast and short¬
wave ranges to provide greater accuracy of alignment.
The audio system employs a special inverter push-
pull circuit designed to provide excellent fidelity, and
the chassis is thoroughly shielded throughout with an
electro-statically shielded power transformer.
P-33101 Issue 1 Printed in U. S. A.