this is the Model 15

this is the Model 15
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SERVICE MANUAL
Technical Data Pertaining to
— Model 15 Chassis
Model 15B Chassis
Model 1 50 :Chassis
Model 25 Chassis
OCTOBER, 1931
Model 15 Chassis. is, Employed in.Havenwood,
Ellswood and SHerwood Models
Môdet 15B Chassis is Employed in Fyfewood Model
Model 150 Chassis is Employed in Castlewood
Phonograph Combination Model
Model 25 Chassis: is Employed in Brentwood,
Chelténwood and Brucewood Models
GRIGSBY-GRUNOW COMPANY
CHICAGO, U.S. A.
PREFACE
The information contained in this Manual applies to the
Majestic Models 15 and 25 Superheterodyne receiver chassis. The
completely new design and progress. shown in these two super-
heterodyne Receivers warrants your careful perusal of this Manual
so that you may become fully acquainted with what is considered
the outstanding achievement in present day Superheterodyne Re-
ceivers. The Engineering Laboratories of the GRIGSBY -GRUNOW
COMPANY have incorporated in these Receivers every available
improvement known to present day radio science. It 1s to your
advantage, therefore, to fully familiarize yourself with the char-
acteristics of this circuit, so that you may intelligently render re-
quiced service for the benefit of the customer in obtaining the
excéllent performance of which these Receivers are capable. There
are several aligning adjustments on the 15 and 25 Chassis, and it
is imperative that this Manual be followed as to aligning procedure
before any attempt ıs made to make any necessary corrections of
alignment.
GRIGSBY-GRUNOW CO.
Technical Data for Pertaining to Model 15 and Model 25 Chassis
The Circuit
MODEL 15. The Model 15 Chassis employs the efficient superheterodyne circuit espe-
cially designed to give full performance with the minimum nib of tube stages. The circuit
from antenna to speaker is arranged as follows: Oscillatdr™and first detector stage, inter-
mediate frequency amplifier stage, second detector and pentode power amplifier stage. In-
cluding the "rectifier, five tubes are employed in the Model 15 Chassis. The Model 15
superheterodyne circuit differs from the customary superheterodyne circuit employed in
compact receivers, in that the design of the pre-selector input circuit gives an “image ratio,”
that gives this receiver perfect freedom from heterodyne interference. =
MODEL 25. The Medel 25 Chassis employs the efficient superheterodyne circuit de-
signed with a greater number of tuned stages to give the characteristics of uniform high
sensitivity, single channel selectivity (10 kes.), and nearly pertect audio frequency response,
The circuit from antenna to speaker is arranged as follows: pre-selector stage, oscillator, first
detector stage, intermediate frequency amplifier stage, second detector {twin power detec-
tion), and push-pull pentode power amplifier stage. Nine tubes are employed in the above
mentioned stages. The Model 25 superheterodyne circuit differs from the regular super-
heterodyne circuit employed in the customary receivers, in that the design of the detector
stage provides an almost perfect fidelity of signal through the detectors to allow an audio
frequency output from the speaker of faithful tone reproduction.
Method of Biasing
Model 15. The necessary bias is obtained on the first detector and oscillator stage
through a 10,000 ohm resistor between cathode and ground. The intermediate frequency
amplifier is biased through the volume control and a balance resistor of 264 ohms which is
contained in the volume control. The second detector is biased through a 40,000 ohm resistor
to ground in the cathode circuit.
Model 25. The radio frequency amplifier, first detector and intermediate frequency
ampliher are biased by the volume control and a balance resistor of 160 ohms contained in
the control which is in the cathode circuit of these tubes. The twin power detectors are
‘biased in their grid circuit by a 250.000 ohm resistor to ground.
ed
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Volume Control System
Model 15. Control of volume is obtained in the Model 15 chassis by a 11,500 ohm control
which controls the bias of the oscillator, first detector and I. F. amplifier stages. This control
1s 50 arranged in the circuit that in addition to controlling the bias of these two tubes, it
controls the input voltage to the pre-selector stage simultaneously, so that a balanced control
system 1s obtained.
Model 25. Contro! of volume is obtained in the Model 25 chassis by a 6500 ohn: control
which controls the bias of the radio frequency amplifier, first detector and intermediate fre-
quency amplifier stagés.
Sensitivity
In cases where low sensitivity is encountered, the first step taken to remedy the condi-
tion should be the checking of the radio frequency type G-51 and G-51-S Tubes. Tubes
having a low amplification factor in any of these positions, will seriously affect the sensitivity
of the receiver. These procedures should always be taken prior to any attempts at remedy
by realignment of the condenser gang.
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Power Supply System
Model 15. The power supply system of the Model 15 chassis consists of a power trans-
former, filter unit and dynamic speaker field. The filter unit contains two 8 míd. especially
designed dry electrolytic condensers, and the speaker field which acts in the capacity of a
choke.
Model 25. The pgwer Mp y system oí the Model 25 chassis consists af a power trans-
tormer, filter unit and dynamic speaker field. The filter unit contains two 8 mid, especially
designed dry electrolytic condensers, a liberally designed choke and the speaker field in
addition.
Alignment
In checking the alignment of the Models 15 and 25 chassis, the intermediate frequency
transformers should not be aligned unless there is definite reason to believe that they are
out of alignment. The alignment of these transformers at the factory is more or less perma-
nent, and should not need further adjustment, except in rare cases.
IN ALL ALIGNMENT PROCEDURE AN OUTPUT METER MUST BE USED.
К. F. and Oscillator Alishment
L " L " = = = - !
1. Tune in station in the vicinity of 1500 kilocycles, or put output of local oscillator
(It available) into receiver.
€ Align R. F, stage, and oscillator tuning condenser. The В. F. stage and oscillator
aligning condensers are on the gang condenser,
Oscillator Tracking Condenser Alignment
I. Tune in local oscillator to 600 kilocycles.
2. Adjust both tuning control and tracking condenser simultaneously to give maximum
signal as noted on output meter. This will be obtained by rocking tuning control across
resonance point while adjusting tracking condenser to give maximum output at the point
of resonance. This operation cannot be performed without local oscillator and output meter.
Check
Check the alignment previously made of R, F. and oscillator aligning condensers in the
vicinity of 1500 kilocycles,
New G-27-S, G-24-S and G-51-5 Spray Shield Tubes
The new Majestig Spray, Shield Tubes are a distinct advancement in the art of tube
design. The principal advantages of the Spray Shield Tube are as follows:
> 1. More efficient shielding of each circuit,
2. More amplification possible per tube stage.
3. Regeneration reduced to a minimum,
+. Improved tone quality due to absolute stability of the amplifier stages.
The above advantages overcome some of the principal problems that have been holding
hack the design of high sensitivity receivers with the requisite tone quality,
“Off” and “On” Line Switch
The “of” and “on” switch on both the Model 15 and 25, is attached to the volume
5
mek mm EE de —]]]]—]]Ú—;—]—_—_]] ede A un. LEE
control shaft. Turning the volume control completely to the left shuts the receiver off, The
first fifteen degrees rotation of the control to the right will turn the receiver on. The balance
of rotation to the right controls the volume of the receiver,
Models G-10-B, G-11-B and G-13 Dynamic Speakers
The Model G-10-B Dynamic Speaker has a field resistance of 1/30 ohms at 78° IF. The
Model G-10-B Dynamic Speaker field structure is of the heavy “U” construction, This
speaker is used In conjunction with the Majestic Superheterodyne special cone.
The G-11-B and (G-13 Speakers employ the same structure as the G-10-B, but are used
in conjunction with larger size cones to match acoustic properties of the cabinets in which
they are employed. The Model G-10-B Speaker employs a hum bucking coil as an additional
aid in the filter system in the Model 13 chassis. This coil consists of a small winding around
the field coil and is connected in series with the cone coil. This winding induces hum into the
cone coil circuit in opposite phase to any hum that passes the filter system. lhe effect 15 a
cancellation which reduces hum to a minimum in the speaker.
Antenna and Ground Terminals
Terminals are provided on the Models 15 and 25 chassis for antenna and ground con-
nections. Antenna and ground terminals are located at the rear of the chassis, and clearly
marked. Normal antenna length should be approximately 30 to 40 feet. When the receivers
are to be operated in localities several hundred miles distant trom broadcasting stations, a
longer antenna 15 recommended. In such cases where consistent long distance reception will
be requtred, antenna length should be approximately one hundred feet.
COLOR CODE
Power Transformer
Model 15
Primary Start of Winding —Yellow
Finish of Winding — Yellow .
Start of Anode — i el low
Center Tap (Anode) —Black
Finish of Anode — Кей
Start of Heater —Yellow
Finish of Heater — Yellow
250 Fil. Start — Black
280 Fil. Finish — Black
Model 25
Primary Start of Winding — Yellow
Finish ot Winding —— Y el low
Start of Anode — Red
Center Tap (Anode) — Black
Finish of Anode — Red
Start of No. 1 Heater — Black
Finish of No. 1 fHeater —Black
Start ot No. 2 Heater — Yellow
Finish of No, 2 Heater —Yellow
Start 5 v. Fil. — Black
Center Tap No. 1 Heater —Red
Fmish 9 Y, Fil, — Black
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