Electrical Research Lab 6315 Schematic

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Product Information:
Model:6315
Manufacturer:Electrical Research Lab (Sentinal)(ERLA)

Schematics Content:

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Page 1:

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PAGE , 5-8 ERLA

MODEL sooo, 6515,

Aligmnent,Vo1tage ELECTRICAL RESEARCH LABS.

SBJRT WAVE ThmER: A short wave trimmer control is incorporated in the receiver and is used for a fine
ng adjustmen w en tuning for short wave reception from 1.5 negacycles to 24 megacycle s. The land
selector switch knob consists of two sections. The small front section knob is used for adjusting the
short wave trimer and the large rear section is the band selector stitch knob. 'hon tuning for short
wave reception always rotate the tuning control slowly until a station is heard with maximum volume. Don't,
light? stimiove; th: Stall-or pas's up axq weak signals. After adjusting the tuning con-trol so as to
ng e s a. on n a s oudest point sdJust the short wave tri-mer control r
first in the clockwise and then in the counter-clockwise direction to the positisz 2? :isstigiez 53,1321' kgob
casionslly after tuning in this manner still better results may be obtained by readJusting the tuning-conc-
trol,o.nd then further fine adJustmont should be made with the short wave trimmer for maximum volume It _
may be found that when adJusting the short wave trimmer that the signal 'ill disappear, indicated by the
elimination of signal, static and background noises. Rotating the short wave trimmer control slightly ei-
ther clockwise or counter-clockwise will bring the signal in again. When operating the receiver on the
broadcast band (1500 LC. to 540 LC.) the trimmer is inoperative.
Line Voltage : 115
Volume Control: Pull on

Wave Band a Broadcast
Grid Grid Grid

TUBE Fil. Plata Screen Cathode Volts No.1 No.2 No. 3 8: 5
&7 Oscillator lst Detector 2.45 220 2.2 5.5 200 90
58 First I. F. Amplifier 2.45 220 90 6
58 Second I. F. Amplifier 2.45 220 90 3.5
2A6 Second Detector 2.45 12054# l
$5 Output 2.45 210 220
BO Rectifier 4.89

*f Triede Plate. Comparative voltage only. The voltmeter is in series with a high resistance and is there~
fore not the true voltage applied. Read all voltages from socket to chassis unless otherwise specified.

ALIGMNT PROCEIIIRE: Only When an Etenna, oscillator or I. F. transformer has become defective due to an
open or shorte w nding should it be necessary to realign the receiver. For aligning either the intermedi-
ate transformer or variable condenser it is necessary that an oscillator be used with some type of output
measuring device.

l. Connect the high side of the oscillator output to the control grid of the m First Detector tube,
leaving the grid clip disconnected. The ground side of the osrillator should be connected to the chassis.

2. set the oscillator st 465 kilseysles (this must be accurate) and. soJost use output of the emulator
so that a convenient reading '1s obtained on the output meter.

3. Align the first intermediate transformer by turning the brass hex nut of the first intermediate
transformer trimmer up and down until maximum reading is obtained on the output mater, then adjust the trim
mer sore' located inside of the brass hex nut in the same manner. The intermediate transformer trimmer
screws are accessible through the els-11 hole in the top of the intermediate transformer shields.

.4. The second and third I. F. transformers should next be. adjusted in the some manner as the first LP.

TO ALIGN THE! VARIABLE CONDENsz It is important when aligning the variable condenser and padding' conden-
sers to follow the procedure given carefully, otherwise the receiver will be insensitive and the dial cali-
bro-tion will be incorrect.

l. Connect the high output side of the oscillator to the antenna and the ground to the chassis.

2.' Place the band selector switch for operation on the 1.5 to 4 megacycle band. Tune the receiver to
exactly 1.'7 megacycles onthe dial, set the short wave trimmer about half the distance between maximum
clockwise and counter-clockwise rotation and adjust the oscillator frequency to exactly 1.'7 megacycles. '

Iext, bring this 1.7 megacycle signal in to maximum output by sdJusting the padding condenser accessible
through the hole in the right hand side and closest to the rear or the chassis.

3. Leave the band selector switch for operation on the 1.5 to 4 megacycle band and tune the receiver to
exactly 5.4 megscycles on the dial.

Next, set the test oscillator to exactly 5.4 megscyoles and. tune the si$l in by adjusting the oscillator
variable condenser trimmer mounted on top of the variable con nser, e m1 e section o e var-12x e
condenser is the oscillator section. Recheck the 1.7 megacycls adjustment after making the adjustment at

4 megacyclee. For best results it is always advisable to check each sdJustmuZ several times. lOTE: This
completes the short wave adjustment.

4. AdJust the band selector switch for operation on the broadcast band (1500 to 540 kilocyoles) and
tune the receiver to exactly 1400 lcllocycles on the dial and set the oscillator to this frequency. Turn
the receiver on end and bring this 1400 kilocycle signal in to maximum output by adjusting the trimmer ecre
I on the small trimer,vhich is located adJacant to the short wave switch underneath the chassis.

Next, adjust the antenna and preselector variable Condenser section trimmers mounted on top of the variable
condenser for maximum signal output. These 'are the front and rar gang sections).

5. Leave the band selector switch for operation on the broadcast band (1500 to 540 kilocyclee) and tune
the receiver and oscillator to approximately 600 kilooyclee. Then adjust the 600 kilocycle padding conden-
ser which is located on the right hand side and towards the front of the chassis for maximum output reading.
This adJustment is quite critical and it is necessary to rock the condenser slightly to the right and left
to obtain maximum sensitivity.

I Always recheck the 1400 kilocycle alignment after making the sdJustment at 500 kilocycles. '

Page 3:

ERLA PAGE 5-9

MODEL 6300 , 6515

ELECTRICAL RESEARCH LABS. Puts mam"

SIX TUBE SUPERB'ZERODYIE RECEIVER

Band No. 1 ~ from 10 legacycles to 24 legacyclel
Band No. 2 - from 4 llegscycles to 10 Hegacycles
Baud No. 3 - from 1.5 legacyclss to 4 legacycles
Band Ho. 4 - from 1500 Kilocycles to 540 Kilocycles

Selection of the desired frequency hand is made with the band selector switch knob s e

double knob) which is located on the lower right front of the cabinet below the tuningrgonzsgl :33.or'hen
the band selector switch is placed in the mximum left hand position the receiver is operating on Band

lo. l, 10 megacycles to 24 negacycles. Rotating the band selector knob in the clockwise vdirection the
three other positions are in the order named, knd No. 2, 4 megacyclee to 10 megacyclcs, End No. 5 1.5 to
4 megacycles and kno Ho. 4, 1500 kilocyoles to 540 kilocycles. All four frequency bands are calibrated on
a single dial. The calibrated section of the dial for the band that the receiver is adjusted to operate on
is indicated by the dial indicator which is automatically adJusted by the band selector switch knob.

SHORT WAVE RECEPTIOK- The usual carsless tuning that is sufficient to bring in the long wave length regu-

lar Broadcast tations will fail in tuning in short wave reception. In tuning for shcrt wave stations,
1," great care must be taken so that the stations are not passed over, as the tuning is ver sharp and guite
f critical. lsny times s lack of rmlts when tuning for short wave stations is due no only to thopemtor
`tuning the receiver incorrectly, but also to the operator trying to pick up foreign and North American
short wave stations when the stations are not broadcasting. An important consideration is the time di!~
ference between the United States and European Countriesgie., at 10:00 PJ. Central Standard Time it 1.
4:00 A. ll. in England and 5:00 A. ll. in most other countries in maps and, as s rule, no station. u-e bm
casting at that time. While short wave reception presents a varied and more thrilling entertainment hm
we have been accustomed to hearing on the broadcast band, the mnny peculiarities and difficulties of short
"va reception have been minimized and the possibilities over-omphnsized, which has resulted in the er-
roneous belief that reception of foreigx short wave stations is an easy accomplishment. To the contrary,
short wave stations are not tuned in with the ease we have been accustomed to in tuning in local broadcast
stations, but requires patience, extreme care in tuning, an understanding of the proper procedure and
favorable conditions. Reception of short wave stations, as a rule, is not comparable to the clear, static-
free programs received from the local broadcast stations, but is more erratic and is generally accompanied
by fading and static although occasionally reception may be as good as local programs.

I Reception of short wave stations varies from season to season and between daylight and after Sunset.

Bend Ko. 4 (regular broadcast band) from 1500 to 540 kilocyolss varies also in that the range of the
station is materially increased after dark and fading of distant stations becomes more pronounced. In
some locations stations that are received during daylight occasionally i'sde so badly after sundown that
it is impossible to receive good reception after dark. Other stations which cannot be heard during day-
light provide good reception after darkness.

End lo. 3, 1.5 to 4.0 mogacycles permits reception of police calls and some amateur phone stations.
'his range of the stations broadcast within this band is increased after sundown.

Bend lo. 2 from 10.0 to 4.0 mqscycles includes the 49 meter band, the 31 unter band and some amateur
stations. Stations broadcast within this band include many of the foreign short wave stations and North
American Stations. Reception of stations transmitting on the 49 meter band is most reliable during the
Sx-er months when located approximately 300 miles or more during daylight which increases to 1,500 miles
or more when a large portion o! the signal path lies in darlmess. 'me Winter range is approximately 600
miles during daylight and 2,000 miles or more after sundcwn. Stations operating on the 51 meter band are
most reliable when the receiver is located about 800 miles away during daylight in the Sumsr months in-
creasirg to 2,500 miles after sundown.

land Ho. l, from 24 msgacycles to 10.0 memcycles includes the 25, 19 and 16 meter hands. Reception
of stations in the 25 mater band is best during daylight when the receiver and transmitter are located
1,000 .iles or less than 2,000 miles apart. "ter sundovn reception may be expected only from stations
located a distance of 2,000 miles or more away from the receiver. Stations operating on the 19 meter band
U provide satisfactory reception generally during daylight hours only. After nightfall or when any appreci-
/'\ able portion of the transmission path is in darkness signals are rarely heard. Stations operating below 19
meters are generally useful only when transmitting during dayliyit and over s distance of 2,000 miles or
more. Ordinarily they cannot be received after sunset.

1039 Broadcast, Antenna, Preselsctor a Oscillator Coil
1085 Short Wave Oscillator Coil
1002 short wave Antenna o nrsf. Detector con iggg "mangogzgelgesutor strip
1058 First I. F. Transformer 9671 Pilct Lamp socket
9855 Second l. F. Transformer 5248 2_5 you Pilot'mp Bulb
9562 Hurd I. F. Transformer 593? Tube shield
9500 R' F- Ch?k? . 9002 'robe shield Cap
S'IBS 10.00? 0m 'PM "Fm" 9459 .0005 lard. molded condenser
'7998 1 Iles Ohm 1 We" ""1"" cess 1 nfs. loo volt condenser
S906 250.000 Ohm 1/5 '8" "HHN" 9205 .1 no. 400 veit condenser
6800 6.000 Ohm 1/5 'PM ""1"" seas .1 no. zoo voir. condenser
9287 Short Wave Trimar- Disc. Assembly 5951 ,05 nd, 400 vol; Condenser
9682 Short Wave Tri-mer Worn Tunine R?d 10'1'1 .as urs. a. .004 nfs. 400 volt condenser
9675 Peddine Condenser 1170 .0005 no. a .05 lard. 400 volt condenser
9674 Paddlnc 00nd?n=er 9591 .001 lfd. a .05 sro. 400 voir. condenser
9799 Tri-'mer C?nd=naer 6765 .2 nfs. 400 veit condenser
9659 Electrolytic Condenser Dual B lLfd. 9.052 ,2 "fm 200 Volt, condenser
,/` 8876 Electrolytic Condenser 5 lard. ' 184 500.000 mm 1/3 'on Resistor
1110 Electrolytic Condenser 4 le. 500? 100.000 ohm 1/3 'get Resistor
'3660 POW" Trlnefwmer save 50,000 ohm 1/3 van Resistor
9665 Dyna-mic Speaker 5' sooo 25,000 on.. 1/5 vet: Resistor

9'725 Dynamic Speaker B' os'ls 250 ohm 1/5 watt Resistor
9556 Volume Control 799-7 2_000 ohm 1/3 'its Roni sto;-
9174 Tone Control

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