Scott Radio Labs., Inc. 515 Schematic

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Manufacturer:Scott Radio Labs., Inc.

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Page 1:



Model 515 Radio-Phonograph


The Model 515 is a combination designed for the reception of radio
broadcast programs and for the reproduction of phonograph records, and
other external sound. The receiver includes the following separate
pieces of equipment: (1) radio-phono chassis, (2) power amplifier,
(5) record changer, and (4) coaxial high fidelity speaker.

Power Input 140-150 watts at 50-60 cycles. (Phono motor 60 cycles,

25 watts additional.) Taps are available to accomodate
power line voltages of 105, 125, 150, 210, and 250.

Tubes Total ll and 2 rectifiers.
Circuits Superheterodyne with RF amplifier stage (three gang

tuning condenser) on all bands. Two stage AM-IF (455 kc)
Push-pull output with 6 db inverse feedback. Separate
B plus supplies for power amplifier and tuner sections
for reduction of temperatures and to prevent damage to
components through surges. Sound input for phono and
other external sound.

Tuning Range AM - 555 - 1620 kc

Output 20 watts (2-6L6 tubes in push-pull). Less than 5% dis-
tortion at full output.

Sensitivitx Less than 10 microvolts on any band.
(Carrier modulated 50% at 400 cycles. Output 500
milliwatte with 10 db signal to noise ratio.)

Fidelitz Overall 50 to 20,000 cps plus or minus l db. Separate
bass and treble control. Phono input equalized for
elimination of objectionable scratch level.

Speaker Hi-fidelity 12-inch coaxial PM. 8 ohm voice coil.
General Tuner chassis 12 1/4" wide x 8 1/2" high x 15" deep.

Weight 10 lbs. Polished chrome. Power amplifier
chassis 12 1/4" wide x '7" high x 9" deep. weight

23 lbs. Polished chrome.

Five controls - Station Selector, Function Switch,

Hum level 65 db below maximum output.

Antenna - AM (built-in) loop and SW (built-in) antenna.
Provision for connection of external antenna.

Dial counter weighted - slide rule type - illuminated
glass scale - full 7 inch travel - color dots to
identify function - 0-100 logging scale. Unit con-
struction of chassis, dial escutcheon, and knobs
permits complete ease of installation, nothing to

(C)John F. Rider

Page 2:



The Model 515 Radio-Phonograph comes complete with all equipment in-
stalled and ready for operation after taking the following few pre-

l. Remove any packing material which may be used to hold the larger
tubes in place.

2. Release the hold-down screws which hold the phono mechanism
securely for shipment. These screws require only a few turns and
when they are in the correct position the mechanism will be ob-
served to float freely on the spring suspension. Do not remove
the screws. Remove any tape or rubber bands which may Ee holding
the pickup arm or accessories in place.

3. Check to make sure that power transformer tap is connected for
the power line voltage.

4. Plug in the a.c. line cord.


The Model 515 is equipped with built-in antennas for both AM and SW
reception. These antennas will be found adequate in most locations
to receive all the stations in the service area. In locations remote
from broadcast transmitters, or in locations shielded from the trans-
mitters, outdoor antennas will give improved reception.

For reception under difficult conditions, the installation of a SCOTT
Super Double Doublet All-Wave antenna is recommended. When this all-
wave antenna system is used, connections to the antenna terminal strip
should be as follows: One of the wires in the twisted pair is con-
nected to terminal marked "GND", The other wire in the twisted pair
is connected to the terminal marked "2". A short wire jumper should
be connected from terminal "1" to terminal "2".

For single wire antenna installation the connections at the antenna
terminal strip should be as follows: Connect antenna lead to terminal
marked "2". A short wire jumper should be connected from terminal "l"
to terminal "2".


Station Selector- The large center knob serves to adjust the receiver
to the desired station. The dial pointer follows the rotation of the
knob and indicates the frequency to which the receiver is tuned.
Assigned frequencies of broadcast stations are listed on the radio
page of your newspaper.

Volume Control - The knob directly to the left of the large station

selector knob serves to adjust the volume of sound. Turned to the

right the volume is increased, and turned to the left the volume is

decreased. The control is designed as to give a smooth and gradual
control of the sound volume.

(C)John F. Rider

Page 3:


IService Functions - The knob directly to the right of the large station
selector knob serves to adjust for the various functions desired. As
indicated on the escutcheon, and identified by colored dots on escutch-
eon and dial glass, the functions are AM broadcast, shortwave l, short-
wave 2, phono reproduction, and an external connection which may be a
separate record player or a crystal microphone.

Treble Control - Second knob to the left of station selector. This
control acts to regulate the degree of higher audible tones sent to the
loudspeaker. Turned completely to the right gives the maximum of high
audio response. Turned to the left gives a minimum. The range of con-
trol gives the user an opportunity of adjusting the reproduction to his
own desires.

Off-On Bass Control - This knob is the second to the right of the sta-
tion selector. Turned slightly from its extreme left position it serves
to turn on the power to the radio receiver. Turned further to the right
it increases the amount of low frequency audio, or bass reproduction.
The control may, therefore, be set at the position giving the listener
the amount of bass reproduction he desires. Generally the treble and
bass controls, being independent, can be individually adjusted for the
best balance in reproduction which, naturally, will vary somewhat with
individual preferences.


To receive broadcast stations after the Model 515 is installed proceed

l. Turn the knob marked "OFF-ON BASS" to the right and advance about
half-way. The dial lights will illuminate indicating the receiver
is correctly connected to a power source. Allow about thirty
seconds as a warm-up time for the radio tubes.

2. Turn the function knob to the position where the arrow points to
the blue dot on the escutcheon.

3. Turn the large knob, or station selector, to the frequency position
of one of the local broadcasting stations.

,4. Turn the knob marked "VOLUME" slowly to the right until the sta-
tion is heard. Then readjust the large knob until reception is

5. Adjust "BASS" and "TREBLE" controls until the reproduction is most

To receive shortwave stations turn the function knob to the green or
yellow positions and proceed exactly as described.

(C)John F. Rider

Page 4:


The motor of the changer is permanently connected to
the 125 volt tap so that it will not be necessary to modify this for
various power line voltages. For 50 cycle operation a special drive
wheel is required and is available.


A fuse is provided for protection of the receiver against excessive
power line voltages and against failure of any component in the re-
ceiver which would cause heavy current drain and fire hazard. This
fuse is accessible at the rear panel of the tuner chassis. CAUTION:
Always replace the fuse with one of the same rating in the event the
fuse is blown. If the fuse continues to blow after replacement trouble
is indicated and the equipment should be removed from the cabinet for


The Model 515 has the following tube complement:

Symbol Tube Application Symbol Tube Application
V1 6BA6 RF Amplifier V7 63N7 2nd Audie Amplifier
V2 6C4 Converter V8 65N7 5rd Audio Amplifier
V6 604 Oscillator V9 6L6G Audio Power Output
V4 6BA6 IF Amplifier V10 6L6G Audio Power Output
V5 6BA6 IF Amplifier V11 SYSGT Rectifier
V6 6807 2nd Detector and lst V12 QSZGGT Rectifier

Audio Amplifier V13 65C7 Preamplifier, reluct-

ance pickup

Test Eguipment

1. Electronic type voltmeter for DC measurements - RCA Voltohmyst.

2. AM signal generator for 455 kc, 600 kc, lOOO kc, 1500 kc, 2 mc
6 mc, and 16 mc. '

5. AC voltmeter such as Ballantine Output Meter.

4. An aligning tool is included with each receiver and is taped on the
1st IF transformer can. Additional aligning tools may be ordered
under part number 94V4707.

Aliggment Procedure

The alignment is preferably performed in the following order: See
Figures l and 2 for location of adjustments on chassis.
1. 455 KC I.F. 3. Band 2 R.F.

'2. Band l R.F. 4. Band 3 R.F.

455 KC I.F. Alignment
A signal generator should be connected through a .01 MFD mica capacitor
to the junction of converter grid coupling capacitor (Cll) and middle
gang condenser section (C2) which can be found on band selector switch
(SW2). A good ground point for the generator is the rear support
bracket of the switch assembly.>

(C)John F. Rider

Page 5:


The AG voltmeter is connected across the secondary of the audio output
transformer, which is loaded with an 8 ohm 10 watt resistor connected

in place of the speaker voice coil. In the event this resistor is not
available the speaker may be used if the sound volume can be tolerated.
The volume, bass, and treble controls must be full on, the band selector
switch in Band l position, and the receiver dial set at 1600 kc.

Apply sufficient input signal at 455 kc 400 cycles 50% modulation to
give an indication of 2 volts r.m.s. AC on the AC output meter. With
the use of the aligning tool peak the primary (bottom core) and second-
ary (top core) of the 455 kc I.F. transformers for maximum reading on
the output meter. Begin alignment with peaking 5rd I.F. (T7), next the
2nd I.F. (T6) and last the lst I.F. (T5). As the I.F. stages approach
correct alignment, reduce the input signal level so the output never
exceeds 2 volts AC. Repeat above procedure if stages have been found
to be badly mis-aligned.

The normal 455 kc I.F. sensitivity is 5 uv for 10 db signal to noise
ratio with 400 cycles 50% modulation. An alternative method for deter-
mining sensitivity is to measure with the electronic voltmeter the DC
voltage applied to the AGC line (solid white wiring in tuner chassis).
With this method the 455 kc I.F. input is 15 uv for a reading of 1 V DC

Band 1 R.F. Alignment

Connect the signal generator to terminal l on the antenna terminal
strip through a .Ol MFD mica capacitor. The Band l loop antenna must
be plugged into the receiver. Operating controls and AC voltmeter con-
nections remain as for 455 kc I.F. alignment.

Set the signal generator and receiver dial at 1000 kc and adjust Band l
oscillator (T5) core for maximum indication on the output meter. Reset
generator and receiver dial at 600 kc and adjust Band l low frequency

trimmer (014). Reduce input signal so the output never exceeds 2 V A0.

The Band 1 converter transformer (T1) is now adjusted for maximum read-
ing. The signal generator and receiver dial are re-set to 1500 kc
and the Band 1 oscillator trimmer (058), Band 1 converter trimmer (C55)
and Band 1 loop trimmer (052) are adjusted. Repeak 055 and 052 if
considerable increase in output reading has been noted.

Normal sensitivity at any frequency on Band 1 is less than 0.5 uv for
10 db signal to noise ratio with 400 cycles 50% modulation.

Band 2 R.F. Alignment

Connect signal generator to terminal 2 on the antenna terminal strip
through a dummy antenna load of 100 ohms resistor in series with

125 MMFD capacitor. Operating controls setting and AC voltmeter con-
nections remain as for Band 1 R.F. alignment.

Set the signal generator and receiver dial at 2.2 mc and adjust in step
procedure Band 2 oscillator coil (T4) core, next Band 2 converter trans-
former (T2) core and Band 2 antenna coil (L2) for maximum reading on
output meter.

Reset signal generator and receiver dial at 5 mc and adjust in step pro
cedure Band 2 oscillator trimmer (059), Band 2 converter trimmer (056)
and Band 2 antenna trimmer (055). Repeat above procedure until no
further adjusting of cores and trimmers is needed.

Normal sensitivity at any frequency on Band 2 is less than 8 uv for
10 db signal to noise ratio with 400 cycles 30% modulation.

(C)John F. Rider

Page 6:










Model 515 Tuner Assembly

(C)John F. Rider

Page 7:



Band 5 R.F. Alignment

The signal generator connection through dummy antenna, AC output volt-
meter connections and operating controls setting remain as for Band 2

Set signal generator and receiver dial at 6 mc and adjust in step pro-
cedure Band 5 oscillator coil (L5) core, next Band 5 converter trans-
former (L4) core and Band 5 antenna coil (L5) core for maximum indica-
tion on output meter.

Reset the signal generator and receiver dial at 15 mc and adjust in
step procedure Band 5 oscillator trimmer (060), Band 3 converter trim-
mer (057), and Band 3 antenna trimmer (054).

Repeat above procedure until the 6 mc and 15 mc points require no fur-
ther adjusting of cores and trimmers. `

Normal sensitivity at any frequency on Band 5 is less than lO uv for
10 db signal to noise ratio with 400 cycles 50% modulation.

Location Of Tuning Adjustments

(C)John F. Rider

Page 8:


Tube Type Pin P?n P?n Pin P?n P?n P?n P?n
V1 SEAS -.5 O 6.5 0 120 120 1.25 -
Voltage readings made with Voltohmyst. Line voltage adjusted to
117 V AC. All voltages measured between indicated pin and chassis
frame. Unless noted all voltages are DC and positive to chassis.
No signal input.
Voltsges taken with the service selector switch in Band 1 position.
Volume control in the counterclockwise position.
Tone controls clockwise.

(C)John F. Rider

Page 9:



Tube Type Pin P?n P?n Pin P?n P?n Pin P?n
V5 GBAS O O 0 0 inf . inf . 220 -
V11 SYS ini` . inf . inf . 5 inf . 5 inf . inf .
V12 25Z6 im?` . inf . 2 inf . 2 inf . inf . inf .
Resistance readings taken with Voltohmyst connected between pin
indicated and chassis frame. Values given are in ohms except where
K indicates times 1000 and H indicates times 1 megohm.
A11 controls to the counterclockwise or off position.
Range switch in Band 1 position.

(C)John F. Rider

Page 10:


Parts List By Symbol Designation
3222;? Function Description Part No.
(Cl Main tuning capacitor Capacitor, variable, 5 gang 15W4895
C4 Grid coupling, RF Capacitor, mica 240 MMFD 15A566
05 Cathode bypass, RF Capacitor, paper, .05 MFD 15L5466
400 V, miniature tubular
06 Grid decoupling, RF Same as C5
CV Cathode bypass, RF Capacitor, ceramic 5000 MMFD 15L3462
08 Screen bypass, RF Capacitor, paper .O5 MFD 15L5467
600 V, miniature tubular
09 Screen bypass, RF Same as 07
010 Shunt capacity Capacitor, mica 10 MMFD 15E3207
Cll Grid coupling, Conv. Capacitor, ceramic 100 MMFD 15L5460
012 Grid decoupling, Conv. Same as 05
015 Cathode coupling,Conv. Capacitor, paper 5000 MMFD 15H2605
014 Variable padder, Capacitor, mica trimmer, 15E2675
Band 1, Osc. 50-200 MMFD
015 Fixed padder, Capacitor, mica 460 MMFD 15E1955
Band 1, osc. 10% soo v
016 Shunt capacity CQpacitor, ceramic 50 MMFD 15W4956
017 Fixed padder, Capacitor, mica 1000 MMFD 15A55
Band 2, csc. 20% 500 v
018 Fixed padder, Capacitor, mica 6200 MD 151-140
Band 5, osc. 20% 500 v
019 Grid coupling, Osc. Capacitor, ceramic 51 MMFD 15L5458
020 Plate decoupling, Osc. Capacitor, ceramic 1500 MMFD 15L6459
C21 Feedback coupling, Same as 013
Osc. plate
022 Plate decoupling, IF Same as 08
025 Grid decoupling, IF Same as 05
024 Plate decoupling, IF Same as CB
025 Plate decoupling, IF Same as CB
026 RF bypass, Diode Same as Cll
027 Bypass, AGC Capacitor, paper .1 MFD 1554298
200 V, miniature tubular
C2SA RF filter Capacitor, silver ceramic, 15D2925
028B RF filter 2x100 MMFD 20% 500 V, 5
wire leads
029 Audio input coupling Same as 05
C50 Grid coupling, Phono Same as 05
051 Grid coupling, Phono Same as 05
C52 Equalizing capacity Capacitor, paper .015 MTD 15L5464
400 V, miniature tubular

(C)John F. Rider

Page 11:


PAGE 22-1 1

Parts List By Symbol Designation
D222? Function Description Part No.
055 Coupling, Audio Amp. Capacitor, paper .1 MFD 15L5468
600 V, miniature tubular
054 Coupling, Audio Amp. Capacitor, paper .O2 MFD 15U4580
200 V, miniature tubular
C55 Grid coupling, Audio Capacitor, paper .01 MFD 15L5465
Amp; 200 V, miniature tubular
C56 RF filter, Audio Amp. Same as Cll '
057 Grid coupling, Audio Same as 055`
058 Bypass, Treble control Same as C55
059 Bypass, Treble control Same as 015
C40 Bypass, Bass control Same as 015
041 Bypass, Bass control Same as 054
C42A Decoupling Capacitor, electrolytic, 15L5588
042B Filter, low frequency 4x20 MFD, 450 V
C420 Filter, low frequency
C45 Cathode bypass, Audio Capacitor, electrolytic, 15B795
Amp. 25 MFD, 25 V, tubular
C44 Grid coupling, Audio Same as 08
045 Coupling. cathode Same as 05
C46 Shunt capacity Capacitor, mica 25 MMFD 15E1849
C47 Grid coupling, Audio Same as 08
C48 Grid coupling, Audio Same as 08
049 Cathode bypass, Power Capacitor, electrolytic 153656
Amp. 25 MTD, 50 V, tubular
050A Filter, low Voltage Capacitor, electrolytic, 15L5458
050B Filter, low voltage 2x60 MFD 200 V
051A Filter, high voltage Same as C42
C518 Filter, high voltage
0510 Filter, high voltage
052 Trimmer, Band 1 Ant. Capacitor, trimmer, 15W5079
055 Trimmer, Band 2 Ant. Same as C52
054 Trimmer, Band 5 Ant. Same as 052
055 Trimmer, Band l Conv. Same as 052
056 Trimmer, Band 2 Conv. Same as 052
C57 Trimmer, Band 5 Conv. Same as 052
058 Trimmer, Band 1 Osc. Same as 052
059 Trimmer, Band 2 Osc. Same as 052
060 Trimmer, Band 5 Osc. Same as 052
061 RF bypass, Audio Same as 020
E1 Dial light Lamp, 6-8 V .150 A #47 49A168
E2 Dial light Same as El
E5 Phono compt. light Same as E1
E4 Overload protection Fuse, 5 amp, 5 AG 57A162

(C)John F. Rider

Page 12:

PAGE 22-12


Parts List By Symbol Designation
gggggi Function Description Part No.
E5 Main tuning knob Knob, station selector 47V4605
1 7/8" dia. brass
E6 control knob Knob, 1 1/8" dia. black 4vv4eo4
bakelite, push-on type
E7 Align IF Aligning tool 94V4707
Jl Loop connector to Receptacle, 5 contact 67U4716
JZ Phono pickup, external Receptacle, dual, insulated 67V4657
audio sound connector
JS Phono compartment Receptacle, single, 67E3226
light connector insulated
J4 Power cable connector Socket, 12 contact 8284505
J5 Speaker connector Receptacle, 2 contact 67V4675
J6 Phono motor power Receptacle, 4 contact 67B645
L1 Signal interceptor Loop 1V4594
L2 Band 2 antenna tuning Coil 20W4915
L5 Band 3 antenna tuning Coil 20W4916
L4 Band 5 conv. tuning Transformer 20W4918
L5 Band 5 osc. tuning Coil 20W4920
L6 Filter choke, ripple Choke 17L3512
LSl Loudspeaker Speaker, 12" coaxial, PM 85V4595
B ohm voice coil
P1 Loop connector to Plug, 3 contact 65U4714
P2 Phono compartment Plug, single contact 65E5225
light connector
P5 Amplifier connector> Plug, 12 contact 6584301
to tuner
R1 Grid load, RF Resistor, com osition, 70L5404
.4'1 meg, 10% watt
R2 Grid decoupling, RF Resistor, composition, 70L3401
.1 meg, 10% ? watt
RS Cathode bias, RF Resistor, composition, 70L5591
82 ohms 5% e watt
R4 Plate decoupling, RF Resistor, composition, 70L3595
1000 ohms 10% 1; watt
R5 Grid load, Conv. Resistor, com osition, 70L5408
2.2 meg, 20% watt

(C)John F. Rider

Page 13:

Parts List By Symbol Designation
3222;? Function Description Part No.
R6 Grid decoupling, Conv. Same as R2
R7 Cathode bias, Conv. Resistor, composition, 7OL3595
4700 ohms, 10% t watt
R8 Plate decoupling,Conv. Same as R4
R9 Grid decoupling, IF Same as R2
R10 Grid load, Osc. Resistor, composition, 7OL5398
ss,ooo ohms, 10% t watt
Rll Plate load, Osc. Same as R4
R12 Cathode bias, IF Resistor, com osition, 7OV4785
220 ohms, 5% t watt
R15 Plate decoupling, IF Same as R4
R14 Cathode bias, IF Same as R12
R15 Plate decoupling, IF Resistor, composition, 70L5594
5300 ohms, 10% t watt
R16 Diode load, IF Resistor, composition, 70L5403
.22 meg 10% ? watt
R17 Diode decoupling, IF Resistor, composition, 7OL5399
47,000 ohms 10% ? watt
1 meg 20% ? watt
R19 Decoupling, Audio Resistor, composition, 7OL5397
22,000 ohms 10% t watt
R20 Power filter Resistor, 750 ohms, 10% v0w4912
Piokup 6800 ohms, 10% t watt
R22 Grid load, Phono Resistor, com osition, 70L3422
Proamplifior 5.5 msg, 20% 2 watt
R25 Plate load, Phono Resistor, composition, 7OL5515
Preamplifier ` 68,000 ohms,10% ? watt
R24 Plate load, Phono Same as R10
R25 Equalizing, Phono Same as R16
Audio Freq.
R26 Grid load, Phono Same as R22
R27 Equalizing, Phono Same as R19
Audio Freq.
R28 Volume control Potsntiometer, volume, 7OV4585
R29 Grid load, Audio Amp. Resistor, com osition, 70L5550
4.v meg, 20% watt
RSO Plate load, Audio Amp. Same as R2
R51 Tone control network Same as R17
R52 Treble control Potentiometer, treble, 7OV4584
R55 Bass control Potentiometer, bass off-on, 70V4585
R54 Bass control network Same as R19
R55 Grid load, Audio Amp. Same as R2
R56 Cathode follower Resistor, composition, 7OV4628
56 ohms,10% t watt

(C)John F. Rider

Page 14:


Parts List By Symbol Designation
gggggi Function Description Part No.
R37 Cathode bias, Audio Resistor, composition, 7OL5462
Amp. 2200 ohms, 10% ? watt
R58 Plate load, Audio Same as R17
R59 Cathode follower Resistor, composition, 7OL5527
decoupling 560 ohms, 10% ? watt
R40 Cathode circuit Resistor, composition, 70L5396
_ 10,000 ohms, 10% ? watt
R41 Cathode bias, Cathode Resistor, composition, 7OV47OO
Follower 1800 ohms, 10% ? watt
R42 Grid load, Cathode Same as Rl
R45 Plate decoupling, Same as R4
Audio Amp.
R44 Grid load, Phase Same as R16
Inverter .
R45 Cathode bias, Phase Resistor, composition, 70V4691
Inverter eao ohms, 10% 15 watt
R46 Cathode coupling Resistor, composition, 7OL5427
10,000 ohms, 10% 1 watt
R47 Plate load, Phase Same as R46
R48 Grid load, Power Amp. Same as Rl
R49 Grid load, Power Amp. Same as R1
R50 Cathode bias, Power Resistor, 167 ohms, 10% 70W4910
R51 Filter Resistor, 375 ohms, 10% 70W4911
R52 Filter Resistor, composition, 70V4693
:5900 ohms, 10% 2 watt
Swl Band l, 2, 5, Phono Switch, range, 4 position 89W4899
T1 Interstage coupling, Transformer 2074620
Band l Conv.
T2 Interstage coupling, Transformer 20W4917
Band 2 Conv.
T3 Oscillator, Band l Coil 2OV4621A
T4 Oscillator, Band 2 Coil 20W4919
T5 Interstage coupling,IF Transformer 20V4622A
T6 Interstage ooupling,IF Same as T5
T7 Interstage coupling,IF Same as T5
T8 Power Transformer 91W4900
T9 Output Transformer 91V4667

(C)John F. Rider

Page 15:


V1 RF Amplifier Tube - SBAG 92G28'11
V2 Converter Tube - 6_04 928597
V3 Oscillator Same as V2
V4 IF Amplifier Same as V1
V5 IF Amplifier Same as V1
V6 2nd detector, lst Tube - 6SQ7 92V4652
Audio Amp.
V7 2nd Audio Amp. Tube - SSN'I 92A250
V8 Phase Inverter Same as V7
V9 Audio Power Output Tube - 6L6G 92A255
V10 Audio Power Output Same as V9
V11 Low Voltage Tube - 25Z60'1' 92131419
V12 High voltage Tube - SYSGT 92B480
-N- V13 Phono Pickup Tube - SSC'I 92E4695
X1 Socket for V1 Socket, 'I contact, 825663
X2 Socket for V2 Socket, 'I contact,miniature 62V4636
mica filled bakelite
13 Socket for V5 Same as X2
X4 Socket for' V4 Same as X1
X5 Socket for V5 Same as Xl
X6 Socket for V6 Socket, 8 contact octal, 8234412
black bakelite, type MIPS
X7 Socket for V'7 Same as X6
X8 Socket for VB Socket, 6 contact octal, 82121522
X9 Socket for V9 Same as X8
X10 Socket for V10 Same as X8
X11 Socket for V11 Same as X8
X12 Socket for V12 Same as X8
X15 Socket for V15 Same as X6
'H- In some models GSL'T tube
is ubstinutea for the "5"" "L" 'L6
6307 tube 'ith changes ALL Rcslsrons '12W uNLEssNoTED 7 5 2 7 2 7 bi,ka
Figure 5 Schematic Diagram Model 515 Amplifier

? John F. Rider

Page 16:



(C)John F. Rider

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