Heathkit AA-151 User manual

STEREO APLIFIER
MODEL AA-15
1

RESISTOR AND CAPACITOR COLOR CODES
RESISTORS
The colored bands around the body of acolor coded resistor rep-
resent its value in ohms. These colored bands are grouped
toward one end of the resistor body. Starting with this end
of the resistor, the first band represents the first digit of
the resistance value; the second band represents the second
digit; the third band represents the number by which the first
two digits are multiplied. Afourth band of gold or silver rep-
resents atolerance of ±5% or ±10% respectively. The absence
of afourth band indicates atolerance of ±20%.
The physical size of acomposition resistor is related to its
wattage rating. Size increases progressively as the wattage
rating is increased. The diameters of 1/2 watt, 1watt and
2watt resistors are approximately 1/8”, 1/4” and 5/16",
respectively.
The color code chart and examples which follow provide the
information required to identify color coded resistors.
COLOR
BLACK -
BROWN -
RED
ORANGE
YELLOW
GREEN -
BLUE
VIOLET -
GRAY —
WHITE -
GOLD —
SILVER -
CODE
ST DIGIT 2nd DIGIT MULTIPLIER
0
l
z
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
I
10
100
1.000
10000
100.000
KOOO,000
—10.000.000
100.000.000
1000.000.000
.1
.01
TOLERANCE
GOLD ±5°7.
SILVER ±IO°7o
NO BAND ±20 °7
0
VIOLET-7
EXAMPLES
YELLOW- 447 x|,000
ORANGE-1,000-J (0R 47KO)
SILVER =TOLERANCE
±10 °70
RED-2
RED —
2
)22 x100,000
GREEN-100,000 J(oR 2.2 MEG.)
riTlwr^NO BAND TOLERANCE
±20 %
CAPACITORS
Generally, only mica and tubular ceramic capacitors, used
in modern equipment, are color coded. The color codes differ
somewhat among capacitor manufacturers, however the codes
shown below apply to practically all of the mica and tubular
ceramic capacitors that are in common use. These codes com-
ply with EIA (Electronics Industries Association) Standards.
MICA
COLOR CODE
IstPIGIT 2ndDIGIT MULTIPLIER TOLER °7o
BLACK—
BROWN —
RED
ORANGE-
YELLOW-
GREEN —
BLUE
VIOLET-
GRAY
—
WHITE —
GOLD
SILVER
~
0-
1-
2-
3-
4-
5-
6-
7-
6-
9-
0
1
2
3
4
5
6
7
6
9
I
10
-100
1000
10.000
-.01
±20
±2
±3
±5
±10
OBSERVE
DIRECTION OF
ARROW
WHT. OR
BLK. DOT
INDICATES
MICA
CHARACTERISTIC-
SEE NOTE IBELOW
(VALUE IN mjf— SEE NOTE 3BELOW)
EXAMPLE
27 X 100
\\I
RED VIOL RED
2,70 Ojjyf i5%
OR .0027 ufd
Place the
to right.
COLOR
TUBULAR CERAMIC
group of rings or dots to the left and read from left
CODE
1st DIGIT 2nd DIGIT MULTIPLIER
black-
brown -
RED
ORANGE-
YELLOW-
GREEN
BLUE
VIOLET
-
GRAY
WHITE —
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
I
10
—100
-1.000
10.000
TOLER.
TEMPERATURE
COEFFICIENT-
SEE NOTE 2
BELOW.
LESS OVLR 10
±20 ±20
±0.1 ±1
—
f
±2
—±2.5
±0.3 ±5
±0.25 —
±1.0 ±10
TEMPERATURE
COEFFICIENT-
SEE NOTE 2
BELOW
EXAMPLE
ORG ORG BLK GRN
14*;
33X1 ±5"X
33 uuf ±5%
(VALUE IN upf—SEE NOTE 3BELOW)
NOTES:
1. The characteristic of amica capacitor is the temper-
ature coefficient, drift capacitance and insulation resistance.
This information is not usually needed to identify acapacitor
but, if desired, it can be obtained by referring to EIA Stand-
ard, RS-153 (a Standard of Electronic Industries Association.)
2. The temperature coefficient of acapacitor is the predict-
able change in capacitance with temperature change and is
expressed in parts per million per degree centigrade. Refer
to EIA Standard, RS-198 (a Standard of Electronic Industries
Association.)
3.
The farad is the basic unit of capacitance, however cap-
acitor values are generally expressed in terms of pfd (micro-
farad, .000001 farad) and ppf (micro- micro-farad, .000001
pfd); therefore, 1,000 ppf =.001 pfd, 1,000,000 ppf =lpfd.
USING APLASTIC NUT STARTER
Aplastic nut starter offers a convenient method
of starting the most used sizes: 3/16" and 1/4”
(3-48 and 6-32). When the correct end is pushed
down over anut, the pliable tool conforms to the
shape of the nut and the nut is gently held while it
is being picked up and started on the screw. The
tool should only be used to start the nut.

TYPICAL COMPONENT TYPES
This chart is aguide to commonly used types of elec-
tronic components. The symbols and related illustra-
tions should prove helpful in identifying most parts and
reading the schematic diagrams.
RESISTOR
AVWV ^
POTENTIOMETER
(CONTROL)
—V\AM
—
t
CHASSIS GROUND NOT CONNECTED IELDED
CONNECTED 1tu

Assembly
and
Operation
of the
STEREO
AMPLIFIER
MODEL AA-151
HEATH COMPANY,
BENTON HARBOR,
MICHIGAN
TABLE OF CONTENTS
Specifications 2
Introduction 3
Circuit Description 4
Schematic 5*
Construction Notes 5
Parts List 6
Proper Soldering Techniques .8
Step-By-Step Procedure 10
Step-By-Step Assembly 11
Test And Connections 33
Final Assembly 35
Installation And Operation .35
In Case Of Difficulty 37
Service Information 38
Service 38
Replacements 39
Shipping Instructions 40
Warranty
Fold-out from page.
40
All prices are subject to change without notice. The Heath
Company reserves the right to discontinue instruments and
to change specifications at any time without incurring any
obligation to incorporate new features in instruments pre-
viously sold.
1
asubsidiary of
DAYSTROM, INCORPORATED Copyright 1961
Heath Company 10/12/62

SPECIFICATIONS
Page 2
Power Output
Rated Power (rms): ...
Peak Power:
Circuit:
Power Response:
Tone Controls
Bass:
Treble:
Maximum Harmonic Distortion (both channels at
full output).
30 cycles:. .
1kc:
15 kc:
Intermodulation Distortion (maximum):
(Using 60 cycle and 6kc signal mixed 4:1.)
Input Sensitivity
MAG. PHONO:
TUNER-AUX.:
XTAL:
Channel Separation:
Hum And Noise
MAG. PHONO:
XTAL-TUNER-AUX.:
Damping Factor:
Tube Complement:
14 watts per channel, 28 watts monophonic.
28 watts per channel, 56 watts monophonic.
Features Heath patented Ultra-Linear circuit,
U.S. Patent #2, 710, 312.
±1 db from 30 to 15,000 cps at 14 watt level.
19 db boost at 30 cps. 17 db cut at 30 cps.
13 db boost at 15,000 cps. 17dbcut at 15,000 cps.
2%.
*7%.
2%.
2%, both channels at full output.
.004 volt for 14 watts output.
Vt '*
'
.2 volt for 14 watts output.
.25 volt for 14 watts output.
Better than 35 db.
55 db or better below 14 watts.
65 db below 14 watts.
10.
2-6EU7
2-6AU6
2-6AN8
4-EL84/6BQ5
1-GZ34/5AR4

Page 3
Controls And Switches:
AC Receptacles:,
SOURCE Selector (MAG. PHONO, XTAL PHONO,
TUNER, AUX.)
VOLUME (dual-concentric with clutch).
BASS (dual-tandem).
TREBLE (dual-tandem).
MODE Selector (AMP LEFT, AMP RIGHT,
MONO LEFT SOURCE, MONO RIGHT SOURCE,
STEREO, and STEREO REV.)
POWER (ON-OFF).
SPKR. PHASE (NORM.-REV.)
FILAMENT BALANCE (LEFT CHANNEL and
RIGHT CHANNEL).
1-NORMAL (unswitched), 3amps maximum.
1-SWITCHED, 1amp maximum.
Power Supply:,
Power Requirements:
Transformer-operated full- wave rectifier.
117 volts AC, 50/60 cps, at 130 watts.
Dimensions
Overall: 5-1/4” high x15” wide x11” deep.
Clearance required for rear apron
connections: 1-1/4”.
Net Weight:, 25 lbs.
Shipping Weight:, 28 lbs.
Features patented Heath Ultra-Linear® circuit
U. S. Patent #2,710,312
INTRODUCTION
Your HEATHKIT Model AA-151 Stereo Ampli-
fier is, effectively, two high fidelity amplifiers,
two preamplifiers and apower supply, all con-
tained in asingle, attractively styled vinyl-
clad cabinet. Quality, versatility, styling, and
economy are the keynotes of the AA-151 design.
The use of two independent power amplifiers and
preamplifiers as asingle unit provides excellent
performance versatility, which could not be dup-
licated using separate amplifiers and preampli-
fiers occupying the same amount of space as the
AA-151. Either eight monophonic or four stereo
signal sources can be connected to the input jacks
of the AA-151. Each input source can then be
selected individually with the SOURCE selector
switch. The output level of the power ampli-
fiers may be set separately or simultaneously
with the clutched VOLUME control.

HEATMKIT b
Page 4DA
fiTROM
CIRCUIT DESCRIPTION
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LEFT CHANNEL PREAMPLIFIER
ai•)i*ii*MIiiiiit•»i iM11)iMivf
IUMII I1IMIHI iII l< Ml
LEFT CHANNEL POWER AMPLIFIER
h-
3
CL
z
:z
-z
:<
-i
:u
AUX
TUNER
XTAL PHONO
:“MAG. PHONO
y
t
VCW
y
6EU7
^I1I1III«fl IIIIIIIIII I IfIIIIIIiIIII*IIII| | I!IIII||IIIAIIIIIIII|I I 1IMIIIIII•IIIIIIIII4I I II*«II•IiXl1191 v1*114111 11 1*11•11
SOURCE
SELECTOR MC
SELE'
IDE 1
CTOR |
VI B1/2 6EU7 TONE CONTROL jV6 6AN6 V7 EL 84
V3 6AU6 NETWORK !1ve EL84 LEFT
"SPEAKER
i•11•i*1111m11*»11111 1 1 1 11111111»111111111111111*
£». I I IIIIIfII II«IIII1II•III III»1II I tI»I»II«»M«I4 I IIIIt I1(ItI•IiIII*IMt
-to
tHAUX
:o.
:z
=uJ TUNER
:z
:z
-<
E5XTAL PHONO
:h
:5
:gMAG. PHONO
-0£
RIGHT CHANNEL PREAMPLIFIER
t
CW V2B 1/2 6EU7
V4 6AU6 [TONE CONTROL
NETWORK
ll lIIIill 1IIIII I*Iit I I I I II IIII IIIt 11II II) II«IM1 I 1
»
RIGHT CHANNEL POWER AMPLIFIER
L| V5 6AN8 |—»|
V9 EL84
V10 EL84 RIGHT
SPEAKER
V2A 1/2 6EU7
11i11>t11111i•111 1 ii i •1111111r111iii i•i«i11111it1 1 1ii11•1 1 ii111
1
11111i1111«) 1111 i t1111111
»
it11ai1111it11•11»iii tiin1111i»11«iia1
1
«1 1 1m1111111i1 1 1111 < 11111111
1
«i
BLOCK DIAGRAM
The Model AA-151 Stereo Amplifier has three
basic sections; acommon power supply, the
left channel preamplifier and amplifier, and the
right channel preamplifier and amplifier.
The left and right channel preamplifier and
amplifier circuits are identical, therefore, only
the left channel and power supply circuits will
be discussed. For the purpose of this description,
assume that the SOURCE switch is in the MAG.
PHONO position and that the MODE selector
switch is in the LEFT AMPposition. We suggest
that you frequently refer to the Schematic and
Block Diagrams.
The audio signal presented to the MAG. PHONO
input is applied directly to the grid of tube VIA.
VIA is ahigh-gain, low-noise preamplifier stage.
The amplified signal is coupled from the plate
of VIA through capacitor C5 to the grid of VI B.
Resistors R9 and RIO, along with capacitors
C3, C4 and C6, provide RIAA equalization for
magnetic phono cartridges. VI Bis also ahigh-
gain preamplifier. The amplified signal from its
plate is coupled by capacitor C8 and the VOL-
UME control to the grid of V3.
V3 further increases the amplitude of the sig-
nal. The amplified signal from V3 is fed through
capacitor Cll to the packaged electronic tone
control network. This network consisting of sev-
eral resistors and capacitors, encapsulated in
an insulating material, operate in conjunction
with R20 and R23 to perform the BASS and
TREBLE control functions. The output signal of
the tone control network is applied through the
MODE switch to the grid of V6A.
The signal is again amplified by V6A and is
applied to the grid of V6B, the phase inverter
V6B does not amplify the signal, but applies
the signal in proper phase, to each tube (V7
and V8) in the push-pull amplifier output stage.
The signal from the push-pull output stage is
coupled through audio output transformer T1
to the left channel speaker system.
The power supply uses a5AR4 tube as afull-
wave rectifier. The filter network, consisting
of capacitors C25, C24, C23, and C22, and re-
sistors R36, R35, and R34, removes the 120
cycle ripple from the B+ voltage.

CONSTRUCTION NOTES
Page 5
This manual is supplied to assist you in every
way to complete your kit with the least possible
chance for error. The arrangement shown is
the result of extensive experimentation and
trial. If followed carefully, the result will be a
stable instrument, operating at ahigh degree
of dependability. We suggest that you retain the
manual in your files for future reference, both
in the use of the instrument and for its main-
tenance.
UNPACK THE KIT CAREFULLY AND CHECK
EACH PART AGAINST THE PARTS LIST. In so
doing, you will become acquainted with the parts.
Refer to the charts and other information on the
inside covers of the manual to help you identify
the components. If some shortage or parts
damage is found in checking the Parts List,
please read the Replacement section and sup-
ply the information called for therein. Include
all inspection slips in your letter to us.
Resistors generally have a tolerance rating of
10% unless otherwise stated in the Parts List.
Tolerances on capacitors are generally even
greater. Limits of +100% and -20% are common
for electrolytic capacitors.
We suggest that you do the following before work
is started:
1. Lay out all parts so that they are readily
available.
2. Provide yourself with good quality tools.
Basic tool requirements consist of ascrew-
driver with a1/4” blade; asmall screw-
driver with a 1/8” blade; long-nose pliers;
wire cutters, preferably separate diagonal
cutters; apen knife or atool for stripping
insulation from wires; asoldering iron (or
gun) and rosin core solder. Aset of nut
drivers and anut starter, while not neces-
sary, will aid extensively in construction of
the kit.
Most kit builders find it helpful to separate the
various parts into convenient categories. Muffin
tins or molded egg cartons make convenient
trays for small parts. Resistors and capaci-
tors may be placed with their lead ends in-
serted in the edge of apiece of corrugated
cardboard until they are needed. Values can
be written on the cardboard next to each
component. The illustration shows one method
that may be used.

PARTS LIST
Page 6
PART PARTS DESCRIPTION PART PARTS DESCRIPTION
No. Per Kit No. Per Kit
Resistors 4Capacitors (cont’dt)
1-9 41000 ft 1/2 watt 25-42 130-30 jutfd at 350 volts twist
(brown-black- red) prong electrolytic
1-13 42700 ft 1/2 watt 25-55 250 jufd at 10 volts miniature
(red-violet- red) electrolytic
1-22 522 Kft 1/2 watt 25-85 150 /ifd at 25 volts tubular
(red-red- orange) electrolytic
1-23 227 Kft 1/2 watt 25-101 160-25 /xfd at 500-450 volts
(red-violet- orange) twist-prong electrolytic
1-24 533 Kft 1/2 watt
(orange- orange- orange) Controls-Switches
1-88 436 Kft 1/2 watt 10-61 2200 ft tab- mount control
(orange-blue-orange) 12-34 11megohm dual-concentric
1-25 247 Kft 1/2 watt control
(yellow-violet- orange) 12-35 21megohm dual-tandem con-
1-26 5100 Kft 1/2 watt trol
(brown-black-yellow) 60-2 1DPDT slide switch
1-27 3150 Kft 1/2 watt 63-249 1AC switch
(brown-green-yellow) 63-258 14-position, single- section
1-29 4220 Kft 1/2 watt rotary switch
(red-red-yellow) 63-259 16-position, single- section
1-30 2270 Kft 1/2 watt rotary switch
(red-violet- yellow)
1-33 10 470 Kft 1/2 watt Transformers
(yellow-violet- yellow) 51-29 2Audio output
1-34 2680 Kft 1/2 watt 54-93 1
*r
Power
(blue -gray-yellow)
1-35 21megohm 1/2 watt
(brown-black-green) Terminal Strips-Sockets
1-37 22.2 megohm 1/2 watt 431-1 6Dual 1-lug terminal strip
(red- red-green) 431-2 22-lug terminal strip
4-2 2100 Kft 1/2 watt LOW-NOISE 431-3 33- lug terminal strip
(brown-black-yellow) 431-5 6 4- lug terminal strip
1A-2 11000 ft 1watt 431-13 14- lug screw type terminal
(brown-black-red) strip
IB-2 14700 ft 2watt 431-17 15- lug screw type terminal
(yellow-violet- red) strip
3G-9 1100 ft 7watt wire-wound 431-27 33-lug terminal strip
Capacitors 434-15 27-pin wafer tube socket
21-3 210 disc ceramic 434-16 49-pin wafer tube socket
21-7 633 jitjLLf disc ceramic 434-20 2AC socket
21-85 256 /Ltjuf disc ceramic 434-58 1Octal tube socket
21-39 2.0035 /ifd disc ceramic 434-68 49-pin molded tube socket
21-42 1.01 jufd disc ceramic 1.6 kv 434-76 2Triple phono socket
21-47 2.01 /ifd disc ceramic 434-82 1Double phono socket
21-82 1.02 /ifd disc ceramic
23-50 2.022 /ifd tubular Tubes- Lamp-Fuses
23-52 .2.047 /ifd tubular 411-11 26AU6 tube
23-61 4.05 /ifd tubular 411-68 26AN8 tube
23-28 8.1 /ifd tubular 411-108 4EL84 tube

PART
No. PARTS
Per Kit DESCRIPTION
Tubes-Lamps-Fuse (cont’d.)
411-136 1GZ34/5AR4
411-143 26EU7 tube
412-13 1Red neon pilot lamp
421-3 12-amp slow-blow fuse
Hardware
250-8 '16 #6 x3/8” sheet metal screw
250-10 46-32 x1/2” truss head ma-
chine screw
250-49 20 3-48 x1/4” screw
250-56 40 6-32 x1/4” screw
250-89 22 6-32 x3/8" screw
250-106 26-32 x3/8" self-tapping
screw
252-1 20 3-48 nut
252-3 64 6-32 nut
252-4 12 8-32 nut
252-7 6Control nut
252-32 1Push-on speednut
254-1 72 #6 lockwasher
254-2 12 #8 lockwasher
254-4 10 Control lockwasher
254-7 20 #3 lockwasher
255-1 21/8" spacer
259-11 1Spade lug
Wire-Knobs
89-1 1Line cord
340-1 1Length bus wire
341-1 1Length heavy black wire
343-6 1Length shielded audio cable
344-1 2Length hookup wire (light and
dark color)
346-1 1Length sleeving
347-9 1Length 3- conductor shielded
cable
462-117 1Small black knob 3/4" x5/8"
462-118 1Clear plastic knob l-i3/16”
x13/32"
PART PARTS
No. Per Kit DESCRIPTION
Wire- Knobs (cont’d.)
462-119 1Small black knob 3/4" x5/8"
for .187 diameter shaft
462-124 4Black and clear plastic
cascaded knob
Sheet Metal
90-M166 1
200-M296F469-470 Cabinet
1
203-M234F467 Chassis
1
203-M235F468-498 Control panel
1Front panel
203-M236 1Subpanel
204-M366 1Left front panel support
bracket
204-M367 1Right front panel support
bracket
205-
M296 1
206-
M176F471 Bottom plate
1Center shield
210-14 1Front bezel
Miscellaneous
75-20 1Insulated plate for double
phono socket
75-24 1Line cord strain relief
75-41 2Insulator for triple phono
socket
84-23 2Packaged Electronic Circuit
(P.E.C.) tone control net-
work
206-3 2Tube shield
206-55 2Tube base shield
261-17 4Plastic foot
391-11 1Nameplate
423-1 1Fuse holder
481-1 1Metal capacitor mounting
wafer
481-4 1Fiber capacitor mounting
wafer
331-6 Solder
595-421 1Manual

Page 8
PROPER SOLDERING TECHNIQUES
Only asmall percentage of HEATHKIT equip-
ment purchasers find it necessary to return an
instrument for factory service. Of these instru-
ments, by far the largest portion of malfunctions
are due to poor or improper soldering.
If terminals are bright and clean and free of wax,
frayed insulation and other foreign substances,
no difficulty will be experienced in soldering.
Correctly soldered connections are essential if
the performance engineered into akit is to be
fully realized. If you are abeginner with no
experience in soldering, ahalf hour’s practice
with some odd lengths of wire may be aworth-
while investment.
For most wiring, a30 to 100 watt iron or its
equivalent in asoldering gun is very satisfactory.
Alower wattage iron than this may not heat the
connection enough to flow the solder smoothly
over the joint. Keep the iron tip clean and bright
by wiping it from time to time with acloth,
CHASSIS WIRING AND SOLDERING
1. Unless otherwise indicated, all wire used
is the type with colored insulation (hookup
wire); the size of the conductor is the same
for all colors of hookup wires furnished with
this kit. In preparing alength of hookup wire,
1/4” of insulation should be removed from
each end unless directed otherwise in the
construction step.
2. To avoid breaking internal connections when
stripping insulation from the leads of trans-
formers or similar components, care should
be taken not to pull directly on the lead. In-
stead, hold the lead with pliers while it is
being stripped.
3. Leads on resistors, capacitors and similar
components are generally much longer than
they need to be to make the required con-
nections. In these cases, the leads should be
cut to proper length before the part is added
to the chassis. In general, the leads should
be just long enough to reach their termin-
ating points.
4. Wherever there is apossibility of bare leads
shorting to other parts or to the chassis, the
leads should be covered with insulating
sleeving. Where the use of sleeving is spe-
cifically intended, the phrase ”use sleeving”
is included in the associated construction
step. In any case where there is the pos-
sibility of an unintentional short circuit,
sleeving should be used. Extra sleeving is
provided for this purpose.
5. Crimp or bend the lead (or leads) around the
terminal to form agood joint without re-
lying on solder for physical strength. If
the wire is too large to allow bending or if
the step states that the wire is not to be
crimped, position the wire so that agood
solder connection can still be made.
6. Position the work, if possible, so that gravity
will help to keep the solder where you want
it.
7. Place aflat side of the soldering iron tip
against the joint to be soldered until it is
heated sufficiently to melt the solder.
8. Then place the solder against the heated
terminal and it will immediately flow over
the joint; use only enough solder to thor-
oughly wet the junction. It is usually not
necessary to fill the entire hole in the
terminal with solder.
9. Remove the solder and then the iron from
the completed junction. Use care not to move
the leads until the solder is solidified.
Apoor or cold solder joint will usually look
crystalline and have agrainy texture, or the
solder will stand up in a blob and will not have
adhered to the joint. Such joints should be re-
heated until the solder flows smoothly over the
entire junction. In some cases, it maybe neces-
sary to add alittle more solder to achieve a
smooth bright appearance.

HEATHKIT u
CRIMP WIRES HEAT CONNECTION APPLY SOLDER ALLOW SOLDER
TO FLOW
COLD SOLDER JOINT
CONNECTION INSUFFICIENTLY
HEATED
PROPER SOLDER
CONNECTION COLD SOLDER JOINT CONNECTION MOVED
WHILE COOLING
ROSIN CORE SOLDER HAS BEEN SUPPLIED WITH THIS KIT. THIS TYPE OF SOLDER
MUST BE USED FOR ALL SOLDERING IN THIS KIT. ALL GUARANTEES ARE VOIDED
AND WE WILL NOT REPAIR OR SERVICE EQUIPMENT IN WHICH ACID CORE SOLDER
OR PASTE FLUXES HAVE BEEN USED. IF ADDITIONAL SOLDER IS NEEDED, BE SURE
TO PURCHASE ROSIN CORE (60:40 or 50:50 TIN- LEADCONTENT) RADIO TYPE SOLDER.

Page 10 j
STEP-BY-STEP PROCEDURE
The following instructions are presented in a
logical step-by-step sequence to enable you to
complete your kit with the least possible con-
fusion. Be sure to read each step all the way
through before beginning the specified operation.
Also read several steps ahead of the actual step
being performed. This will familiarize you with
the relationship of the subsequent operations.
When the step is completed, check it off in the
space provided. This is particularly important
as it may prevent errors or omissions, espe-
cially if your work is interrupted. Some kit
builders have also found it helpful to mark each
lead in colored pencil on the Pictorial as it is
added.
The fold-out diagrams in this manual may be
removed and attached to the wall above your
working area; but, because they are an integral
part of the instructions, they should be returned
to the manual after the kit is completed.
In general, the illustrations in this manual
correspond to the actual configuration of the
kit; however, in some instances the illustra-
tions may be slightly distorted to facilitate
clearly showing all of the parts.
The abbreviation "NS” indicates that acon-
nection should not be soldered yet as other
wires will be added. When the last wire is
installed, the terminal should be soldered and
the abbreviation "S" is used to indicate this. Note
that anumber will appear after each solder
instruction. This number indicates the number of
leads that are supposed to be connected to the
terminal in point before it is soldered. For
example, if the instruction reads, "Connect a
lead to lug 1(S-2)," it will be understood that
there will be two leads connectedto the terminal
at the time it is soldered. (In cases where alead
passes through aterminal or lug and then con-
nects to another point, it will count as two leads,
one entering and one leaving the terminal.)
The steps directing the installation of resistors
include color codes to help identify the parts.
Also, if apart is identified by aletter-number
designation on the Schematic, its designation
will appear in the construction step which directs
its installation.

I£*
DAYSTROM Page 11
STEP-BY-STEP ASSEMBLY
Refer to Pictorial 1(fold-out from Page 15)
for the following steps,
NOTE: The phrase ”#6 hardware” means 6-32
x1/4” screws, #6 lockwashers, and 6-32 nuts.
Position the chassis as shown in Pictorial 1.
()Referring to Detail 1A, mount the octal
tube socket at location VI 1. Use #6 hard-
ware. Orient the keyway of the tube socket
as shown by the arrow in Pictorial 1.
Detail 1A
NOTE: When mounting wafer tube sockets, be
sure to mount each socket from the bottom of the
chassis. If, by mistake, the sockets are mounted
so the lugs pass through the chassis, they will
short to the chassis where they pass through the
mounting hole.
()Referring to Detail IB, mount 9-pin wafer
tube socket and shield bases at locations
VI and V2. Use 3-48 screws, #3 lockwashers,
and 3-48 nuts. Orient the blank space of
each tube socket as shown by the arrows in
Pictorial 1.
()Mount 9-pin wafer tube sockets at locations
V5 and V6. Use 3-48 screws, #3 lockwashers
and 3-48 nuts. Be sure to orient the blank
space as shown by the arrow in Pictorial 1.
()Mount 7-pin wafer tube sockets at locations
V3 and V4. Use 3-48 screws, #3 lockwashers,
and 3-48 nuts. Orient the blank space of
each tube socket as shown by the arrows in
Pictorial 1.
()Referring to Detail 1C, mount 9-pin molded
tube sockets at locations V7, V8, V9, and
V10. Use 3-48 screws, #3 lockwashers and
3-48 nuts. Be sure to orient the blank
spaces as shown by the arrows in Pictorial
1.
Detail 1C
()R69. Mount a 200 ft twist-tab control (#10-
61) at location J. Secure the control by
twisting each mounting tab 1/4 turn with
long-nose pliers. Refer to Detail ID.
Orient the lugs as shown in Pictorial 1.
CHASSIS TOP
()R70. Similarly, install a200 ft twist-tab
control (#10-61) at location K. Orient the
lugs as shown in Pictorial 1.
Detail IB

Page 12
()Referring to Detail IE, mount adual 1-lug
terminal strip at location A. Use #6 hard-
ware.
6-32 NUT
#6 LOCKWASHER
Detail IE
()Similarly mount dual 1-lug terminal strips
at locations B, C, S, andT. Use #6 hardware.
()Mount adual 1-lug and a4- lug terminal
strip at Mand L. Use a6-32 x3/8" screw,
#6 lockwashers, and a6-32 nut.
()Mount 4-lug terminal strips at locations
G, P, W, and XvUse #6 hardware.
()Mount 3-lug terminal strips at locations
H, N, and Q. Use #6 hardware. Refer to the
Parts Pictorial and Pictorial 1for identifi-
cation of the proper terminal strips.
()Referring to Detail IF, mount the fiber
electrolytic capacitor mounting wafer at lo-
cation E, and mount a3- lug terminal strip
at location Fon one of the mounting screws.
Use a6-32 x3/8" screw, #6 lockwashers
and a6-32 nut for the double mounting. Use
#6 hardware for the other mounting hole.
Refer to Pictorial 1for proper orientation
of the capacitor lug markings.
()C22, C23. Mount the 30-30 pfd electrolytic
capacitor at location E. Secure the capac-
itor by twisting each mounting lug 1/4
turn with long-nose pliers. Refer to Pic-
torial 1for proper orientation of the ca-
pacitor lug markings.
6-32 NUT
«6 LOCKWASHER
WHILE HOLDING THE
CAPACITOR IN PLACE,TWIST
EACH OF ITS MOUNTING
LUGS APPROXIMATELY
1/A TURN.
INSTALL THE CAPACITOR
MOUNTING WAFER ON
THE CHASSIS.
-32X3
/8" SCREW
ORIENT THE CAPACITOR
LUG MARKINGS AS SHOWN
IN THE PICTORIAL, THEN
PUSH THE CAPACITOR INTO
THE WAFER.
LUG MARKINGS
i
Detail IF
()Mount 2-lug terminal strips at locations R
and U. Use #6 hardware.
()Similarly, mount the metal electrolytic
capacitor mounting wafer at location D.
Use #6 hardware.
()C24, C23. Mount the 60-25 pfd electrolytic
capacitor (#25-101) at location D. Secure the
capacitor by twisting each mounting lug 1/4
turn with long-nose pliers. Refer to Pic-
torial 1for proper orientation of the ca-
pacitor lug markings.

Page 13
Cut the leads of the power transformer (#54-
93) to the following lengths (measured from the
exit of the transformer).
COLOR
()Green
()Green
()Blue
()Blue
()Red-yellow
()Long black
()Black"
()Red
( ) Red
()Yellow
()Yellow
LENGTH
3-1/2’
3-1/4’
2-1/2”
Do not cut these leads
as they are of proper
length.
()Strip 1/4” of insulation from the end of
each lead and ’’tin.” (Tin means to melt
asmall amount of solder on the exposed
wire ends.)
Cut the leads of either output transformer
(#51-29) as follows:
COLOR
()Brown
()Orange
()Yellow
()Black
()Red
()Blue
()Green
LENGTH
3-1/2”
(JBlue-yellow 2-1/2”
()Green-yellow 2”
()Strip 1/4" of insulation from the end of
each lead and tin.
Cut the leads of the remaining output trans-
former (#51-29) as follows:
COLOR
()Yellow
()Orange
()Brown
( ) Black
()Green-yellow
()Blue-yellow
()Blue
()Green
()Red
LENGTH
3-1/2"
2-
3/4”
1-3/4”
3-
3/4”
3-1/2”
2-1/2’
Do not cut
2-1/2"
2-1/2”
()Strip 1/4" of insulation from the end of
each lead and tin.
()Mark this transformer as T1 so that it
can be identified in the following steps.
()Tl. Mount output transformer T1 as shown
in Pictorial 1. The black, brown, orange,
and yellow leads should be toward the rear
apron of the chassis. Secure the trans-
former with #8 lockwashers and 8-32 nuts.
()T2. Similarly, mount the other output trans-
former at T2. Again place the transformer
with its black, brown, orange, and yellow
leads toward the rear apron of the chassis.
Use #8 lockwashers and 8-32 nuts to secure
the transformer.
()T3. Mount the power transformer on the
chassis at T3 as shown. Use #8 lockwashers
and 8-32 nuts to secure the transformer.

Page 14 DAYSTROM
Detail 1G
()Referring to Detail 1G, mount an AC socket
at location BA. Use #6 hardware. Bend the
two lugs of the socket at 90 degree angles
as shown in Pictorial 1.
()Similarly, mount the remaining AC socket
at location BB. Bend the two lugs at 90
degree angles as shown in Pictorial 1.
()Referring to Detail 1H, mount the fuse
holder at location BC. Use the hardware
supplied with the fuse holder. Bend lug 1
away from the fuse holder body and orient
the fuse holder as shown in Pictorial 1.
()Referring to Detail 1J, mount the 5-lug
screw type terminal strip at location BD.
Use #6 hardware to secure one end of this
terminal strip. At the other end a6-32 x
1/4” screw should be placed through the
terminal strip, the rear apron of the chas-
sis, and then into slide switch BE.
6-32 NUT
Detail 1J
()Similarly, mount the 4-lug screw type
terminal at location BF. Again #6 hard-
ware should be used to secure one end of
the terminal strip. A6-32 x1/4” screw
should be placed through the other end of
the terminal strip, through the rear apron,
and then into slide switch BE.
{)Referring to Detail IK, mount adouble
phono socket and insulator at location BG.
Use 6-32 x3/8” screws, #6 lockwashers,
and 6-32 nuts.
()Install a#6 sheet metal screw in each side
of the chassis, near the front edge, as
ohown in Pictorial 1.
()Locate the subpanel and, referring to De-
tail 1L, mount the AC switch (#63-249) and
the subpanel at location FF. Use acontrol
nut. Do not tighten yet.

DAYSTROM
=1 Page 15
DetaU 1L
()Secure the other end of the subpanel to the
chassis with a6-32 x3/8" screw, #6 lock-
washer, and a6-32 nut. Now tighten the
control nut on FF.
NOTE: In cases where alead passes through a
terminal or lug and then connects to another
point, it will count as two leads, one entering
and one leaving the terminal.
()Locate the heavy bus wire, straighten it to
remove the kinks, and pass one end through
lug 4of terminal strip P(NS), through the
center hole in dual 1-lug terminal strip S
(NS), and through the center hole in dual 1-
lug terminal strip T(S-l). Now solder the
connection at terminal strip S(S-2). Cut
off excess lengths at terminal strip P.
Refer to Pictorial 2(on Page 17) for the following
steps.
()Turn the chassis over and mount a3-lug
terminal strip at location Y. Use #6 hard-
ware.
()Referring to Detail 2A, mount the front panel
to the main chassis. Secure the front panel
with #6 hardware.
()Referring to Detail 2B, mount the MODE
selector switch (#63-259) at location FA.
Use two control lockwashers and acon-
trol nut. Turn the switch shaft fully clock-
wise and position the lugs as shown in
Pictorial 2. Use aknob for proper indexing.
()R23, R59. Mount adual-tandem control
(#12-35) at location FB. Use two control
lockwashers, and acontrol nut. Orient
the lugs as shown in Pictorial 2.
()R20, R55. Similarly, mount another dual-
tandem control (#12-35) at location FC. Or-
ient the lugs as shown in Pictorial 2. Use
two control lockwashers, and acontrol nut.
CONTROL NUT
Detail 2B
()R15,R51. Temporarily mount adual-con-
centric control (#12-34) at location FD. Or-
ient the control lugs as shown in Pictorial 2.
Use two control lockwashers and acontrol
nut.
()Mount the Input Selector switch (#63-258) at
location FE. Use two control lockwashers
and acontrol nut. The flat of the shaft should
be oriented so that it is exactly opposite
the MAG. PHONO position printed on the
front panel, when turnedfully counterclock-
wise, Use aknob for proper indexing.
NOTE: The purpose of using twisted pairs of
hookup wire is to provide shielding for signal
carrying leads and cancellation of hum in the
filament and AC leads. Best results will be ob-
tained in the following steps if the wires are
twisted approximately three complete turns
per inch. See Detail 2C. The wires may be
twisted by hand or with adrill as shown in
Detail 2D on Page 16. If adrill is used be care-
ful not to twist the wires too tightly.
Detail 2C

Page 16
a. ^
Detail 2D
( ) Take 20 feet of the light hookup wire and 20
feet of the dark hookup wire. Referring to
Details 2C and 2D twist these two wires
together.
NOTE: When making aconnection with hookup
wire, 1/4Mof insulation should be removed,
unless directed otherwise in the step,
()At one end of a4-1/2" twisted pair, con-
nect the light wire to lug 7(NS) and the
dark wire to double-lug 1(NS) of switch FA.
()At the other end of this twisted pair, con-
nect the light colored wire to lug 2of
control FB (NS). The dark wire serves as
ashield and is not connected at this end.
()At one end of another 4-1/2" twistedpair,
connect the light wire to lug 6(NS), and
the dark wire to lug 1(NS) of FA.
()At the other end of this twisted pair, con-
nect the light wire to lug 5of control FB
(NS). The dark wire is not used at this end.
()At one end of a7" twisted pair, connect the
light wire to lug 3(S-l) and the dark wire to
lug 1(NS) of switch FA. Place the free end
of this twisted pair through holeHBnearVS
in the chassis. This end will be connected
later.
()At one end of a6-1/4" twisted pair con-
nect the light wire to lug 5(S- 1)and the
dark wire to lug 1(S-4) of switch FA. Place
the free end of this twisted pair through
hole HA in the chassis. It will be con-
nected later.
NOTE; Either light or dark hookup wire may be
used for point-to-point wiring in the following
steps.
()Connect a3" length of hookup wire between
lugs 2(S-l) and 7(S-2) of switch FA.
(,) Connect a1-1/2" length of hookup wire be-
tween lugs 4(S-l) and 6(S-2) of switch FA.
( ) Connect one end of a3-1/2" hookup wire to
lug 1of terminal strip Y(NS). Place the
free end of this wire through hole HAin the
chassis. It will be connected later.
NOTE:When installing
the tubular capacitors,
be sure that the end
marked with aband or
shoulder is placed as
shown in Pictorial 2.
()C34, Cut the lead from the unmarked end
of a.047 p.fd tubular capacitor to 3/4". Con-
nect this lead to lug 2of terminal strip Y
(NS). Place the free lead of this capacitor
through hole HC in the chassis. It will be
connected later. Use sleeving on the lead
passing through the chassis hole.
()C9. Cut the lead from the unmarked end
of a.047 ^fd tubular capacitor to 1/2".
Connect this lead to lug 3of terminal
strip Y(NS). Cut the marked lead to 1-1/4"
and place this lead through hole HD in the
chassis. It will be connected later. Use
sleeving on the lead passing through the
hole near the tube socket.
()Referring to Detail 2E, cut the leads of both
P.E.C. networks (#84-23). Detail 2E is full
size and can be used as atemplate. Place
sleeving over each lead and connect one
prepared P.E.C as follows:

FULL SIZE
Detail 2E
LEAD NO. CONNECT TO
()1lug 3of terminal strip Y(S-2)
()2lug 3of control FC (S-l)
()3lug 3of control FB (S-l)
()4lug 2of control FC (S-l)
( ) 5lug 1of control FC (S-l)
()6lug 2of control FB (S-2)
()7lug 1of control FB (S-l)
()8lug lof terminal strip Y(NS)
()At one end of a6-1/2” twistedpair, con-
nect the light wire to lug 3of control FD
(S-l). Connect the dark wire through lug 1
(NS) to lug 4(NS) of control FD. Place
the free end of this twisted pair through
hole HN in the chassis. It will be connected
later.
()At one end of a4-1/2” twistedpair, connect
the light wire to lug 2(S-l) and the dark wire
to lugl (NS) of control FD. Place the free end
of this twisted pair through hole HE in the
chassis. It will be connected later.
()Connect a3” length of hookup wire from lug
1of control FD (S-4) to lug 9of switch FE
(NS).
()Connect a3” hookup wire between lugs 9
(NS) and 3(NS) of switch FE.
()At one end of a4” twisted pair, connect the
light wire to double-lug 8of switch FE (S-l).
The dark wire is not connected at this end.
Place the free end of this twisted pair through
hole HH in the chassis. It will be connected
later.
()At one end of a5” twisted pair, connect
the light wire to double-lug 2of switch FE
(S-l). Connect the dark wire to lug 3of
switch FE (NS). Place the free end of this
twisted pair through hole HL in the chas-
sis. It will be connected later.
( ) C31. Connect the lead from the marked end
of a.1 jiifd tubular capacitor to lug 4of
switch FE (S-l). Place the free lead of this
capacitor through hole HG in the chassis.
It will be connected later. Use sleeving on
both leads.
()C6. Connect the lead from the marked end
of another .1 jLtfd tubular capacitor to lug
10 of switch FE (S-l). Cut the other lead to
3/4” and place it through hole HM in the
chassis. It will be connected later. Use
sleeving on both leads.