Specifications

FACTORY SERVICE AND WARRANTY
The SCA-35 is designed to provide reliable, trouble-free
perfonnance for a long period of time, when properly
assembled and installed. It is intended for use with the
120-volt AC power supplied to most homes. Although vari-
ations of several volts above or below this figure will have
no pronounced effect upon performance or component life,
the nonnal guarantee on the equipment is not applicable
if it is operated with AC inputs greater than 130 volts. If
your local power is this high or higher in voltage, it is
suggested that a voltage regulating or adjusting device be
installed to protect the amplifier.
All
parts used in the SCA-35 are guaranteed for a period
of one year from the date of purchase except tubes, which
carry the standard electronic industry (EIA) gO-day war-
ranty. Defective parts will be replaced at no charge if they
are returned prepaid to the factory either directly or via
the dealer from whom the kit was purchased. After the
guarantee period has passed, DYNACO, Inc. will supply
any non-standard parts used at net prices. Parts which are
standard (resistors, capacitors, tubes) can generally be
purchased from a local electronics supply store.
n it is believed that a transfonner is defective, it should
be disconnected by unsoldering, never by cutting its leads
so short that it cannot be re-used. Warranties on the trans-
formers are void
if the leads are cut too sJwrt for re-use.
If the kit has been completely assembled, yet cannot be
made to function properly, or if difficulty is apparent after
a short period of use, we will service the kit for a fixed
charge of $10.00, plus the cost of the parts which are out-
side the warranty or have been damaged by the user.
Factory assembled amplifiers include a one-year war-
ranty on labor as well as parts.
Fixed-charge service and maintenance are not available
for kits which are incompletely wired or kits wired with
solder other than rosin core type, or kits physically or
electrically modified without prior factory authorization.
The serial number on the front cover of this instruction
book must be mentioned in all correspondence and in any
case where parts are returned, or kits sent or brought to
the factory for service.
It is the factory prerogative to limit the service facility
to
one year from the date of purchase.
When shipping the amplifier to DYNACO, Inc., for
service,
attach a note specifying the symptoms, the name
and address of the sender, and the serial number of the
kit. The kit should be securely packed to withstand the
abuses of handling in transit. The front plate should be
protected with a plastic or wax paper covering, or it may be
removed. The unit should be placed in a rugged carton sur-
rounded by several inches of shredded paper or other soft
packing material. The original carton in which the ampli-
fier is supplied is suitable for shipping if the original inserts
are properly used.
Shipment should be made by prepaid EXPRESS, where
possible; repaired kits will then be returned EXPRESS
C.O.n. for freight and service charges (unless these
charges have been prepaid). PARCEL POST IS NOT A SAFE
METHOD FOR THE SHIPMENT OF ASSEMBLED KITS, AND SHOULD
NOT BE USED FOR THIS PURPOSE.
The DYNA Company assumes no liability or responsi-
bility for damages or injuries sustained in assembly or
operation of the Dynakit.
PARTS LIST
Parts of similar type which do not change performance may sometimes be included
as a matter
of expediency. This will account for slight variations in va,lue or appearance.
Capac/for.
~2 n! (.02 mid) 10% - C15, C16
'9-"10 n! (.01 mid) 10% - Cll, C12
...... 3.3 n! (.0033 mid) 10% - C5, CI0, C13, C14
oJ...-'.02 mid 500V disc - C22
YTwo-section filter capacitor, 50/50 @ 450V - C23
J...- Four·section filter capacitor, 6Oj40nO @ 450V; 100 @ 25V - C24
Reslsfors
1¥""50 ohms, 5 watts, 10% - R41
~ 95 ohms, 5 watts, 5% - R42
0. 2200 ohms (red-re<!-red), 1 watt, 20% - R39, R40
IV 10,000 ohms (brown-black-orange), 'hW, 10% - R25, R26
,jl- 18,000 ohms (brown-gray-orange). '/2 W, 10% - R27, R28
J- 22,000 ohms (red·re<!-orange), lhW, 10% - R38
.%' 1.5 megohms (brown·green-green), %W, 10% - R12, R24
Hardware
57 #4 Machine screws
49 #4 Nuts
49 #4 Lockwasbers
.
4 #6 Machine screws
4 #6 Nuts
~ #6 Sheet metsl screws
12
#8 Machine screws
12
#8 Nuts
12 #8 Lockwashers
111': %" Control mounting nuts
i(' %" Lockwashers
"f" Ground lug
k' Pilot light jewel
.. Pilot light jewel spring
'lY"Rubber grommet
l'" Cable clamp
#I' Rubber feet
_.L
CDnfrols
,y Selector switch - 134601
V Volume control-177254
J,.. Balance control - 167754
.v Bass control - 167205
IV Treble oontrol - 167504
12"" Hum oontrol - 147102
fY DPDT slide switch (six lugs)
Y"SPST slide switch (two lugs)
.... Fuse holder with rubber washer and circular nut
or' Fuse, 2 ampere, Slo·Blo
8" PEC tone control circuit module (7 leads) - 555002
.t'" PEC input circuit module (5 leads) - 555003
.:.Y Silicon rectifier, 500 rna 1000 PIV
~ Mounting wafers for filter capacitors
\l.o Pilot light socket
~ Pilot lamp #47
'" AC outlet
.....·4 socket input socket strip
~ 4 screw terminal strip
IY 5 lug terminal strip
.. 9 pin tube socket
~ Hookup wire (I each red, green, black)
"" Flat 4-conductor cable
~Irisulating sleeving (black) r
u,... Line cord with plug
Y'Chassis assembly (5 pieces)
",",PA-774 power transformer
Q' Z-565 output transformer
,z..--PC-I0 circuit board assembly
~ PC-ll circuit board assembly
yOutput tube 6BQ5/EI.r84/7189 (matched)
e-- Driver tube 7199
02" Preamplliler tube 12AX7 jECC-83
• Large knob
'8 Small kn.ob
\l/ Front panel
-r Instruction manual with pictorial diagrams
.):- Warranty card
21