DYNACO Dynakit ST35 User Manual

If hum and nol.", are present to :my unusual clE'!:;n,<".iir~t
remove the input plugs from tlw St<'rC'o :3;;, and rcp!:lcC
them with short-circuited input plugs I or t<~mp()rarily con-
nect a jumper betwcn eyelets 1 ;md :2 on each circuit
board). If the hum and noise become virtually inaudible,
the amplifier is probably working properly, and the cause
should be sought elsf~wh(~re in the system. Tf plainly audibll"'
hum or noise p<'rsist. there may be an error or defpctive
component in the pow('r supply, or an open ground con-
nection. If the hum is in one chanrwl of the :1mplitier only,
chC'ck to see that eyelet -:;'2 of its circuit board is soldered
to the input ground lug. Occa.sionally. u had tubC' will cause
this condition, which is easily detertflined by switching
tubes until the hum appears in the opposite channel. Hum
on both channels is probably dl1(~ to .'1 pOWN supply dd(~d,
a bad capacitor section or defective diode.
FACTORY SERVICE AND WARRANTY
The Stereo 3.'i is designed to provide reliable, trouble-
free performance for a long period of time. when properly
ass,~mbled and installed. It is intendpd for use with the
l~O-volt ;1.C. power supplied to most homes. Although varia-
tions of severnl volts abovp or below this figure will have no
pronounc0d et1""d upon lwrformanc/' or comronent life, th('
normal guarantr·c on the equipment is not applicable if it
is operated with a.c. inputs gre.'1ter than 1:30 volts. If yom
local pow('~r is this high or higher in voltage, it is suggested
that a voltage rt"g'ulating or adjusting device be installed
to protect the amplifiC'l".
All parts used in the Stereo 35 ill'(' guaranteed for a
period of one yea r from the cia te of purchase except tul)(',;,
which carry the standard P]cctronic industry (EYA) 90-thy
warranty. Defective parts will be replaced at no charge if
they arc returned prepaid to the factory either directly or
via the dealer from whom the kit was purchnsed. Mnny
Dynakit dealers carry parts in stock which may be used
for replacC'ments. 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
SlI pply storc.
H it is lwliev('d that a transformer is ddective, it should
be disconnected by un~oldE'l'ing, never by cutting its leads
so short that it cannot be re-w;ed.
If the kit has been completely assembled, yet cannot be
made to function properly, or if difficulty is apparent after
a short pNiod of use, W0 will service the kit for a fixed
charge of S6.00, plus the cost of the pmts which al'<~ outside
the warranty aI' have b('('n damaged by the user.
Factory assembled amplifiers include a One-year war-
ranty on labor as well as parts.
!lllermiUt'llt hum, noi.,,' or ..,11/,lIce :H0. usually the result
of ;\ poor solder conn<,ction. If the trouhlp occur~ in both
ch311nl'l::i. check the powpr supply first; if in one channel
alon/'. 0x:1minf' tll(' soldN conn/'ctions on that sidf'.
Fibment glow is normal. hut if the platf' I the' largC'
metal area) of a tube tends to glow rpd, either the tube or
its a.ssoci.'lt('rl circuitry is faulty. If :111 four of Ih(' output
tubes glow in this mannl~r. there is a short circuit in eitlwr
thp cathocj,~ (pin ;;::1 of :ll1Y 6Bq;5) OJ' filamcllt (pins ;:;4
:1l1d ;;:-;». or at lug #4 of the filter c3[J:lcitor.
Th<' voltage chart printed alongside the: schf'matic dia ..
g'r!llll may be helpful in trouhle-shooting. If readings made
at :3l1Y of the points indicated differ from those list('d by
more than lOU;), it is Ekdy that a wiring error or defective
COlllpOnf'nt is nearby in the circuit.
The Stprco :3::5 should never 1)(' opcr3ted with :my of its
tubes relllOvcd from their sockets.
I~1PORT"'\NT: FIXED-CHARGE SERVICE AND
MAINTENANCE ARE NOT AV AILABLE FOR
KITS WHICH ARE INCOMPLETELY WIRED,
OR KITS WIRED WITH SOLDER OTHEH THAN
HOSIN CORE TYPE, OR KITS PHYSICALLY
OR ELECTRICALLY MODIFIED WITHOUT
PRIOR FACTORY AUTHORIZATION. ADDI-
TIONALLY, NO PARTS WILL BE HEPLACED
AND 1\'0 SERVICE MADE AVAILABLE FOR
KITS FOR WHICH THE WARRANTY POST
CARD HAS NOT 8EEN HETURNED. THE
SERIAL NUMBER ON THE FRONT COVER OF
THIS INSTRUCTION BOOK MUST BE MEN-
TIONED IN ALL CORRESPONDENCE .AND IN
ANY CASE WHEHE PARTS ARE RETURNED.
OR KITS SENT OR BROUGHT TO THE FAC-
TORY FOR SERVICE.
It is the factory prerogative to limit til(' service facility
to one year from the dat0 of purchase.
When shipping th0 amplifier to Dynaco, Inc., for servic0,
attach a note specifying the symptoms, th<' name and
address of the sencl('r. ;md the scri:d number of the kit.
The kit ~houlcI be securely packed to withstnnd the abuses
of handling in transit. It should lw placed in a rugged car-
ton surrounded by seven11 inches of shrcdd(~d paper or
other soft packing material. The original bl car/on i~ nol
suitable for shipment of a wirl~d amplifier.
Shipment should be made by prepaid EXPRESS, where
possible; repaired kits will then be rC'turned EXPRESS
C.O.D. for freight and service chargf's (unless these charges
have b('cn prepaid). Parcel post is not u safe method for
the shipment of ass('mblcd kits. and should not be used
for this purpose.
The Dyna Company c:ssumes no linbility or responsibility
for damages or injuries sLlstained in assembly or operation
of this Dynakit.
"
PARTS LIST
Ports of sll11ilar type which do not change performar~ce will sO;l~·:til11r., be incillot:d ,1, ,1
:nalter of expediency. This Will account for slight variations :n v;iue and appeoran:",
Part ~o.
711036
71 !O37
I1l038
46477Jj
tl5456S
SI700S
517006
5t1/1529
Chassis
Cover
Bolto'n plate
I Power transformer PA·774
2 Output trJnsformer Z·565
4 Output tube 6805/[L84/7189
2 Driver t1:be 72·17
2 Recrifir:r diodl~ SOO l11a 1000 piv
I Filter capilci(or. quzdruple section
50,'1020 @ tl50 v.; lOO @ 25 v. 297227
2 Circuit board assembly PC·13 557013
4 Socket. 9 pin saddle 399010
Terminal strip. 3 screw
T~rminJI strip, 5 lug
Input sockd
line cord
Wire. hookup
Warranty card
RESISTORS
I 50 ohms, 5wiltts
I 95 ohms. 5 watts
I 6,800 ohms [blue, grJy. red)
Part ~o.
373003
375001
hiOOl
322092
'20500
120950
114682
HARDWARE ENVElOPE
root. (':bller
Fuse, ~ .lmpere ,:u ';i~
Fw.o ho'r.cr W:tll I:ar'!'lii!rc
Gfe·;nlllct, :-,jj)b,~';', :,)"
2') L:'C,W.1S;Ii'~, ;;·1
. 0 Loc<w.:q·,:, ,,8
2S ~lil, i1U~gOlill .. (!·!:iO
") I~U c. hexagon:Ji. ,,~]?
25 Screw, r:l,lchll~e, ~'/I·:l::, X Ill"
12 Scrr:w. IIl.'1clline. #83? x J/~"
4 Sue"N, 51':ed ,1'.1'1,1[, ';'0
Part No.
35YL,(;?
3120)0
341,-,:.;:
:..;'j50C3
617:'05
517405
614215
51·\·:G "
51l?15
o 114(i<)
61236~
11

DYNACO Dynakit ST35 Specifications

General

Brand	DYNACO
Model	Dynakit ST35
Category	Amplifier
Language	English