Instruction manual

mechanical In.hlilation
GENERAL
0) HEAT DISSIPATION (VENTILATION), Ineemecnwlth
,9ther electronic equipment; the Model HF-14prbduees a
gr8c;rt deal ofhed I" normal operation. Unle .. conttn~
uous and adequate air- flow I, obtained around the heat
pr'Oducfngelements,these. elementswill overheat andtheir
usefulllfewlUbegreatlycurtalled. Adequateventllation
will be provided I' the ampllfler·I, JrlItOlledln CIl open-
backconsoleprovlded,that the topafthe ~ltfJer Ii spac-
ed at lealt two Inchel'belbw any ,h.lf mounted aboVe it.
if the cabinet is enci~ed at the rear, provide several large
hoI
.. or slots eli low clown and as 'high'up In the cabinet
back
CIS poalble. AI ~ altemate, hoi. may be provided
In the sid., bottom,or top of the cabinet. Thelmportant
thing to remember Is that effective ventJlatlon requires
provisionfor cool oir to eriter at the bottom and to leave
at the top. . ._.
If the ampUfier Is not Installed In a console, It should be
situated preferably on. an open surface. An attractively
ftni.hed matchIng cover forthe Mod.1 HF ... 14 is available
which will provide a "flnllhed
lt
appearance as well CIt
protection when the amplifier itnotlnstalled In a console.
Four rubber feet are also provIded 10 that the amplifier
will not mar the suri'ace of fumiture on which it is placed.
b) ACCESSIBILITY TO PARTS: Tubes are tho moot fre-
quently replaced Items In electronic equipment. If the
amplifier II placed in a console, sufficient space should
be
allotted to reach and remove ony tube In the ampli-
fier. Furthermore, Input and output terminals of the am-
plifier should be accessibl. to permit e<lSy interchanging
of system components far comparison. If antennas are
strung around the back of the console In which the ampli-
fier is Installed, arrange them so they will not interfere.
c) ELECTRICAL ISOLATION: To realize thefull benefit
of having a power ampllfl.r physically separate from the
preampllfJer'"'COi'ltrol unit and/or tuner, the power ampll..
fter should be placed at least one foot away (more ifpos.
sible) from either or both of these units. '
d) ACOUSTICAL ISOLAnON: If ampun., and speake,
are Install.d In the same cabinet, provide sufficient sep-
aration to minimize mechanical speaker vibration reaching
the amplifier. The minimum separation Is about onefo:ot.
CONSOLI MOUNTING
Having determlned a proper location for the OffFlifler In
the partlcularconsole, the correct procedure for mounting
the amplifier chaaiJ b as follows:' a) If the rubber feet'
have been imerte<! in the bottom plate, remove them (pry
out with a thin screwdriver). b) Remove the 6 sc~
which fastenth. bottom plate to the chassis., c) Place th.
bottom plate (bumps facing up) at the location on thuhelf
or other mounting surface In which It is de.lred to mount
the amplifier. With a sharp pencil, placed with its point
directly agaInst the edge of the lower surface of the bot-
tom plote, draw the outline of the bottom plate on the
shelf and also marie the positions of the four outer holes.
d) Remove
the bottom plate and drill each of the marked
holes an. the shelf to a diameter of 1'4". e) Refasten the
bottom plate to the chassis
l
with 2 8 x 3/8 screws pre-
viously removed, using the holes at the center. f) Re-
place the chouls on the shelf, positioning It exactly In
the outline previous!y drawn. 9) From the bottom side
ofthe shelf, insert a 'B x l"screw with a 1/2
10
flat washer
against the head through each of the four holes. These
screws engage thestarnped nut over each hole In the chouls
flange and when tightened secure the chassis to the shelf.
electrical in.tallatlon _
POWER
A)
POWER REQUIREMENTS, Ihe EICOMcxleI HF-14 re-
quires 65 watts at 110 to 120 volts, 60 cyeles AC.
b) REMOTE SWITCHING, Tho EICO Model HF-14, al-
though not privlded with its own ON-OFF power switch,
lIasp1oyislon faa lemoleswltchhly,llllwgl, OIloclol socket
mounted on the chassis. Pins 6 and 70f the octal socket
are Internally connected to the ends of a break In one
power transformer primary lead mid are externally con-
nected togetharbya [umper In a mal. octal plug Inserted
In
the cetelseeket, WhM this male plug is removed, pins
6 and 7 may be brought out to an external AC switch,
usually in a preamplifier unit. This Is oneofthe connect-
Ionfunctions accomplished with the octal plug-and-cable
attached to the EICO HF-65A and HF-61A preamplrner-
control unit. If the HF-14 power amplifier Is being wed
with a self-powered tuner-preampllner, the octal fur-
nished with the HF-14remains Inserted In the octal socket
(to connect the primary of the power transformer to the
AC Ifna and 10 ground on. side of the filament winding)
and the line cord « the HF-14 is Inserted in a switched
117VAC
convenience outl.t In the control unit. Note:
When using a self-powereel preamplifier-control unit,
touch one end of a wire to the preampl1fier chassis and
the other enel; at the pewer amplifier ehessls. If Q sperk
a) POWERING AUXILIARY PREAMPLIFIER, The .ame
octa.lsock,t provldn QII neconaty filament and B+ vel-
ta;elfor operatln; an CIIxIIIQ"Y preomplifl.r"'COntrol unit.
6.3 yolts I.e fllam'nt volta;., at I ampere, may be ob-
tained from ~Ins 1 a,ld 2, pin number4 on the socket sup-
plies ~y.lh DC, at a mcudmum current of 10 mtlli-
omperell anel pin 3 is GOMected to ground. ~ stated
abov., cont~1 a' 117volh AC line power to the power