Eico HF 12 User manual

WATT INTEGRATED HIGH FIDELITY AMPLIFIER
MODEL
HF-12
ELECTRONIC INSTRUMENT CO. INC.
3300NORTHERN BLVD., L. I. CITY 1, N. Y.

MODEL HF 12
72 WATT INTEGRATED
HIGH FIDELITY AMPLIFIER
general description
GENERAL
The HF12 is atrue high fidelity 12-watt integrated ampli-
fier absolutely free of the ,, gimmicks,‘sometimes used in
low-priced amplifiers. It provides complete "front end"
facilities and true high fidelity performance of such ex-
cellence that we can recommend it unreservedly for any
medium -power high fidelity application. Two HF 12*s
may be used for stereo tape reproduction, each amplifier
connecting directly to atape head with no other electronic
equipment required.
FEATURES
1
.
Two low level inputs for magnetic phono (RIAA) and
tape head (NARTB). Low noise dual triode preamplifier
with accurate, low distortion equalization for either input.
2. Two high level inputs for tv, tuner, and crystal or
ceramic cartridge.
3. Unused inputs are shorted at every position of the in-
put selector switch for zero cross-talk.
4. DC superimposed on all tube filaments to eliminate
cathode-heater leakage as asource of hum.
5. Low-noise dual triode used exclusively for separate
bass and treble tone controls. Extremely low distortion,
variable crossover, feedback-type circuit.
6. Highly stable Williamson-type power amplifier circuit.
7. Newly-designed "flat" construction, utilizing horizon-
tal chassis to permit proper layout and component separa-
tion necessary for long component life. Extremely flexible
design permits easy console installation with complete
shielding and adaptability to any panel thickness.
SPECIFICATIONS
Output Power: 12 watts continuous, 25 watts peak.
*1M Distortion (60 &6000 cps at 4:1):1.3%atl2W; 0.55% at 6W; 0.3%at4W.
*Frequency Response: 1W:±0.5 db 12 cps —75 kc; 12 W:±0.5db 25 cps —20 kc.
*Harmonic Distortion :20 cps: 2% at 4.2 W; 1/2% at 2.5W; 30 cps :2% at 1 1 W; 1/2% at 6.3 W; 40 cps :1% at 12W;
1/2% at 9.3 W; 2000 cps :1/2% at 12W; IQkc :1% at 10W; 1/2% at 6W.
*Transient Response: excellent square wave reproduction (4 usee risetime); negligible ringing, rapid settling on lOkc.
square wave.
*Transient Distortion (60 cps tone burst):less than 1% at full power.
1
COPYRIGHT*© 1960 ELECTRONIC INSTRUMENT COMPANY, Inc

Inverse Feedback; 20 db
Stability Margin:12db
Damping Factor:above 8, 20cps —15kc.
Speaker Connections: 4, 8, and 16 ohms.
Sensitivity (input for 12W):mag. phono —5mv; tape head —2mv; tuner, auxiliary —0.5 v.
Hum &Noise Level (below 12 W):mag. phono —**60 db; tape head —**50 db; tuner, auxiliary —75 db.
Tone Control Range: at 10kc, ±13 db; at50cps, ±16 db
.
Tubes: 3- ECC83/12AX7, 2- EL84, 1-EZ81.
Size: 35/8" high, 12" wide, 8 1/4" deep.
Weight:13 lbs.
*Measured from high level Inputs with tone controls set at "flat" positions.
** Includes effect of compensation.
2

mechanical installation
a) HEAT DISSIPATION (VENTILATION): In common with
other electronic equipment, the HF~12 produces consider-
able heat in normal operation. Unless continuous and ade-
quate air flow is obtained around the heat producing ele-
ments, these elements will over-heat and their useful life
will be greatly curtailed.
It is useful to understand the process of convection where-
by heat is removed in judging the suitability of alocation.
Air heated by the heat-producing elements expands and
rises; cool air is drawn from beneath to take the place of
the heated air. In this manner, astream of air Is set in
motion which continually removes heat from the ampli-
fier. (In particular, we are mainly concerned with the
major heat-producing elements; the two EL84 output tubes
and the EZ81 rectifier tube.) If there is any impediment
to or constriction of the air flow, the essential process of
heat removal will be adversely affected.
Adequate ventilation will be provided if the amplifier is
installed in an open-back console provided that the top
of the amplifier is spaced at least two inches below any
shelf mounted above it. If the cabinet is enclosed at the
rear, provide several large holes or slots as low down and
as high up in the cabinet back as possible. As an alter-
nate, holes may be provided in the sides, bottom, or top
of the cabinet. The important thing to remember is that
effective ventilation requires provision for cool air to en-
ter at the bottom and hot air to leave at the top.
If the amplifier Is not installed in aconsole, it may be
situated on an open surface or on ashelf of abookcase.
Four rubber feet are also provided so that the amplifier wi 1
1
not mar the surface of furniture on which It is placed.
b) EASY ACCESS TO CONTROLS: Mount the amplifier
at aheight which will permit easy manipulation of the con-
trols. Tuner controls should be located nearby.
c) ACCESSABILITY TO PARTS: Tubes are the most fre-
quently replaced Items In electronic equipment. If the
amplifier is installed in aconsole, sufficient space should
be alloted to reach and remove any tube in the amplifier.
Furthermore, input and output terminals of the amplifier
should be accessible to permit easy interchanging of sys-
tem components for comparison, and connection or dis-
connection of aportable tape recorder which is stored a-
way when not in use. If antennas are strung around the
back of the console in which the amplifier is installed,
arrange them so they will not interfere with access to the
amplifier.
d) ACOUSTICAL ISOLATION: If amplifier and speaker
are installed in the same cabinet (not recommended), pro-
vide sufficient separation to minimize mechanical speaker
vibration reaching the amplifier. The minimum separation
Is about one foot.
CONSOLE MOUNTING
a) Operations on console front panel preliminary to am-
plifier mounting:(1) Tape the panel template provided
to the face of the console so that the top of the mounting
surface line on the template is level with the top of the
amplifier mounting shelf. (2) Use an awl or anail to
pierce the centers of the four 5/8" diameter holes for the
controls, the 3/8" hole for the viewing of the pilot lamp,
and the two small holes for mounting the control plate, to
transfer their locations to the console panel beneath. (3)
Remove the panel template. (4) Drill the holes for the
panel controls and the pilot viewing hole (the two small
holes which have been marked are for wood screws).
b) Amplifier mounting in console:(1) Pull off the con-
trol knobs. (2) Remove the control plate, which is at-
tached to the bezel by two screws. (These may be dis-
carded since they are unsuitable for attaching the control
plate to the console panel and two ^4X3/8 wood screws
have been supplied for this purpose.) (3) Fasten the con-
trol plate to the console panel with the 2^4 X3/8 wood
screws. (4) If the rubber feet have been inserted in the
bottom plate, remove them. (They may be pried out with
athin screwdriver. )(5) Remove the four screws that fasten
the bezel to the side pieces and remove the bezel, which
is not used in console mounting. (6) Place the unit on the
mounting shelf and slide it as far forward as possible, so
that the controls penetrate the panel holes as for as pos-
sible. (7) Place aknob on each control, pressing each
knob toward the chassis firmly so that each control shaft
enters fully into its knob. (8) Draw the chassis back evenly
and carefully until the back rims of all the knobs are equally
spaced from the control plate about 1/8". (9) With a
sharp pencil, draw the outline of the side and rear bottom
edges on the chassis shelf. As the bottom plate falls short
of the full width by 3/16" on each side, draw new side
edge lines 3/16" inside the original side edge lines. (10)
Now remove the knobs and take the chassis off the shelf.
(11) Remove the 6screws which fasten the bottom plate to
the chassis. (12) Place the bottom plate exactly in the
outline drawn on the shelf and mark the position of the
center hole on the left side and the center hole on the
right side. (13) Remove the bottom plate and drill each
of the marked holes on the shelf to adiameter of 1/4".
(14) Refasten the bottom plate to the chassis, with the
four of the six *8 X3/8 screws previously removed, using
the two holes at the rear and the two holes at the front of
the chassis. (15) Replace the chassis on the shelf, position-
ing it exactly in the outline previously drawn, and restore
the knobs. This time make sure that the indicator dot on
each knob agrees with the control position. (16) From the
bottom side of the shelf, insert a^8X 1" screw, with a1/2"
flat washer against the head, through both the left and
right side center holes. These screws engage the stamped
nut over each hole on the chassis flange and when tightened
secure the chassis to the shelf.
3

electrical installation
GENERAL
a) SPEAKER CONNECTIONS: To connect your speaker
to the amplifier properly, you must know Its rated Imped-
ance. This may be read off the speaker nameplate. Con-
nect one speaker lead to the "GMterminal on the rear apron
and the other speaker lead to the nearby terminal corre-
sponding to the rated speaker Impedance (4, 8,or16ohms).
Plastic-covered lamp cord maybe used for distances up to
50 ft. with little power loss. For shorter distances, TV
antenna lead can be used, particularly If It Is desired to
run the speaker lead under arug.
If It Is desired to use two similar or Identical full-range
speakers of the same rated Impedance (either 8or 16 ohms
only) for better sound distribution, connect one speaker
lead of each pair to "G" and the two remaining leads to
the terminal with anumber equal to half of one of the
speaker's rated impedance .(It may be necessary to "phase"
the two speakers by reversing both of the leads from one
of the speakers.) This may not be done if each of the
speakers Is designed for reproduction of adifferent part
of the audio spectrum (woofer-tweeter combinations) In
which case across-over network Is required which con-
nects to the amplifier with only one pair of leads.
b) MAG. PHONO INPUT: This Input is intended for use
with phonographs having magnetic cartridges. The shield-
ed lead from your phonograph should be provided with a
shielded plug. The loading resistance presented to the
cartridge at the Input Is 47,000 ohms, which Is the most
generally suitable loading resistance for magnetic cart-
ridges.
c) TAPE HEAD INPUT: This Input Is Intended for receiv-
ing the output signal directly from the playback head of a
tape deck. NARTB tape head equalization for 71/2 and
15 I.p.s. tape speeds Is applied to signals fed In at this
Input. The loading resistance presented to the tape head
Is 100,000 ohms.
d) HIGH LEVEL INPUTS: Two high level Input Jacks des-
ignated as Tuner and Auxiliary are provided for connection
of tuners, tv receivers, equalized and pre-ampllfled tape
recorder playback, and ordinary or RIAA equalizing crystal
or ceramic phono cartridges without adaptor. Ashielded
cable with ashielded "phono-type" plug should be used
to connect each of these sources to the corresponding am-
plifier input Jack. Unless the source has alow-impedance
output such as acathode follower (with which up to 50ft.
of cable can be used), use theshortestposslble connection
and low capacity shielded cable (cable having as low as
25mmfd capacitance per foot Is available).
If the tuner employed has avolume control to adjust the
output, set this control to give about the same sound level
for any given setting of the amplifier VOLUME control as
obtained from an average orchestral recording played on
your phonograph. If you do this, there will not be any
extreme change in sound level when switching from phono-
graph to tuner or vice versa.
e) TAPE OUTPUT: Ashielded cable (up to 30 ft. may be
used) with ashielded "phono-type" plug should be used
to connect from the TAPE OUTPUT Jack to the Input of the
tape recorder. Any input chosen by the SELECTOR Is fed
out to the tape recorder through this jack. Phono inputs
fed In at MAG. PHONO are of course equalized accord-
ing to the RIAA characteristic and all the Inputs are af-
fected by the level and tone controls.
f) POWER CONNECTIONS: The 117VAC, 250 Wre-
ceptacle is "live" or "dead" depending on whether the
amplifier power switch is turned on or off. By plugging
Into It the line cords of associated equipment (tuner, tape
recorder, etc.) it is possible to turn these components on
or off with the amplifier. Use acube tap if It Is desired
to connect more than one device. Record changers and
turntables should be plugged into awall outlet as apro-
tection to the mechanisms of these units.
HUM ADJUSTMENT
a) After checking the amplifier for proper operation, re-
move all input cables to the amplifier and make the follow-
ing control settings which hold throughout the process of
hum adjustment: SELECTOR at PHONO, LEVEL to 10,
TREBLE control at "5, BASS control at 0. Next, procede
as follows: With your ear held close to the speaker, insert
the amplifier power plug into the wall outlet and listen to
the hum level. Now pullout the plug and reinsert it with
the prongs reversed and listen again. Choose the prong
position which gives the least hum ,Now connect the tuner
Input connector to the amplifier input jack, and with tuner
set between stations and the tuner volume control set at
minimum, do the same with the power plug of the tuner,
using the 117VAC convenience outlet on the amplifier if
desired. Finally connect the phono input connector to the
amplifier MAG. PHONO or AUX. Input (as required) and
find the lowest hum position for the power plug of the
phonograph In awall outlet. Do this with the phonograph
off and the pickup arm at rest position.
4

operation
PRELIMINARY: Be sure all tubes are firmly seated in their
sockets and that the VI tube shield is making good contact
with its base. As initial adjustments, set these controls
as follows: VOLUME at zero, BASS at zero. Turn the am-
plifier on by turning the TREBLE control clockwise from
OFF and set It at zero Initially. Note that the VOLUME,
BASS, and TREBLE controls all affect the TAPE OUTPUT.
LISTENING TO PHONOGRAPH: Set the SELECTOR to
PHONO if you have amagnetic cartridge or AUXillary if
you have aceramic or crystal cartridge. The RIAA equa-
lization provided for magnetic phono cartridges Is now the
standard In the recording Industry and is also avery good
compromise for the most important of the older characteris-
tics. The better ceramic cartridges are also self-equalizing
according to the RIAA characteristic. Use the separate
bass and treble tone controls to compensate for inexact
matching of the actual recording characteristic as well as
the over-all characteristics of your audio system (Including
room acoustics).
LISTENING TO TAPE DECK (direct connection to tape
head): Set the SELECTOR to TAPE HEAD. NARTB tape
equalization for the 71/2 and 15 I.p.s. speeds is provided
by the preamplifier-equalizer at this position. This equali-
zation Is the industry standard for pre-recorded stereo and
monaural tapes. The bass and treble tone controls can be
used to compensate for inexact matching of the actual re-
cording characteristic.
LISTENING TO TUNER, TV, TAPE RECORDER HAVING
BUILT-IN PLAYBACK PREAMPLIFIER -EQUALIZER: Set
the SELECTOR to TUN or AUX depending on the Input
desired. The corresponding high level input will feed
through the amplifier. Adjustment of the level control on
each source is discussed in the "ELECTRICAL INSTALLA-
TION" section under "High Level Inputs".
MAKING RECORDINGS: Tape recordings may be made
by connecting the recorder to the TAPE OUTPUT jack. See
"Tape Output" under "ELECTRICAL INSTALLATION"
Please note that recordings cannot be made on tape decks
intended only for stereo or monaural tape playback. Re-
cordings can only be made on tape machines having record-
ing facilities including the necessary electronic equipment,
which may be either built-in or supplied separately by the
tape deck manufacturer.
BASS CONTROL: The plus sign on the right side of the
dial indicates that clockwise rotation from the mid-point
(0) Increases (boosts) bass response; the minus sign on the
left side indicate that counter-clockwise rotation from the
mid-point decreases (cuts) bass response. There is no in-
teraction with the TREBLE control. Start all adjustments
with this control set at the mid-point (0), which is called
the "flat" position since bass repsonse is neither cut nor
boosted at this setting.
TREBLE CONTROL: The plus sign on the right side of the
dial indicates that clockwise rotation from the mid-point
(0) increases (boosts) treble response; the minus sign on
the left side indicates that counter-clockwise rotation from
the mid-point decreases (cuts) treble response. There is no
interaction with the BASS control. Start all adjustments
with this control set at the mid-point (0), which is called
the "flat" position since treble response is neither cut nor
boosted at this position.
maintenance
TROUBLE SHOOTING &OPERATING NOTES
Your amplifier should require little service except for nor-
mal tube replacement. We recommend no substitutions for
the tube types used in this amplifier except as stated. All
the tube types used are distributed nationally, but replace-
ments can be obtained directly from EICO If desired.
To facilitate servicing, remedial and trouble-shooting pro-
cedures have been provided in the TROUBLE-SHOOTING
CHART that follows. AVOLTAGE AND RESISTANCE
CHART is also provided as an aid In locating defective
components. DC operating voltages are given both at no
signal and signal developing 50 watts output, as well as
the corresponding 1kc signal voltages.
TROUBLE-SHOOTING PROCEDURES
Connect aphonograph and speaker to the amplifier as de-
scribed in "Electrical Connections" and set controls for
phono listening. Play aknown high quality LP recording
on the phonograph. If there is no output to the speaker
or if the output Is low or audibly distorted, procede to the
checks for those symptoms. If there is excessive hum in
the output, disconnect the phono input cable from the
amplifier and short the phono input jack to chassis. If the
hum disappears, the trouble is not in the amplifier but in
the phonograph or in the connection to the amplifier.
The cause of phonograph hum maybe ametal pick-up arm
not grounded to the cable shield (try agood single ground
5

connection to the cableshield from turntable frame, pick-
up arm, and cartridge case), direct hum pick-up by the
magnetic cartridge from the record player motor (try using
arubber mat on the turntable to Increase the separation of
the pick-up from the motor), or pick-up from apower trans-
former or other magnetic field in the vicinity (try moving
phonograph away from suspected source). Check also that
the phono Input cable shielding Is grounded to the ampli-
fier chassis at one point only through the skirt of the Input
connector where it plugs Into the amplifier. Finally, try
agood building ground such as aconnection from acold
water pipe terminated under speaker terminal "G" on the
amplifier. Do not connect such aground wire to other
components In the system.
Excessive hum on other inputs may be checked in asimilar
manner. Disconnect the Input cable In question and short
the particular input jack to the chassis. If the hum dis-
appears, the trouble Is external to the amplifier. Note
thaton all inputs, the braid of the Input cable should con-
nect to the amplifier only through the skirt of the Input
connector. The cause and remedies for the following symp-
toms are then based on the assumption that checks made in
the manner described above have eliminated the possibility
of the trouble being external to the amplifier.
If the trouble is no output or low output, check AC signal
voltages and DC operating voltages starting at the input
and working step-by-step toward the output. Set the
VOLUME control to maximum (10), and the BASS and
TREBLE controls to their mid-points (0). Use a1000 cycle
sinewave signal ,such as supplied by the EICO 377 Sine &
Square Wave Audio Generator. In addition, use apre-
cision 100 :1attenuator to permit obtaining alevel of
0.01 volt fed into MAG. PHONO from an audio generator
output of 1.0 volt, which can easily be measured on the
lowest AC volts range of your VTVM (also improves signal
to hum from generator). Use ahigh input Impedance VTVM
for all AC signal voltage measurements (such as the EICO
232,249,221, or 214) anda VTVMor20,000Q/voltVOM
for DC voltage measurements.
If the trouble is an excessively distorted output, try tube
replacement, signal tracing, orprocede directly to voltage
and resistance measurements.
When the defective stage is localized, proc^deto aresist-
ance and voltage check of the stage, using the data In the
VOLTAGEand RESISTANCE chart. Disconnect the ampli-
fier from the power line and discharge capacitors prior to
making any resistance check and prior to removing either
or both of the EL84 output tubes V4 and V5. Do not turn
the amplifier on with either of the output tubes removed.
TROUBLE-SHOOTING ATYPICAL TUBE STAGE
1.Check tube.
2. Check plate and cathode resistors.
3. Check coupling capacitors for leakage or short.
4. For output stage, check dc resistance of transformer
windings.
5. Check grid leak resistor for open.
6. Check cathode by-pass capacitors for short.
7. If no or low B* voltage on tube, check decoupling
path for open or defective R18, R31 ,R32, R33 and filter
capacitor C17 or C18.
8. If wiring and circuit components including the tube
check O.K. and B+ voltage is excessive, check the de-
coupling path for short or defective R18, R31 ,R32, R33.
Suspected trouble In the equalization, tone, and volume
controls and networks should lead to specific resistance
and capacitance checks to localize the trouble. In gen-
eral, if the user suspects poor frequency response, defec-
tive equalization, or defective operation of the tone con-
trols, the amplifier should be tested thoroughly with audio
generator, vtvm, and scope.
SERVICE
If trouble develops in your instrument which you can not
remedy yourself, write to our service department listing
all possible indications that might be helpful .Note num-
ber appearing in red under the word "Manual" on the front
cover. If there is no number, state this. If desired, you
may return the instrument to our factory where it will be
placed in operating condition for $7. 50 plus the cost of
parts replaced due to their being damaged in the course
of construction. NOTE: Before returning this unit, be
sure all parts are securely mounted. Attach atag to the
instrument, giving your home address and the trouble with
theunit. Pack very carefully in arugged container, using
sufficient packing material (cotton, shredded newspaper,
or excelsior), to make the unit completely immovable
within the container. The original shipping carton is sat-
isfactory, providing the original inserts are usedor suffi-
cient packing material is inserted to keep the instrument
immovable. Ship by prepaid Rai Iway Express, if possible,
to Electronic Instrument Co. ,Inc., 33-00 Northern Blvd.
,
Long Island City 1, N. Y. Return shipment will be made
by express collect. Note that acarrier cannot be held
liable for damages in transit if packing IN HIS OPINION,
is insufficient.
6

TROUBLE-SHOOTING CHART
SYMPTOM
Amplifier causes power line fuse
to blow. Power line fuse blows a-
gain with V6 out of socket.
Amplifier causes power line fuse
to blow. Power line fuse does not
blow again with V6 out of socket.
Any or al Itube filaments not lit.
DC voltage at V6 cathode (pin 9)
is incorrect as specified below.
a) No voltage
b) High voltage.
c) Low voltage.
Excessive hum on mag. phono
or tape head.
Excessive noise on mag. phono
and tape head
Sustained oscillations.
Sustained microphonics on mag.
phono and tape head.
Hum on all inputs
CAUSE
Line cord, J6, primary or high voltage
secondary windings of T2 shorted internally
or externally (wiring).
V6, C17, V4, V5, or T1 primary shorted
internally or externally.
Open lead from 6.3 Vwinding of T2
.
6.3V winding of T2 open.
Defective V6
C17 shorted internally or externally.
Connection from Cl 7to pin 9of V6 broken.
Connection to center tap of h.v. secondary
winding of T2 open.
Output tubes V4 &V5 over-biased or not
drawing current.
Excessive current drain in amplifier.
Defective V6
VI defective
Fil. leads dressed too close to grid lead.
Tube shield not making electrical contact
to base or base not making electrical con-
tact to chassis.
Shielding and grounding of wiring to input
jacks not exactly as instructed and shown
in drawings.
VI socket and contacts dirty.
Poor dress of output transformer T1 leads
VI defective.
V2 defective, not properly shielded, or
dirty sockets and contacts.
Dress of power transformer T2 leads.
REMEDY
Replace or repair.
Replace or repair.
Repair
Replace
Replace
Replace or repair.
Repair
Repair
See trouble-shooting typical tube
stage.
See trouble-shooting typical tube
stage.
Replace
Replace
Dress fil
.
leads away from grid lead.
Check and correct
Correct
Clean throughly with carbon
tetrachloride.
Dress all input leads and T1 leads
away, from each other. Keep T1
leads away from input jacks.
Replace
Replace, correct, or clean.
Correct
7

TUBE
ECC83/12AX7
VI
ECC83/12AX7
V2
ECC83/12AX7
V3
EL 84
V4
EL84
V5
EZ81
V6
VOLTAGE AND RESISTANCE CHART
DC VOLTS DC VOLTS AC VOLTS (1 kc) RESISTANCE
PIN* NO SIGNAL 12 WOUT 12 WOUT UNIT OFF
1108 108 0.52 300KO
2000.028 1MO
31.2 1.2 04.7KO
4&5 filament (12 *14 DC; 6. 3VAC to pin 9) 165*1900
668 68 0.028 300KO
70 0 0.005 480KO
8
9
0.6
fi lament
0.6 0.009 2.2KO
165*1900
1185 185 275KO
20 0 0.5 500KO
31.4 1.4 0.265 1.2KO
4,5 filament (12 -14VDC; 6.3 VAC to pin 9) 165-190 0
6180 180 1.38 130KO
7000.26 400KO
8
9
1.6
filament
1.6 0.135 3.3KO
165 -190 0
1190 190 7.7 120KO
291 90 8480KO
393 92 7.7 100KO
4&5 filament (12 "14VDC; 6.3 VAC to pin 9) 165*1900
691 90 8480KO
7001.37 210KO
8
9
0.85
filament
0.8 1.25 1.8KO
165-1900
1-———
2 0 07.7 340KO
312 14.2 0.05 165-1900
4&5 filament (12 “14VDC; 6.3VAC between) 165-1900
6-—--
7330 324 176 1600
8----
9336 330 3.9 0
1-_—-
2 0 07.7 340KO
312 14.2 .05 165-1900
4&5 filament (12 -I4VDC; 6.3VAC between) 165-1900
6----
7330 324 176 200 0
8----
9336 330 3.9 0
1- --280 95 0
2----
3336 330 -160KO
4& 5filament (12 -14VDC; 6.3 VAC between) 165-1900
6---—
7--280 95 0
8----
9336 330 -160KO
AH resistance measurements/except those made from pins 3and 9of the EZ81, are
made with pins 3and 9of the EZ81 grounded.All voltages and resistances are^neasured
to chassis with the volume control set to 10 on the dial, the TREBLE and BASS con-
trols set to 0and the SELECTOR SWITCH set to AUX. For voltage measurements at
12W output, set the input selector to the PHONO position and feed a0.010 volt
(lOmv) 1kc signal to the mag. phono input jack; connect aresistive (preferably non-
inductive) load of equal resistance to the tap selected (±20%) and capable of handling
25 watts. Voltage measurements are made with aVTVM. Operating line voltage at
which voltage measurements are made is 117 VAC, 60cps. NOTE: ALL VOLTAGE
AND RESISTANCE VALUES MAY VARY NORMALLY BY ±15%.
8

Entries are numbers of those switch contacts which are
connected togetherby the rotors at the particular position
.
117VAC
250W
TRANSFORMER TEMPERATURE
The temperature of the transformers used in the HF-12 run at less than 195° despite the fact that the safety limit is at amuch
higher 221°F. Although I95°F is cool for atransformer, it is very hot to the touch. Transformers which seem too hot when
touched with the hand, are usually good and are actually not overheating.
Output transformers usually run cooler than power transformers. Some output transformers may appear hotter than others due
to being located near hot components such as output and power tubes and power transformers.
OUTPUT TRANSFORMER LOAD
The output transformer and the output tubes of any amplifier are subjected to severe stress when the amplifier is operated at
ahigh signal level without aload. To protect these components against possible damage, always have either aspeaker or
resistive load connected to the output terminals of the amplifier while it is being operated.
9

REPLACEMENT PARTS LIST
Stock* Sym. Description Am't. Stock* Sym, Description Am
20050 Cl cap., paper, .25mfd -200 V4*154003 TB8, 3terminal strip, 2post 2
22517 C2,12,13 cap., disc., .025 mfd (25K or 25,000) 354013 TB10 terminal strip, 1post left w/gnd 1
22549 C3 cap., disc., .003 mfd (3K or 3000) 190034 VI, 2, 3tube, 12AX7 3
22514 C4,6 cap., disc., 850 mmf, 10% 290039 V4, 5tube, EL84 2
23020 C5 cap., elec., 25 mfd -6V 1•190038 V6 tube, EZ81 1
20044 C7 cap., molded, .25 mfd -400 V®197712 XII pilot assembly 1
20039 C8 cap., molded, .lmfd -400V ** 197027 XVI socket, 9pin min. top mount 1
22529 C9 cap., disc., 150mmf, 10% 197025 XV2-6 socket, 9pin min. bottom mount 5
22539 C10,ll cap., disc., 200mmf, 10% 240000 nut, hex, *6-32 25
22533 C14 cap., disc., 47 mmf, 10% 140001 nut, hex, *3/8 5
23007 C15 cap., elec., 50mfd -25V »*140007 nut, hex, *4-40 16
20043 C16 cap., molded, .03 mfd -600 V«>140008 nut, hex, *8-32 12
23016 C17 cap., elec., 30mfd -400V •140026 nut, tin. *8-32 6
24005 C18 cap., elec., 20-40-40 mfd-400-350-350
V
140027 nut, angle tin dual *8 2
22507 C19 cap., disc., .0022 mfd, 10% (2.2K or 2200) 141000 screw, *6-32 x1/4 25
22523 C20 cap., disc., .0068 mfd, 10% (6.8K or 6800) 141003 screw, *8-32 x3/8 6
23014 C21 cap., elec., lOmfd -6V **141016 screw, *4-40 x1/4 12
92000 11 pilot light 141026 screw, *4-40 x1/4 brass 2
50011 J1-2, 3-4 jack, dual phono 241027 screw, *4 wood 2
50014 J5jack, single phono 141028 screw, *8-32 x12
50016 J6 outlet, convenience 141045 screw, *6 P. K. brown finish-4
29751 PCI printed circuit 141046 screw, *8-32 x3/8 brown finish 4
10410 Rl, 15 res., 100Kn,l/2W, ±10% 241047 screw, *8 P. K. 4
10431 R2, 19,36 res., 470KO,1/2W, ±10% 342000 washer, lock, *3/8 5
11526 R3,4 res., 200KQ,1/2W, ±5% 242001 washer, flat, *3/8 1
10423 R5 res., 2.2KQ, 1/2W, ±10% 142002 washer, lock, *6 22
10430 R6 res., 4.7KQ, 1/2W, ±10% 142007 washer, lock, *4 14
10407 R7,8 res., 1MQ, 1/2W, ±10% 242008 washer, lock, *8 12
11504 R9 res., 90KO, 1/2W, ±5% 142032 washer, flat, *8 2
10400 Rl 0, 21,26,27 res., 10KQ, 1/2W, ±10% 4 43000 lug, *6 2
18038 Rl 1pot., 500KQ, audio taper (volume) 143004 lug, *8 1
18033 R12 pot., 1MQ, linear taper (bass) 146000 grommet, 3/8 1
18034 R13,S2 pot., 500KQ, linear taper, CT (treble) 146006 feet, rubber 4
10426 R14,32 res., 33KO, 1/2W, ±10% 250012 insulator for 5001
1
2
10427 R16 res., 1.2KO, 1/2W, ±10% 151006 plug, phono 5
10420 R17 res., 3.3KO, 1/2W, ±10% 153007 knobs 4
10853 R18 res., 10KG, 1W, ±10% 157000 line cord 1
11543 R20 res., 1.8X0, 1/2W, ±5% 158004 wire, hook-up length
11527 R22,23 res., 100XQ,1/2W, ±5% 258300 spaghetti length
10412 R24,25 res., 330X0, 1/2W, ±10% 258408 cable, single conductor length
14600 R28 res., 165Q, 5W,± 5% 158410 cable, 4conductor length
11538 R29 res., 22KO, 1/2W, ±5% 158501 wire, bare *22 length
19009 R30 pot., 100 O, (hum adjust) 180049 control plate 1
10422 R31 res., 68KO, 1/2W, ±10% 181084 chassis 1
10520 R33 res., 68X0, 1/2W, ±5% 181091 bezel 1
10425 R34 res., 56Ka 1/2W, ±10% 181092 bottom plate 1
10419 R35 res., 270Kai/2W, ±10% 181103 bracket, left 1
60049 SI switch, selector 181104 bracket, right 1
32005 T1 transformer, output 181105 perforated screen 1
30019 T2 transformer, power 189204 label, rear apron 1
54017 TB1 terminal strip, 1post upright 189205 label, tube layout 1
54500 TB2 terminal board, 4post 197300 tube shield 1
54002 TB5 terminal strip, 1post right w/gnd 197710 jewel, red 1
54004 TB4,9 terminal strip, 2post w/gnd 266052 manual of instruction (wired) 1
54015 TB6 terminal strip, 3post, 2left w/gnd 166304 manual of instruction (kit) 1
54000 TB7, 11,12 terminal strip, 1post left 3

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72
WATT
INTEGRATED
HIGH
FIDELITY
AMPLIFIER
MODEL
HE
12

GENERAL
INSTRUCTIONS
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