Eico HFT-92 User manual

MODEL HF-92 Ah1&FM TUNER
GENERAL
The new Model HFT-92 FM/AM tuner incorporates the
justlyfamousHFT-90 High Fidel ityFM tuner together with
excellent AM tuning facilities. Thisisnota "stereo" type
FM/AM tuner since both types of reception cannot be ob-
tained at the same time.
The FM section includes an entirely pre-wired and pre-
aligned "front end" housed aid completely shielded In a
solid alumlnum-iinc casting. This "front-end" not only
entirely stable and guaranteed drift free by virtue of the
most advanced circuitry and temperature -compensated
components. Just as in the costliest aid finest FM tuners
available, no APC Is used because none is needed. Cither
FM performance features Include stabilized low limiting
threshold for excellent performance from wedeer signals
and abroad-band ratio detector for Improved capture ratio
and easier tuning.
Precision "eye-tronlc" tuner is employedon both FMand
AMusing the DM-70 traveling eye indicator that contracts
SPECIFICATIONS
Into an "exclamation point" at the exact center of each
broadcast charnel. Astage of audio amplification and a
cathode fol lower output stage provide high output with low
output impedcnce. An FM multiplex output is provided
also. The full -wave rectifier and heavy filtering provide
astable dependable power supply.
Additional important features include: slide-rule dial,
effortless flywheel tuning, low Inter-station noise, aid
front-panel volume control and on-off switch.
The FM "Front end" is supplied completely pre-aligned
and all IF coils in both FM and AM sections are supplied
pre-aligned so that an Instrument alignment should not be
anecessity for operation of thecompleted kit. Thesuper-
bly convenient and extremely rugged mechanical construc-
tion features asingle horizontal chassis to permit proper
layout and component separation necessary for long com-
ponent life andstabillty. important construction aids In-
clude simplified dial cord arrangement and pre-wired tun-
ing eye assembly. Extremely flexible design permits easy
console installation with different thicknesses of panel.
FM AM
Sensitivity 1. 5uv for 20 db quieting 2. 5uv for 30 db
quieting. Full limiting from 25 uv 2ttjv for 0. 8v output with 15 db S/N
Selectivity (IP Bandwidth) 240 kc at 6db 8kc at 6db
Antenna Input 30 ohms balanced Ferrite Rod: terminals for external
antenna provided
Stability Max. drift of 20 kc (2 parts in 10, 000) from
cold start
Excellent
Frequency Response 20-20, 000 cps ±1 db 20-5000 cps £3 db
Hum 60 db below 1volt 60 db below 1volt
Output ^Min. output of 1volt with 10 uv input, 30%
deviation Min. output of 0. 8volt with 20v in-
put, 30% modulation
Image Rejection 30 db 40 db
Tuning Range 88- 108mc 540- 1650 kc
Total Harmonic Distortion 1.5% Below 2% up to 70% modulation
Ratio Detector Peak 600 kc
Separation
Controls: Tuning, volume/power on-off, FM-AM Selector
Size: (HWD): 35/8" x12“ x81/4-
Shipping Weight: 12 lbs.
1
COPYRIGHT© 1959 ELECTRONIC INSTRUMENT COMPANY, Inc.

mechanical Installation
a) HEAT DISSIPATION (VENTILATION): In common with
other electronic equipment, the HFT-92 produces consid-
erable heat in normal operation. Unless continuous aid
adequate air flow is obtained around the heat producing
elements, these elements will over-heat and their useful
life will be greatly reduced.
Adequate ventilation will be provided if the tuner is in-
stalled In an open-back console provided that the top of
the tuner is spaced at least two inches below any shelf
mounted above if. 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 aspossible. As an alternative,
hales may be provided in the Jides, bottom, ortop of the
cabinet. The important thing to remember is that effective
ventilation requires provision for cool air to enter at the
bottom and hot air to leave at the top.
If the tuner is not installed In aconsole, it may be situated
on an open surface oron ashelf of abookcase. Four rub-
ber feet are also provided so that the tuner will not mar
the surface of furniture on which it Is placed.
If it is considered essential, because of space limitations
to "stack" a matching amplifier such as the HF-12 with
the tuner (not recommended for reasons described above),
place the wnpllfier above the tuner since the amplifier
produces substantially more heat aid requires more venti-
lation.
b) POSITION: The specified absence of tuning drift can
be fully assuredonly if the tuner is placed in an approxi-
mately horizontal position, which is therefore strongly
recommended.
c) EASY ACCESS TO CONTROLS: Mount the tuner at a
height which will permit easy manipulation of the con-
trols. Amplifier controls should be located nearby.
d) ACCESSABIL1TY TO PARTS: Tubes are the most fre-
quently replaced items in electronic equipment. If the
tuner Is installed in aconsole, sufficientspace should be
al lotted to reach aid remove any tube in the tuner. Fur-
themore, antenna and output terminals of the tuner should
be accessible to permit easy interchanging of system com-
ponents for comparison. If aitennas are strung around
the back of the console in which the tuner is installed,
arraige them so they will not interfere with access to the
tuner.
e) ACOUSTICAL ISOLATION: If tuner andspeaker are
installed in the same cabinet (not recommended), provide
sufficient separation to minimize mechanical speaker vi-
bration reaching the tuner which may result in microphon-
ics and howling. The minimum separation is about one foot.
Abaffle, usually the tuner mounting base, should be pres-
ent between tuner aid speaker, in extreme cases, it may
be necessary to mount the tuner on sponge rubber pods.
CONSOLE MOUNTING
NOTE: The tuner may be installed in aconsole with the
slide-out perforated cover in place. We recommend the
use of the cover even in console mounting for the addi-
tional shielding and protection it provides. The thickness
of the console panel may be up to 3/8".
a) Operations on console front panel preliminary to the
tuner 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
tuner mounting shelf. (2) Use an awl or anail to pierce
the centers of the two 3/8" diameter holes for the controls,
and the two small holes for mountingthe control plate, to
transfer their locations to the console panel beneath. (3)
Use ai awlornail to mark thefour corners of the rectan-
gular tuning dial cut-out. (4) Remove the panel template
and draw the dial cut-out with apencil. (5) Drill only
the holes for the panel controls (the two small holes which
have been marked are for wood screws). (6) Now make
the dial cut-out, which must be done accurately. It is
recommended that the rough cut-out be made slightly
undersize and then finished accurately aid smoothly with
afile. Then use the file to make asnioothly finished 45
degrees bevel on the lower edge of the cut-out sloping
downward from the outside surface to the inside surface.
The beveled surface must be smooth so that the wire going
to the tuning eye socket will not catch or otherwise be
obstructed when the tuning eye is moved along the dial.
b) Tuner mounting in console: (1) Pull off the control
knobT (2) Remove the four screws that fasten the bezel
to the side pieces and remove the bezel, which is not
used in console mounting. (3) Remove the control plate,
which Is attached to the bezel by two screws and nuts.
(These may be discarded since they are unsuitable for
attaching the control plate to the console paiel and two
4x3/8 wood screws have been supplied forthis purpose.
)
(4) Fasten the control plate to the console panel wtth the
two *4 x3/8 wood screws. (5) If the rubber feet have
been inserted in the bottom plate, remove them. (They
may be pried out with athin screwdriver. )(6) Place
the unit on the mounting shelf and slide it forward until
the front surface of the tuning dial rests against the turned-
in edge of the dial cut-out in the control plate and the
control shafts are centered in the holes. (7) With asharp
pencil, draw the outline of thesldeand rear bottom edges
on the chassis shelf. As the bottom pi ate fa] Is short of the
full width by 3/16" on eachslde, drawnew side edge Itnes
3/16" inside the original side edge lines. (8) Now fake
the chassis off the shelf. (9) Remove the 6screws which
fasten the bottom plate to the side pieces. (10) Place
2

the bottom pi ate exactly In the outline drown on the shelf
and mark the position of the center hole on the left side
and the center hole on the right side. (11) Remove the
bottom plate end drill each of the marked holes on the
shelf to adiameter of 1/4“ .(2) Refceten the bottom
plate to the side pieces, with four of the six *8 x3/8
screws previously removed, using the front end rear holes
on the side pieces which are fitted withspeed nutt. (13)
Replace the chassis on the shelf, positioning It exactly
in the outline previously drawn, and push on the knobs.
The Inner knob of the left-hand concentric is for VOL-
UME/OFFand the outer knob Is the SELECTOR for either
FM or AM reception. Make sure that the indicator dots
on both knobs agree with the control positions. (14) From
the bottom side of the shelf Insert a #8 x1" screw, with
a1/2" flat washer against the head, through both the left
wid right side center holes. These screws engage speed
nuts on the side piece center holes and when tightened
secure the chassis to the shelf.
electrical installation
FM ANTENNA
Any VHF 300 ohm TV antenna will serve very well as an
antenna for the tuner. If the antenna is also being used
with atv sot, it Is advisable to use <*i inexpensive two-set
coupler. If an antenna is to be instal led forFM reception
only, a300 ohm FM antenna composed of afolded dipole
and reflector is recommended. The best reception in ex-
treme fringe areas will be achieved with an FM yogi
antenna properly oriented for maximum sensitivity in the
direction of the broadcasting station. The antenna in all
cases Is connected to the ANT. INPUT terminals on the
rear chassis apron. Good results may be obtained inex-
pensively with an Indoor dipole antenna fashioned from
300 ohm twin lead as shown below. Note that the length
of the lead to theANT. INPUT terminals is not critical.
Any convenient length may be used.
TO ANTENNA INXJT TERMINALS Fig. 1
AM ANTENNA
AM signals are picked up by aferrite-rod antenna at the
chass.s rear. As the ferrite-rod is directional. It may be
foundvaluable in aparticular installation toswing the rod
out madirection that provides best reception. This can
be done by removing the screw and washerthat holds the
rod to the stand-off nearest the power transformer.
If reception is marginal on a desired station or stations, a
straight wire type of antenna may be used. For strong
station reception awire two to eight feet long Inside the
room aid connecting to the ANTENNA terminal will suf-
fice. In difficult locations, along wire outside antenna
is used. Be sure to use cm insulator between each end of
the antenna and the ob|ect from which the entennaend Is
suspended as well as alightning arrestor at the outside
point where the lead-in enters the home (one terminal of
the lightning arrestor must be connected to the earth-
ground). The GND. terminal on the AM tuner chassis is
connected to the ground terminal on your amplifier, which
in turn should be connected to true earth ground such as
aground rod or awater pipe.
DO NOT CONNECT THE TUNER TO ANY AC-DC E-
QUIPMENT: Connecting the tuner to AC-DC equipment
will mdte tuner chassis "hot" to one side of the AC line,
except where the Input of the AC-DC amplifier Is isolated
from the AC line. In general, this is very dangerous
practice aid strictly disallowed because fatal shock may
result.
POWER
Plug the line cord Into any outlet supplying 117volts, 60
cycle AC power. Variation of the line voltage from 105
to 125 volts is not critical, but it must be 50 or 60 cycles
AC. This outlet may be aswitched convenience outlet on
an amplifier having controls wid switching facilities if the
convenience of having power to the tuner controlled by
the ON-OFF switch on the amplifier is desired. On the
other hand. If the tuner Is being operated with apower
amplifier having no controls itself, plug the line cord of
the power amplifier Into the convenience outlet at the
back of the tuner (so that the amplifier will be turned on
and offwith the tuner) and plug the tuner line cord Into a
wall outlet.
AUDIO OUTPUT
Ajack marked "AUDIO OUTPUT" will be found on the
rear chassis apron. Alow-capacity shielded cable of the
shortest practical lengthpossibleshouldbe used to connect

this jack to the TUNER Input jack of the amplifier. Such
acable with connectors may be purchased at an electrical
supply store or made up from the desired length of cable
and two RCA male phono connectors.
MULTIPLEX OUTPUT
Ajack marked "MULTIPLEX OUTPUT" will be found on
the rear chassis apron. At this output, the audio signal
operation —
before de-emphasis is obtainable. This jack Is provided
for use if andwhen multiplex FM transmission for stereo-
phonic FM broadcasting becomes afact. At such time,
ElCOandother manufacturers wi 1 1 make available multi-
plex reception equipment which will make use of this
output.
The HFT-92 h<o three controls. The TUNING control at
the right selects the station. The VOLUME/OFF control
at the left turns the tuner on andofftoid controls the cudio
output level. The SELECTOR switch concentric with it
chooses either FM or AM operation.
To turn the tuner on, rotate the VOLUME control clock-
wise from the OFF position. Allow a one minute warm-up
for completely stable operation. Then set the SELECTOR
switch to the desired type of broadcast reception, FM or
AM, and use the TUNINGcontrol to set thetunerto the
desired station. Read the uppermost scale when set to
FM aid the middle scale when set to AM. The lowest
scale, 0-100, is alogging scaleused to facilitate accur-
ate re-setting to aparticular station. The tuning position
is shown by the traveling eye-tube indicator. Correct
tunlngofeach broadcast channel, FMor AM, is indicated
by maxirmrm contraction of the luminous "exclamation
point".
Amoderate difference In average volume when switching
from FM to AM or vlsa-versa is to be expected and is
easily adjusted with the tuner VOLUME control. Also,
bear in mind the different character of AM and FM recep-
tion. AM is not Interference-free, the noise level is
higher, aid the frequency range is generally restricted
as compared to FM.
maintenance
OPERATING NOTES
Your tuner should require little service except for normal
tube replacement. No substitutions for tube types used in
this tuner Is permissible. All tube types used are distri-
buted nationally, but replacements can be obtained direct-
ly from EICO if desired.
If dial calibration seems to be in error, it can always be
corrected by re-setting the position of the tuning-eye In-
dicator carriage on the dial cord.
When connected properly, the hum originating in your
HFT-92 tuner is inaudible. If the hum level is high due
to defective components, alignment orinstal lotion, please
check the Following.
1. Check tubes VI through V8 for excessive heater-cath-
ode leakage or grid-cathode short.
2. Check C25 for value of capacity and Iedrags.
3. Check the dress of all leads connected to the grids of
all the tubes. Dress away from AC filament and power
lines. Exercise special precautions with leads to pin 2
and pin 6of V2.
4. Check alignment of T2 through T6.
5. Reverse AC plug in receptacle to determine position
for minimum hum.
6. Run wire from tuner to amplifier chassis. Connect
chassis of amplifier to ground (water or steom pipe).
ALIGNMENT PROCEDURE
1. Plug line cord into 117VAC, 60cycle outlet. Rotate
VOLUME control clockwise from AC OFF to turn tuner on
and set at maximum clockwise position for full volume.
Allow full 5minute$warm-uptlmebeforealIgnment. All
instruments Including sweep generators, sipial generators
end VTVM, should be allowed to warm up for 15 minutes
before use to insure against drift during alignment.
2. Check the voltages as given inthevoltage chart using
either aVTVMora20, OOOohms/volt VOM. Ail voltages
arecheekedwithaline voltage of 117VAC. If line volt-
age is actually 117VAC, all voltages should measure as
stated within ±15%. If line voltage Is dxxit or below
117VAC, then the diserepwicy must be considered in in-
terpretingthe permissiblevariatlon in measured voltages.
Note that voltages are measured under no-signal condi-
tions. Ifvoltages check out to given, proceedwlthallgn-
ment.

3. Set SELECTOR switch to AM and proceed toalignment
Instructions for"AMALIGNMENT USING SIGNAL GEN-
ERATOR AND SCOPE OR VTVM".
4. Set SELECTOR switch to FM and proceed to alignment
instructions either for "FM IF ALIGNMENT USING AM
SIGNAL GENERATOR" or "FM IF ALIGNMENT USING
SWEEP GENERATOR &MARKER OSCILLATOR, VTVM
or SCOPE". NOTE: FM IF alignment method, requiring
asweep generator and an oscilloscope, Is of course pre-
ferred. If this equipment is not available however, good
results will normally be obtained by the simple signal
generator method described also. Please read the whole
procedure through very carefully before starting/ includ-
ing the IMPORTANT NOTE regarding the FM "front-end"
(RF Tuning Assembly). Under no condition tamper with
the setting of the RF SENSITIVITY TRIMMER or the OS-
CILLATOR TRACKING TRIMMER intheFM "front-end".
Do not tamper with aseemingly defective FM “front-end"
unit. Return It toElectronic Instrument Co., Inc., 33-00
Northern Blvd., L.I.C. 1, N.Y. for repair or replace-
ment.
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. If desired
you may return the instrument to our factory where it will
be placed In operating condition for $9. 00 plus the cost
of parts replaced dueto 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 yourhome address and the trouble with
the unit. Pack very carefully In a rugged container, us-
ing sufficient packing material (cotton, shredded news-
paper, or excelsior), to make the unit completely immov-
able within the container. The original shipping carton
is satisfactory, providing the original inserts are used or
sufficient packing material inserted to keep the instru-
ment immovcile. Ship by prepaid Railway Express, if
possible, to the Service Dept., Electronic Instrument Co.,
33-00 Northern Blvd., Long Islcmd City 1, New York.
Return shipment will be made by express collect. Note
that acarrier cannot be held liable for damages In tran-
sit If packing IN HIS OPINION, is Insufficient.

Ilgnmmf

7

VOLTAGE CHART
Tub* Sym. *Typ* PI* 2Pin 3Mb 4Pin 5Mn 4PIb 7PIb 8Pin 9
ECC8S Not txcaulbl* DO NOT attangf to manure. So* not* halo*
voltcga* at "FRONT END" toldar lup.
ECH81 -tecvoc -a7VDC GND GND 4.3VAC +170VDC -C.4VDC -0.6VDC
V3 6AU4
V4 4AU6
VS 6BJ7
VS I2AU7
V7 DM70
V8 SX4
•FRONT END*
toldw hip IH
Fig. 3fotlug
numbering.
Sat witch S2to AM ccitloto
Sat witch S2 to FM
QND GND
-0.5VDC GND GND
GND -0. 6VDC GND
150VDC ‘43VDC- *73VDC
-0.4VDC —
195VAC -GND
lag Ilug 2lug 3
4.3VAC WBC GND
rtw>dl"G'
4.3VAC +140VDC +I4CP/DC
4.3VAC +S0VDC +J0VDC
4.3VAC GND -O.A'DC
4.3VAC 4.3VAC +3CVDC
1.2VAC GND -
4.3VAC -19SVAC
lug 4
+140VDC
"-4. CVDC --80VDC "-6.0VDC
1.2VDC -
GND
-0.5 to +0. 5V to 40.4VDC
-3.0VDC t-3. CTVDC
-+1.2VDC GND
—+I40VDC -
2I5VDC --
b) Voltagat nmacwcad allna volt<«* of II7VAC, 40cp*
e) All voltagat may nonaaily vay by aim
d) Marmimanti mod. with VTVM or 20, 000Q/V VOM
•) All moawramaiti mod* to chatIground aid undar no tlgnal condition -tuning
Indicator <* «xtr**m tight 108Mc
•AM petition raadlngt
"VTVM at at loan 2SCW tcala of VOM only
Tub* Sym.* Typ*
RESISTANCE CHART <1
Pin 1Pin 2Pin 3
tin*, Salactor Switch i*t to FM petition)
Pin 4Pin 7Mn 8Pin?
ECH81 2*
4AU4 IS
220K JOCK 2.2K
CAUTION: 8* cartoln to
NOTES: a) A
unit from AC llna bafoia mdclrtg mamutmanh.
uith volunta control tat For maximum cloclrwlt*
id SELECTOR witch to
b) All imawromanti mod* with VTVM or 20, OOOftAf VOM.
c) All ratlahatcoc may nonnolly vary by *20%.
d) All maauramantt mod* with ratpact to chtxtll ground.
a) For platat aid tcraant ratlitcmc* tatt thort B* to ground on
C2Jc, for all tub*t *xc«pt V8 Ractlflar.
8

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