Eico HF 60 Owners Manual

Page 2

MODEL HF50 a. HF60 AbDENDA (Book'fllfiggq)

Page 6 indicates that the HF5O and HF60 can operate safely with line voltages up to l24 volts
and recommends the use of a voltage adiusting device when line voltages exceed this value
(paragraph '3). The power transformer now provided permits the use of this instrument on line
voltages up to 132 volts without component failure being likely. If your line voltage is 121 volts
or less, connect the black-red lead to the fuseholder. Tape up the exposed and of the loose
black-green lead and tape this lead with friction tape to the black-red lead so that it does not
hang loose in thechassis.

If your line voltage is between 12] volts and 132 volts, connect the black-green lead to the
fuseholder. Tape up the exposed and of the loose black-red lead and tape this lead with
- triction tape to the block-green lead so that it does not hang loose in the chassis. If you are

I13: 7 certain as to your line voltage, or think that it may be high, connect the black-green lead

., to the tuseholder and tape up the black-red lead as above. For voltages exceeding 132 volts
a voltage regulator or adiusting device must be used. However, line voltages exceeding
132 volts is unlikely.

When adiusting the bias and balance controls, adiust the line voltage to 117 volts if the black-
red lead ls connected to the fuseholder, and 125 volts if the black-green lead is connected to the
fuseholder (page 5).

Please made the following changes in the construction hook if you are building this unit from
a kit:
(A) if your line voltage is less than 12! volts, step 7 on page 7C should read:
7. ( ) Fig. 3. Cut the black lead from hole "Y to 3 and connect to J5'i (C).
WI, \ ' Cut the black-red lead to 5 V2" and connect to XFi-l (5). Tape the exposed
0 end of the black-green lead to insulate this wire and tape the lead to the black-
red wire so that it does not hang loose.

(D) If your line voltage is greater than 12] volts, step 7 on page 7C should read:
7. ( ) Fig. 3. Cut the black lead from hole IIY" to 3" and connect to J5i (C).
Cut the black-green lead to 5 1/2" and connect to XVI-i (5). Tape the exposed
and of the black-red lead to insulate this wire, and tape the lead to the black-
green wire so that it does not hang loose.

LE. 1089 Electronic instrument Co., Inc., 33-00 Northern Blvd., L.I.C. l, New York

Page 5

rE'Aruni's

t. EF86 phenomenally low-noise, high gain, voltage
preamplifier.

2. Direct coupling between voltage preamplifier and phase
inverter to eliminate a time constant.

3. 65N7 GTB cathode-coupled (long-tailed") phase in-
verter for forced balance over the entire frequency and
dynamic range. Provides drive for the output stage from
equal and comparatively low impedances.

4. El34/6CA7output pentodes in a path-pull Ultra-Lin-
eor output stage operating with fixed bias.

5. Fuily potted ACRO TO'330 Output Transformer._the
"heart" of the amplifier_ provides a level of performance
previously thought unattainable or a competitive price.
It is manufactured from the finest and costliest material:
on special winding equipment, uslng unique, patented
design methods. Each transformer is extensively tested
and a-c balance is guaranteed to 1%.

6. Heavy duty power tromformer with reserve capacity

SPECIFICAHONS

Rated Output Power: 60 watts continuoul; 130 watt: peak.

for powering any preamplifier.

7. Extra-rugged 6234 rectifier tubewith indirectly heat-
ed cathode to eiiminate high starting voltage on the e-
lectrolytic filter capacitors and to delay the application
of the full 8+ voltage to the amplifier tube: until they
have warmed up.

3. Input level control.

9. Fure and panel mount fuse holder.

IO. Control of bias voltage for output tubes.

ll. DC Balance adlultrnent of output tubes; convenient
metering terminal: provided.

12. Standard ectal socket provided for preamplifier power
twine-off and remote on-off switching.

13. Switched and unswitched AC convenience autieh.

14. Heavy gauge steel chassis.

IM Diltortion 160 8. 6000 cps at 4: ll: Below 1% at 60 wom; below 0.5% at 50 wuttt.

Total Harmonic Distortion: Below 0.5% at any frequency from 20 ope to 20 kc within 1 db of 60 watts.

Undistorted Sinusoidal Frequency Response: $0.5 db 5cm to lOOkc at l watt level; tOJ db 15cps to 35 k: at any level
from i milliwatt to 60 watta; no peaking or raggedneu outside audio range.

Sguare Wave Resmnse: ZOCP to 25 kc essentially undistorted; 3mlcm-eecand! rise tlme; no overshoot at any frequency or
power level not visible rounding below l5kc.

lnvene Feedback; 21 db

Stability Margin: 16 db

Damping Factor: Above 12, 20cm to 20k; 17 at lkc.
Sensitivig: 0.52 volt for 60 watt: out.

.lifll'; 90db below rated output

Speaker Connections; 4, 8, and lo ohms

[ubeu 2" EL34/6CA7, i' EF86/Z729, 1" 65N7GTB, 1 6134

Power Source: 110-120 volts, 60 cycles; i50va at no ignal, 200w: at Ilgnal developing rated power, 250w: at signal

developing peak power (overload); 3 amp fun.

fills: HWD 7" X 14" X 8"

Welght: 30».