LENCO R25 - Technical Data; Amplifier Section; FM Section; AM Section

Lenco R25
The R 25 receiver conforms to the most recent technical de-
velopments. Its functional design includes arrangement of all
operating controls for convenient operation.
Technical Data
Amplifier Section
Nominal Power, 8
Distortion at 1 KHz with
output from both channels, 19 W
Frequency Response
Power Bandwidth
Sensitivity, Phono
Equalization, Phono
Sensitivity, Microphone
Sensitivity, AUX, TAPE
Treble Control
Bass Control
Loudness
Weighted S/N Ratio, to DIN
— Phono
— AUX, TAPE
Cross Talk
2x19W
0.5 %o
10—40,000 Hz
20—20,000 Hz
2.5 mV / 50 k22
RIAA + 1.5dB
2.5 mV /50 kQ2
160 mV/50kQ2
+10dBat 10kHz
*+10dBat100 Hz
+ 7dBat100 Hz
+ 4dBat 10kHz
=> 60 dB
> 62 dB
= 52dB at 1kHz
> 33 dB at 10 kHz
General Troubleshooting Chart
lf{the set is otherwise operating satisfactorily, the more com-
mon causes of trouble may be generally attributed to the fol-
lowing:
1. Incorrect connections or loose terminal contacts. Check
the connection of speaker, record player, tape recorder,
antenna and power cord.
FM Section
Antenna Connections
Tuning Range
Sensitivity (mono, 60 Q input,
26 dB S/N A f = 40 kHz)
Limiting level
Distortion, mono
S/N Ratio (mono, input 1 mV)
Capture Ratio
IF Rejection
Image Rejection
Frequency Response
Channel Separation
Stereo switching level
AM Section
Frequency Range MW
Sensitivity (S/N 20 dB)
Distortion
240—300 22 Sym.
60— 75 Q Asym.
87.5—108 MHz
1.8 vV
1.5 nV
0.2 %
> 55 dB
1.5 dB
= 90 dB
= 80dB
20—15,000 Hz
= 40 dB
5 uv
525—1650 kHz
30 uV (ant. input)
2 %o
Image Rejection = 45 dB
S/N Ratio = 45 dB
General Data
Power Consumption 150 W max.
Dimensions 490 x 390 X 132 mm
Weight 11 kg
2.
Improper
operation.
Before
operating
any
audio
com-
ponent,
be
sure
to
read
the
manufacturer's
instructions.
3.
Improper
location
of
audio
components.
The
proper
posi-
tioning
of
components,
such
as
speakers
and
turntable,
is
vital to stereo.
4.
Defective
audio
components.
The
following
are
some
other
common
causes
of
mailfunction
and
what
to
do
about them.
Program Sympton Probable cause What to do
AM,
FM,
1.
Constant
or
intermittent
1.
Discharge
or
oscillation
caused
by
__1.
Attach
a
noise
limiter
to
the
electical
MPX
noise
heard
at
times
or
electrical
appliances,
such
as
appliance
causing
the
noise,
or
io
the
reception
in
a
certain
area
fluorescent
lamp,
TV
set,
D.C.
motor
amplifiers
power
sources
rectifier
or
oscillator
2.
Install
an
outdoor
antenna
and
ground
the
2.
Natural
phenomena,
such
as
set
to
raise
the
signal-to-noise
ratio
atmospheric static or thunderbolts 3. Reverse the power cord plug
3. Insufficient antenna input due to 4. If the noise occurs at a certain flequency,
ferroconcrete wall or long distance attach a wave trap to the antenna input
from
the
station
5.
Keep
the
set
ata
proper
distancs
from
4. Interference from other electrical other electrical appliances
appliances
2.
The
needle
of
the
signal
1.
The
set
is
located
in
a
weak
signal
1.
Place
the
set
to
receive
maximun
signal
and tuning meter does area strength
not
move
very
much
2.
An
FM
or
TV
broadcasting
station
2.
Ground
the
set
to
the
earth
is near at hand
3.
The
zero
point
of
the
1.
Regional
difference
in
field
intensity
1.
The
unit
is
not
at
fault
meter not stable
AM
1.
Noise
heard
at
a
particular
1.
Due
to
the
nature
of
AM
broadcast
1.
In
some
cases,
the
noise
can
be
reception
time
of
a
day
in
a
certain
eliminated
by
grounding
the
setor
area of any part of dial
2. High-frequency noise
1. Adjacent channel interference
or beat interference
2. TV set too close to audio system
3. Broadcasting interference 1.Antenna’s input sensitivity is too
strong
i A
1.
reversing the power cord plug-rceptacile
connections
Although
such
noise
cannot
bedi
minated
by
the
set,
itis
advisable
to
adjut
the
TREBLE
control
from
midpoint
>
lett
and
switch
on
the
HIGH
FILTER
2. Keep the TV set at a proper distrace
1.
from the audio system
Connect resistor (1K-10K) in serezs
to antenna terminal