Sherwood S 2100 Sevice Manual

Page 1

SHERWOOD

MoDEL 5-2100
FM/MX-STEREO/AM TUNER
OPERATION, INSTALLATION,
and SERVICE MANUAL

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With your purchase of Sherwood High Fidelity
equipment, you joinan ever-increasing group of proud
Sherwood owners. To increase your appreciation of
the many operating and performance features designed
into every Sherwood product, this operating manual
has been prepared. We urge you to read the entire
manual carefully in order that you may benefit from
these features.

Although many operating refinements have been inv
cluded which initially may not seem essential to the
operation of your equipment, further experience in
good listening invariably results in your appreciation
of these refinements provided by Sherwood. Conse»
quently, we suggest you save this manual for reference
to the valuable information contained herein.

SEE PAGE '5 FOR SIMPLIFIED IIOOKUP A? OPERATING PROCEDURE

Main Puwev Swnch and
Seleztm for FM 0v AM
broadcast band

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Stereo'hte, Indxcules FM
stereo mulvnplex nunsmIssIon.

FM and AM Inning knob

SHERWOOD MODEL 5-2100
FM/MX-S'I'EREO/AM TUNER

AM selectwny nth.
Normally set to left, will
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Page 2

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FM INTERMODULATION
DISTORTION

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RESPONSE [N DECIBLES

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FM
50 SELECTIVITY
CHARACTERISTIC
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FREQUENCY IN KILOCYCLES

MODEL 5-2100 FM/MX-STEREO/AM TUNER SPECIFICATIONS

CmCUITS: FM-Low-noise balanced antenna input transformer feed-
ing cascode RF amplifier. Pentode mixer, 2 IF amplifiers, gated-beam
limiter, 2nd limiter, and ratio detector. Delayed AGC applied to RF and
IF stages. AFC on oscillator. Inter-channel noise muting with rear-
panel control. FM multiplex circuitry with FM stereo-lite indicator.
AM-Superheterodyne with two tuned RF circuits, penragrid mixer.
double-tuned IF stage with switched coupling, and low~distortion diode
detector. Separate diode for delayed AVC which is applied toRF, mixer,
and IF stages. Directable ferrite-rod antenna. Split-bar tuning eye for
both FM and AM. '
TYPICAL SENSITIVITY: FM- 0.95 uv for 20 db. quieting. AM- 2.0uv
@ 60% mod. Ior 0.5V output, Sdb. S/N

IHFM FM SENSITIVITY: ........ l.8uv for 30 db, noise 8: distortion
below 100% FM

TYPICAL SELECTIVITY: . . . . FM- 200kc @ -3db. AM-(wide) l5kc
@ -6db. (narrow) 51m @ -6db.

FM DETECTOR: ...................... lOOOkc. peak-to-peak
TUNING RANGE: ............ FM, 87.5-108.5mc. AM, 535-1630kc
FREQUENCY RESPONSE: ...... FM monaural 20-20,000 cps 11/2 db.

FM stereo, 20-15,000 cps 11/2 db.
AM, (wide 20-7,500cps @ -6db.)

DISTORTION: . . . . FM, less than 1/3% IM @ 100% mod. (60c/7kc: 4/1
w/std. preemphasis) less than l/4%
harmonic @ 100% mod., 400 cps

FM STEREO SEPARATION: . . 40 cps to 12kc; 40 db. typical, 30 db. min.

HUM AND NOISE LEVEL: ........... FM, 60 db. below 100% mod.
AM, 55db. below 100% mod.
FM DRIFT: ...................... 5kc w/AFC, 25k: w/o AFC

CONTROLS (rear panel): I-Iush adjust, AM level, Stereo FM level, Bal-

ance, Separation, Stereo-lite sensitivity
AFC CORRECTION: . . . . ................ 15 db. (5/1 or 80%)
NOISE MUTING CONTROL RANGE: Odb. to -40 db. audio reduction

OUTPUT: . ..................... 1.2 Volts @ 100% modulation
OSCILLATOR RADIATION: ......... 3 db. below FCC requirements
ANTENNA: . . . . FM- 300 ohm balanced, AM-directable ferrite rod,

w/external ant. connection
OUTPUTS: ......................... Low-impedance audio
POWER CONSUMPTION. . 0.98, 85 watts, 115-125v, 50450 cps
DIMENSIONS: ....................... 14 X 10-1/2 x 4 in. high
SHIPPING WEIGHT: ...................... 21 lbs. (with case)

MODuLnIuN

FM
LIMITING
CHARACTERISTICS

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