The
"new" Sherwood S-5000 dual amplifier preamplifier makes possible
either stereo or monaural high-fidelity systemoperation with only one set of
basic coordinated controls, yet offers every important control feature
essential to both stereo and monaural operation. These include 10 two-channel
controls, stereo normel/revers switch, phase inversion switch, and dual
amplifier monaural operation with either set of input sources. The five modes
of operation; stereo, stereo-reversed, monaural 1, monaural 2, monaural 1 + 2,
are selected by the function switch which also operates a corresponding group
of indicator lites to identify the selected operating mode.
All controls
operate both channels simultaneously. In addition, the bass and treble controls
feature friction-locked shafts which also allow the adjustment of one channel
separately from the vertical rumble and noise components balanced out. A tape
monitor switch permits instant comparison of recording input signal to tape
with recorded output from tape when used with recorders offering monitor heads.
Special
features:
Stereo-monaural
indicator lights
Dual/single
bass and treble control
Compensated
ganged loudness control
Plays
monaural records with vertical rumble and noise balanced out
Stereo
normal/reverse switch
Phase
inversion switch
Ganged
presence rise switch
Ganged phono
and scratch filter switches
Ganged tape
monitor switch
Stereo
balance controls both channel
Six high
level inputs
Four
phono/tape preamp inputs
3rd channel
output
Two tape
monitor inputs and recording outputs
Speaker
damping factor selection
Color coded
cables and receplacles
The Model
S-5000 also can be used as a 40 watt monophonic "starter" system
planned for later conversion to a 20 + 20 watt stereophonic system. The
interchange from a 40 watt single amplifier to a 20 + 20 watt dual amplifier is
accomplished by a single front panel switch. This circuit connection features
the full sum of the 2 separate amplifierrs' outputs instend of using the
power-robbing parallel connection commonly used.
All Sherwood
amplifier now provide selectable damping factors of 10/1 (normal) or 2/1 (for
use with today's popular compact speaker systems).
The Sherwood
S-5000 Function Selector operates its associateed indicator lites to identify
the source-speaker combination selected. This exclusive feature, which also
serves as the off-on pilot lite, tells at a glance which stereo or nonaural
function has been selected as shown in the chart at right. Note especially the
last position, :Mono S1 & 2" which connects a stereo phono pickup in
such a manner that the vertical rumble and scratch components are balanced out
for use with monaural records.
Important
aids to flexibility of stereo system operation are the bass and treble controls
included in the Model S-5000. each control features friction locked dual knobs.
With normal usage, the main knob on each control operates both left and right
hand channels simultaneously due to its
friction-locked concentric shafts. In addition, one channels tone may also be
adjusted independently of the other. This is possible, because the 2nd-channel
indicaqtor knob can also readily be adjusted without moving the 1st-channel
knob as permitted by the friction -locked shafts. Afyer this independent
adjustment, both channels are again
automatically ganged together for simultaneous operation by the main knob
without upsetting the inter-channel relationship selected.
Specifications:
Power
Output:
Monaural
: 40 watts (80 watts peak) at 1½ % IM
distortion.
Stereo
: 20 + 20 watts (40 + 40 watts peak) at ½% THD or 1½%IM distortion
Outputs: 16, 8 and 4 Ω for left and right speaker, 2 cathode follower recording outputs
Inverse
Feedback: 18 dB
Damping
Fcator: 10 : 1 normal
Frequency
Response: 20 cps to 20 kc ±0,5 dB (at 20
+ 20 watts)
Tone
Control Response: flat Setting, 20 cps
to 20 kc ±½ dB
Tone Control
Range:
At 15 kc
: 20 dB boost or cut
At 40 cps
: 16 dB boost, 19 dB cut
Rumble
Filter:
At 27 cps
: 18 dB rejection
At 100 cps
: less than 1 dB down
Preamp
Equalizer Curves:
RIAA
phono; NAB tapehead, others w/tone
controls
Controls and
Switches (all controls and switches operate both channels):
Loudness
control w/loudness compensation switch, dual/single bass and treble controls,
stereo balance, presence rise, rumble-filter, and scratch filter switch, phono
level, function switch selector switch, tape monitor switch, and output tube
balance.
Balance
Control range: ±45 dB
Interchannel
Crosstalk: less than -50 dB at 1 kc
Sensitivity:
Tuner : 0,20 V
Phono : 2 mV (adjustable with phono level control)
Max. Input
Capability:
Tuner : 10 V for less than 1% IM distortion
Phono : 200 mV for less than 1% IM distortion
Max. Hum and
Noise (volume controlat min. 90 dB weighted below rated output.)
Tuner
Input (controls max.): 80 dB (weighted) below rated output
Phono Input
(control flat): 60 dB below rated
output; 72 dB below 10 mV
Power
Consumption: at 110 - 120 V, 60 Hz is 110 W
Dimensions
(W x D x H): 14 x 13 ½ x 4 inch
Weight: 29 lbs (shipping)