Sherwood S-5000

 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)