Ashly INSTRUMENT PREAMP SC-40 - Manual (Page 2)

I. INTRODUCTION
The Ashly Audio model SC-40 instrument preamp was designed
to help solve some of the problems associated with modern
electronically reproduced music. In particular, it provides
a means of performing the critical first stage of amplification
for a wide variety of musical instruments with an absolute
minimum of noise and signal loss, has provision for the connection
of studio type line-level effects devices, operates with either
line-level power amplifiers or musical instrument amps, and
includes a direct output with a separate level control for
connection to studio or PA console microphone inputs.
Tone control is accomplished using a sophistocated 3-band
tunable equalizer borrowed from our large mixing consoles
making possible a wide range of voicings.
A "peak" indicator warns of approaching overload anywhere
in the preamp and the overload characteristic is one of "clean"
clipping free from spikes or transients.
II. INPUT, OUTPUT, AMD POWER CONNECTIONS
The preamp should be connected to a 3-wire grounded outlet
supplying 120 Volts, 50-50 Hz. Power consumption is 5 watts.
Except for the mic-level PA output, all input and output
connections are standard 1/4" phone jacks v/hich mate with
a standard phone plug such as a Switchcraft model 280. The
mic-level PA output is a 3-pin male XLR connector and is
wired as follows:
Pin 1 Ground
Pin 2 Signal low
Pin 3 Signal high
III. FUNCTIONS OF INPUTS AND OUTPUTS
A. INPUT
The front panel input impedance is 2.2 megohms which will
impose virtually no load on any musical instrument, insuring
maximum level and high frequency response. Nominal operating
level is -20 dBV, but levels from -50 to +10 dBV provide good
results. Low or high impedance sources are acceptable.