The AA-903 amplifier
A completely new Amplifier of the Williamson type combining the best features of our popular, low-priced Amplifier and our self-powered Preamplifier. This extremely versatile unit is an excellent companion piece for our famous Pilotuners
Features
Self-contained power supply for 117 volt, 60 cycle AC line
Detachable front panel plate for convenient custom installation using up to 3/8" wood panel
Full bass and treble controls with "flat" positions at center settings of control knob
Selector switch to choose signal from any one of 4 playback equalizer
Output Transformer is made with Interleaved Winding for Reduced Leakage Inductance
Supplied with removable rubber feet and thru-chassis mounting screws and washers
Seven position switch selects 1 of 4 input channels and 1 of 4 phono equalizers
Williamson type circuit for use true High Fidelity
Convenience Outlet, controlled by On-Off Switch
Attractive gold finish chassis impervious to fingerprints
Specifications
Tube Complement:
12AX7 - preamplifier
12AX7 - Tone Amplifier
6C4 _ Voltage Amplifier
12 AU7 - Amplifier and Phase Inverter
6V6GT - (2) Power Amplifier
5Y 3GT - Rectifier
Power Output: 10 Watts maximum
Sensitivity (For 1 Volt output)
Phono : 10 mV
Radio, Aux I, Aux II : 150 mV
Input Impedance
Radio, Aux I, Aux II : 300 Ω
Phono, : adjust from 6,800 to 100,000 Ω
Frequency Response: 15 cps to 40,000 cps ± dB at rated output (10 Watts)
Hum Level: 80 dB below 1 Volt
Total Harmonic Distortion
Less than 1% at 10 Watts from 30 cps to 15,000 cps
0,1% at 1 Watt from 30 cps to 15,000 cps
Intermodulation Distortion : less than 2% at rated output (50 and 7,000 cps : 4 /1)
Output Internal Impedance: 1 Ω at 8 Ω
Negative Feedback: 15 dB
Tone Control Range
18 dB Boost /18 dB Cut at 20 cps
11 dB Boost / 11 dB Cut at 100 cps
0 dB Boost / 0 dB Cut at 800 cps
14 dB Boost / 15 dB Cut at 10,000 cps
18 dB Boost / 18 dB Cut at 20,000 cps
Speaker Output Impedance: 4, 8 and 16 Ω
Power Consumption: 75 Watts, 117 Volts. 60 Cycles
Overall Dimensions (W x H x D): 12" x 7" x 8-3/4"
Shipping Weight: 15 Pounds
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