AA-141 Stereo Preamplifier
Features
Elegant in its exciting new styling concept, the Heathkit AA-141 Stereo Preamplifier combines the famous performance of its illustrious predecessor, the Heathkit AA-20, plus the quality appearance and design highlights that make it a perfect match to the Heathkit AJ-11 AM/FM Stereo Tuner. An ideal companion to the Heathkit AA-111 or AA-121 Stereo Amplifiers, the AA-141 provides every modern convenience of stereo system control at lowest cost anywhere!
This quality stereo preamplifier can be used with any basic stereo power amplifier, since it has its own built-in power supply. Output cables are included for connection to the power amplifier, with cathode-follower output circuit design features to assure low loss and installation flexibility in any system.
Four inputs are provided in each channel, eight in all, to accept practically any program source. An RIAA equalized input is provided for magnetic phonograph and a high level input is provided for crystal or ceramic phonograph cartridges. Two auxiliary high level inputs are provided for other program sources such as AM/FM tuners, tape recorder, TV, etc. Controls on the front panel consist of a six-position function selector switch which allows you to hear either channel individually through its own speaker, either channel through both speakers, normal stereo, or stereo channels reversed. Separate concentric volume controls allow individual or simultaneous control of sound intensity of both channels; separate, calibrated Baxandall-type tone controls give you complete command of bass and treble tone quality to suit your individual preference. The input switch selects any of the four input positions provided.
In addition to the cathode follower outputs to the power amplifiers, two high-level outputs are provided for tape recorder, allowing recording directly from the preamplifier. Two 117 volt AC outlets, one switched, one unswitched are provded for auxiliary equipment. Filament balance controls in each channel assure minimum hum and low distortion. Beautifully styled with luggage-tan vinyl-clad steel case and charcoal-gray front panel. An outstanding "buy" in a quality preamplifier at this low Heathkit price!
SPECIFICATIONS—Channels: 4. Inputs: 4 each channel: mag. phono, 47 K ohms; crystal phono, 2.4 megohms; aux. 1 & 2, 500 K ohms each. Input sensitivities: (for 2.5 v rms output) Mag. phono 0.004 v; crystal phono 0.15 v; aux. 1 & 2, 0.2 v. Outputs: 2 each channel, output to power amp. and tape output. Frequency response: ± 1 db from 20 to 20,000 cps. Harmonic distortion: Mag. phono 0.2%, crystal phono and aux. inputs 0.15% at 2.5 volts output. Intermodulation distortion: 0.05% at 2.5 volts output. Hum and noise: Mag phono, 50 db or better, crystal phono and aux. inputs 60 db or better below 2.5 volts output. Channel separation: 45 db or better. Controls: Separate bass and treble controls each channel; 4-position input selector, separate volume each channel; 6-position function switch; filament balance. Tube complement: 5-12AX7. Power requirements: 117 volts, 50/60 cycles. 17.5 watts. External power supplied: 2 AC receptacles, 1 switched 1 unswitched. Color and finish: Panel, charcoal gray; cover, luggage-tan vinyl-clad steel. Shipping Weight: 7 lbs.
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