Stereo Preamplifier AP-1615

• alternative name: Heath Company

The Heathkit AP-1615 offers the kind of specifications and features normally found on preamps costing much more. Harmonic and IM distortion are insignificant, less than 0.05%. And extremely wide dynamic range, 100 dB for all inputs, means that even the loudest and most complex musical passages come through with minimum distortion. For tonal
balance, the optional AD-1305 offers far more versatility and precise tone adjustment than ordinary bass and treble controls. A relay instantly mutes the output when power is turned on or off to prevent "thumps." A sub-sonic filter eliminates the noise from turntable rumble or record warp. Has high-frequency filter, two phono inputs, aux. and tuner inputs, tape monitor, mono switch, headphone jack and front panel dubbing inputs and outputs. Handsome styling too, with brushed aluminum front panel, black metal top and solid walnut end panels.         The AP-1615  is an easy kit to build. Parts mount on a single printed circuit board, and point-to-point wiring is kept to a minimum. Even if you're a first-time kit builder, you can build a better preamp than you probably thought you could afford. 

AP-1615 SPECIFICATIONS: Input Sensitivity: Phono, 2 mV. 141-Level 180 mV. Input Overload: Phono, over 100 mV, Hi Level, over 10 V. Hum and Noise: Phono, —65 dB (2 mV
input); Hi-Level —85 dB (180 mV input). Frequency Response: Phono. 0.5 dB, 30 Hz to 15 kHz. Hi-Level. .2 dB, 20 to 20 kHz. Rated Output: 1.5 V at rated sensitivity,                       Tape Output: 180 mV. Channel Separation: 50 dB at 1 kHz. 

Here you find 775 models, 758 with images and 515 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Heathkit (Brand), Heath Co.; Benton Harbor (MI)