Digital Stereo Tuner AJ-2520

• alternative name: Heath Company

Easy enough for the beginner yet challenging enough for the experienced kit builder, the AJ-2520 gives you a unique opportunity to understand your stereo tuner inside and out.
The 2520 guarantees optimum sound quality with a digitally synthesized, quartz-locked tuning system that uses a combination of a digital frequency control system and a highly accurate quartz reference crystal. The control system automatically locks onto the assigned frequency of any broadcast and compares it to the reference frequency 25,000 times per second. The result is not just automatic centering, but drift-free reception, as well. Also, an all-metal chassis helps maintain audio signal purity by providing shielding and noise rejection.
With 16 station FM or AM memory, you’ll have plenty of room to program all of your favorite frequencies. And, should a power failure occur, station memory is retained for up to one week.
When Harman Kardon specially designed for Heath the 2520 Tuner, they used meticulous care in circuit layout and component selection to help minimize harmonic distortion and cross-coupling. A Low Group Delay I.F. (Intermediate Frequency) section makes for even lower distortion and wider stereo separation.
Other features include a 3-segment LED signal strength meter, muting, manual up/down tuning, bi-directional tuning and tuned indicator. Dimensions are 2¾"H x 17½"W x 14¼"D.

Specifications: Usable FM Sensitivity: 10.8 dBf/0.95 µV. 50 dB Quieting Sensitivity: 37 dBf mono, 19.4 µV stereo. THD: 0.2% mono, 0.3% stereo. S/N: 82 dB mono, 74 dB stereo. Capture Ratio: 1.3 dB. Alternate Channel Selectivity: 50 dB. Power Supply: 120 VAC, 60 Hz. Power Consumption: 14W.

Assembled:   AJW-2520 ........................................... $249.00 USD.

Here you find 816 models, 799 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)