Category:Mid High Fidelity (most Japanese recorders fall into this category)
Country of Manufacture:Germany
Release dates:1960 - 1963
Speeds: 1 7/8, 3 3/4
Max Reel Size("): 7"
Number of heads: 2
Head Composition: Permalloy
Head Configuration: Mono - Full Track
Frequency Response:(+ 3, -5 dB): 60Hz - 15kHz at 3¾ ips. 60Hz - 8kHz at 1 ips
Wow and Flutter:less than 0.25 % at 3¾ ips. less than 0.4% at 1 ips
Signal-to-Noise Ratio:better than 45 db
Sound quality rating:5 / 10
Long-term reliability rating: 5 / 10
The TK 28 was from the same family as the TK20 and TK24.
Features included easy front-panel switching of speeds, 3-digit resettable tape position indicator, Trick recording (sound-on-sound), mixing of inputs, dual-track playback, push-pull 2.5-watt EL95 output, 5.9″ ( 15 cm) reel capacity and EM 84 magic ribbon record modulation indicator.
Not produced for the US or UK export market, price when new in Germany was 561 DM.
Bias frequency: 75kHz / Valve complement: EF86 x 2. ECC81 x 2. EM84. EL95 x 2 selenium rectifier / Audio output power: 2½ watts / Inputs: microphone (2mV / 500KΩ) diode (8.5mv / 44KΩ) radio (80mv / 1MΩ / Outputs: external speaker 3-7Ω external amplifier (high impedance output, 700 mV / 10 KΩ / Speaker(s): 1 x high flux permanent magnet moving coil 3¾ x 5½” / Dimensions: 14 x 13.2 x 7.3 inches (355 x 335 x 185 mm) / Weight: 25.3 lbs (11.36 kg) / quarter-track stereo