Country of Manufacture:Germany
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 25 was from the same family as the TK20 and TK24. It was meant to offer that little bit extra over the TK20, a single speed (3¾ ips) mono machine. The TK 25 had two speeds plus a fader control, enabling mike to be faded to either diode or radio input. It also featured a superimpose button for sound-on-sound. In addition, the TK 25’s motor was multi-pole and driven from a 42V AC winding on the mains transformer. In most other respects though, the recorder was identical to its classmates. 5¾-inch spool capacity, 3-digit counter, EM84 magic ribbon level indicator, 2½ watt audio output, and 3¾ x 5½” high flux internal speaker. Unfortunately, the TK25 wasn’t very popular and did not sell widely. which explains why it is seldom seen today. Price when new in the UK was £65 2s.
Bias frequency: 75kHz / Valve complement: EF86, ECC81 (12AT7), 2 x EL95, EM84 and 2 metal rectifiers / Audio output power: 2½ watts / Inputs: microphone (2mV / 500Kohm) diode (8.5mv / 44Kohm) radio (80mv / 1Mohm) / Outputs: external speaker 3-7 ohms external amplifier (high impedance output, 700 mV / 10 Kohm / Speaker(s): 1 x high flux permanent magnet moving coil 3¾ x 5½” / Dimensions: 14 x 12½ x 7½” (355.6 x 317.5 x 190 mm) / Weight: 25 lbs (11.36 kg) / half-track mono