Model:TK 400 Automatic
Category:Mid High Fidelity
Country of Manufacture:Germany
Release dates:1965 - 1968
Speeds: 3 3/4, 7 1/2
Max Reel Size("): 7"
Number of heads: 2
Head Composition: Permalloy
Head Configuration: Mono - Full Track
Frequency Response:(+3dB -5dB): 7½ ips: 40Hz - 16kHz
Wow and Flutter:0.2 %
Sound quality rating:5 / 10
Long-term reliability rating: 5 / 10
on the same mechanical system as the TK 200, the TK 400 Automatic was,
as its name suggest, a fully automatic recorder.
Speeds of 3¾ and 7½ ips were provided
on this quarter-tack mono machine and spools of up to 7″ could be
Only one recording input was provided, with
an Automatic Gain Control (AGC) and a ‘Speech/Music’ switch giving automatic
recording level (hence the lack of any recording level indicator. In its
place, Grundig provided a three-digit position indicator. A single lever
at the front of the machine provided a unique variable wind-rewind function.
(The AGC system and this variable wind control are described in greater
detail in the 1966 Test Report reproduced below).
Power output was 4 watts into a 3¾ x 4½
Even at £49 7s the TK 400 sold poorly
in the UK and I have heard that mechanically, both it and the TK 200 were
not up to Grundig’s usual standard.
Distortion: 5% maximum / Valve complement: EF86, EF83, ECC81, ECL86, 1 rectifier and 1 diode / Audio output power: 4 watts / Inputs: single input, 2.2 – 45mV across 1.5Mohm / Outputs: external speaker 3-7 ohms, high impedance 700mV / 15Kohm / Speaker(s): 1 x high flux permanent magnet moving coil 3¾ x 4½” / Dimensions: 13¾ x 11½ x 7″ (349 x 292 x 178 mm) / quarter-track mono