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Sound Rating: 6 / 10 # Owners: 1
Relaibility Rating: 7 / 10 Views: 434

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Technical Details

Brand: Grundig

Model:TK 20 / TK24





Country of Manufacture:Germany

Release dates:1960 - 1964

Original Price: $65

Tracks:1/4 Rec/PB

Speeds: 3 3/4

Max Reel Size("): 5"

Number of heads: 2

Dimension: 14 x 12½ x 7" (355.6 x 317.5 x 178 mm)

Head Composition: Permalloy

Head Configuration: Mono - Half-Track

# Motors: 1

Auto Reverse?:No

Voltage(s): 220-240v

Outputs: RCA

Frequency Response:(+ 3, -5 dB) 60Hz - 12kHz

Wow and Flutter:0.2 %

Signal-to-Noise Ratio: 40 db

Sound quality rating:6 / 10

Long-term reliability rating: 7/ 10

Weight: 20 lbs

Additional Details


The TK20 is a half-track mono recorder with a single motor, 2 heads and a maximum reel size of 5¾”. Physically, it’s identical to its quarter- track brother, the TK 24. Transport functionality is controlled by the left hand rotary knob (clock-wise selecting rewind, stop, play, record and fast forward). There’s a built-in safety record lock by which recording will only be permitted when one of the three input selector buttons on the right hand side of the machine are pressed simultaneously with the record mode being selected.The knob on the left controls volume, tone, speaker on/off switch and mains power.  A three digit tape counter, magic eye level control and track selector (on the TK24) complete the physical layout of the machine’s various controls and indicators.

Additional Info

Year 1960
Price when new (in the UK) £65 2s (TK 24); £54 12s (TK 20)
Track system Quarter-track mono (TK 24); half-track mono (TK 20)
Heads Two
Motors Single motor (outer rotating cage split phase induction)
Maximum reel size 5¾ ”
Tape speeds 3¾ ips
Frequency response (+ 3, -5 dB) 60Hz – 12kHz
Wow & flutter 0.2 %
Signal to noise ratio 40 db
Bias frequency 75kHz
Valve complement EF86, ECC81 (12AT7), 2 x EL95, EM84 and 2 metal rectifiers
Audio output power 2½ watts
microphone (2mV/500Kohm)
diode (8.5mv/44Kohm)
radio (80mv/1Mohm)
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 7″ (355.6 x 317.5 x 178 mm)
Weight 20 lbs


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