Model:TK 820 “Specialist”
Country of Manufacture:Germany
Release dates:1955 - 1958
Speeds: 3 3/4, 7 1/2
Max Reel Size("): 7"
Number of heads: 2
Head Composition: Permalloy
Head Configuration: Mono - Full Track
# Motors: 1
Frequency Response:( 3 dB): 7½ ips: 40Hz - 14kHz
Sound quality rating:3 / 10
Long-term reliability rating: 7 / 10
From the 1955 service manual:
The “Specialist” TK 820 is a portable Tape Recorder capable of recording on 1/4″ magnetic tape. The
machine is a dual track recorder and is able to record and play back in both directions. It operates at the two tape speeds of 3¾ ips and 7½ ips. The Electro-Magnetic change over from track one to track 2 position takes less than one second at 3¾ ips and four seconds at 7½ ips.
Drive is obtained from a split phase induction motor. Input selection selection is made by means of a three-position switch.
Valve complement: EF 86, ECC 81, EL 84, EL 43, EM 71 / Rewind speed: approximately 1½ minutes / Speaker(s): three speakers built into cabinet / Dimensions: 17 x 17½ x 9½” (432 x 444.5 x 241.5 mm) / Weight: approx 46 lbs (21 kg) / half-track mono