Grundig TK-340 (circa 1966–1967)
The Grundig TK-340 is a quarter-track stereo tape recorder with built-in amplifiers and side-facing speakers. It's a self-contained home deck from the mid-1960s. It runs at three speeds (7½, 3¾, and 1⅞ ips) and has automatic level control, which was still new on consumer machines at the time. Studio Sound (April 1967, p.43) published the manufacturer's specification. Wow and flutter measured 0.1%, 0.12%, and 0.2% across the three speeds. Frequency response was rated at 40 Hz - 12 kHz at the highest speed, dropping to 40 Hz - 10 kHz at 3¾ ips.
The TK-340 had amp, earphone, and speaker outputs, plus a built-in recording-level meter and automatic level control. High Fidelity (November 1966, p.139) noted the machine weighed 25 lb and could handle 4-track mono and 4-track stereo operation. It also lists 8-track, presumably for playback, though details are thin. A separate reference in Amateur Tape Recorder (August 1966, p.28) mentions an output of 800 mW from the built-in amplifier.
Surviving documentation on the TK-340 is limited to these period reviews. No service manual, original sales literature, or production timeline appears to have surfaced in the usual collector channels. Going by the review dates, it was on the market from at least late 1966 through 1967.
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