Grundig TK 244

The Grundig TK 244 (also known as TK244 Hi-Fi or TK 244 U in export/schematic variants) is a high-end solid-state open-reel (reel-to-reel) tape recorder produced by Grundig Radio-Vertrieb in Fürth, Germany. Manufactured primarily from 1969 to around 1972, it was a premium consumer stereo machine aimed at audiophiles and serious home users. It was designed to meet DIN 45500 hi-fi standards, featuring quarter-track stereo, three heads, two tape speeds, automatic/manual recording modes, and versatile operation (horizontal/vertical).

The TK 244 was priced originally around 800–1,000 DM (a high-end consumer figure, equivalent to roughly £80–100 in export markets), positioning it as one of Grundig's top-tier stereo models in the late 1960s/early 1970s. It gained strong collector interest for its low wow & flutter, wide frequency response, and reliable performance, often praised as a "Hi-Fi" benchmark in Grundig's solid-state era.

Key Technical Specifications

Track System: 4-track (quarter-track), 2-channel stereo / monaural (stereo record/playback; monaural operation also supported; records on one quarter-track per pass, allowing four tracks total on standard tape by flipping reels twice)

• Tape Speeds: Two speeds — 9.5 cm/s (3¾ ips) and 19 cm/s (7½ ips); switch-selectable (higher speed for high-fidelity music, lower for extended runtime)

• Reel Size: Maximum 18 cm (7 inches); commonly used with 13–18 cm reels; supports standard NAB/international hubs

• Heads: 3 heads — separate erase, record, and playback (permalloy construction; allows real-time off-tape monitoring during recording, a key hi-fi feature)

• Motors: 1 motor (capstan drive; single-motor design with mechanical reel assistance; high-quality induction motor typical of late-1960s/early-1970s premium consumer machines)

• Drive System: Mechanical transport with push-button controls; constant tape speed; foil-sensing automatic stop at tape end; advanced tension regulation suitable for standard and thinner tapes; additional features include automatic/manual/trick recording modes, horizontal/vertical operation, two microphone inputs, and tape-end shutdown

• Frequency Response (all ±3 dB):30–20,000 Hz at 7½ ips
  30–15,000 Hz at 3¾ ips (excellent for the era, especially at 7½ ips; meets DIN 45500 hi-fi standards with wide bandwidth and good extension)
  

• Signal-to-Noise Ratio: Better than 55–60 dB (weighted; excellent for mid-1960s/early-1970s consumer stereo, aided by separate playback head and low-noise solid-state circuitry)

• Wow & Flutter: Less than 0.07% at 9.5 cm/s; less than 0.1% at 19 cm/s (outstanding for domestic use; among the lowest figures in Grundig's lineup, thanks to precise drive)

• Equalization: IEC/CCIR/European standard for the period (some export versions note NARTB compatibility)

• Inputs:Microphone: Low-level (two inputs; dynamic mic via DIN or proprietary socket; often supplied external mics)
  Line/Radio: High-level via DIN connector (Grundig 5-pin standard)
  Phono/Grammophon: Additional high-level input for record players
  

• Outputs: Built-in loudspeakers (high-flux elliptical permanent-magnet dynamic type); low-impedance ext. speaker; high-impedance line out (stereo preamp output for external amplifiers) via DIN socket; output power ≈4–6 watts (internal stereo amp)

• Power Supply: Alternating Current (AC) mains — 110–240 V (multi-voltage taps for export); power consumption around 60–90 W; no battery option (mains-only domestic/portable hybrid)

• Dimensions: Approximately 430 × 165 × 360 mm / 16.9 × 6.5 × 14.2 inches (W × H × D) — compact low-profile table model (horizontal/vertical operation)

• Weight: Approximately 12–14 kg / 26–31 lbs — substantial due to metal chassis, 3-head assembly, and stereo components

• Electronics: Fully solid-state (transistor-based; 21 transistors reported in some sources; no tubes, marking Grundig's shift to transistorization in hi-fi models; includes automatic/manual/trick recording modes)

• Other Features: Recording level indicator (VU meter or glow type); mechanical tape counter; automatic tape-end stop; pause function; automatic/manual/trick recording; two microphone inputs; horizontal/vertical operation; recording time up to 8–16 hours total (depending on speed, tape thickness, and track usage) on 7-inch reels with long-play tape

Design and Performance Notes

The TK 244 was a high-performance stereo recorder with a focus on hi-fi fidelity and versatility: quarter-track stereo allowed two stereo tracks (or four mono tracks by flipping), doubling capacity compared to half-track designs. Dual speeds provided flexibility—7½ ips for near-professional music fidelity (wide bandwidth, excellent transients), 3¾ ips for balanced domestic use. The three-head design enabled real-time off-tape monitoring during recording, a significant upgrade over 2-head models. The solid-state electronics delivered clean, dynamic stereo sound with superior clarity and imaging—modern vintage ratings place it around 7–8/10 for sound (one of the finest stereo Grundig recorders of the late 1960s) and 7–8/10 for build reliability/durability.

The drive mechanism was robust and precise, with additional features like automatic/manual/trick modes and vertical operation enhancing creative use. Common long-term service needs include:

• Cleaning heads, capstan, pinch roller, and tape path

• Replacing rubber drive belts/idlers (common failure point in 1960s/1970s solid-state models)

• Replacing electrolytic capacitors (leakage common after 50+ years)

• Lubricating mechanisms

• Checking transistor stages and power supply

Historical Context

The TK 244 was part of Grundig's extended 1960s TK series that transitioned toward solid-state hi-fi models with stereo capability. It followed earlier mono machines like the TK 40–47 and preceded later multi-speed/stereo machines (TK 14x, TK 24x, etc.). Surviving examples are highly sought-after by collectors today, often prized for their outstanding audio performance and condition due to robust construction, but most require basic restoration (especially rubber drive components and capacitors) for reliable operation. They represent a high point in vintage solid-state open-reel collecting, especially for those interested in late-1960s/early-1970s German audio engineering and DIN 45500-compliant quarter-track stereo designs with three-head monitoring.