Crown CX-824

The Crown CX-824 (also known as Crown Pro 800 Series CX-824) is a high-end, solid-state open-reel tape recorder from Crown International (Elkhart, Indiana, USA), produced from approximately 1968 to the mid-1970s (examples up to ~1977). It belongs to the flagship Pro 800 series (often nicknamed the "800 Series" or "Big Red Monster" for its robust build and occasional red accents), where "CX" signifies the deluxe electronics package—featuring plug-in modular circuit boards, front-panel bias/EQ adjustments per channel/speed, bass/treble controls, echo/sound-on-sound capability, and full three-speed equalization (vs. the simpler 2-speed SX variants).

The CX-824 was the ¼-track (four-track) stereo configuration of the 2-channel lineup (2-channel record/playback, but with four discrete tracks for bidirectional use, overdubbing, or reserve tracks). It shared the same professional Pro 800 transport as the half-track CX-822 (½-track stereo) and the larger 4-channel CX-844, emphasizing exceptional tape handling, reliability, and musicality for semi-pro studios, broadcast, mastering, or audiophile home use. Collectors often hail it as one of the finest American reel-to-reel decks, with a warm, dynamic "tape bloom" sound (slight high-end contour rather than dead-flat), high headroom, and rugged overbuilt construction.

Surviving units are rare collectibles, frequently restored (recaps, bearings, head relapping) and fetching $4,000–$8,000+ in good condition, often in custom walnut cabinets or rack setups.

Key Technical Specifications  

• Tape Speeds: 3.75 ips, 7.5 ips, and 15 ips (three fully equalized speeds with front-panel selection; NAB/CCIR switching available).

• Frequency Response (±2 dB typical): 30 Hz–25 kHz+ at 15 ips (record/play); 20 Hz–20/25 kHz at 7.5 ips; strong extension with characteristic slight high-end contour for warmth/bloom (real-world tests often exceed specs on premium tape like Scotch 207/406).

• Signal-to-Noise Ratio: 55–60 dB (overall/record-play; excellent for ¼-track due to low-noise design and quality components).

• Wow & Flutter (RMS wideband): ~0.05% at 15 ips; ~0.09% at 7.5 ips (top-tier from massive flywheel, hysteresis capstan, and neoprene belt).

• Track Configuration: ¼-track stereo (four-track; 2-channel record/playback—two tracks forward, two reverse—for extended sessions, overdubbing, or multi-pass use; bidirectional capability).

• Heads: 3-head design per channel (erase, record, playback); precision micro-gap permalloy heads with hyperbolic contour, shock-mounted/removable for alignment; off-tape monitoring while recording.

• Reel Sizes: Up to 10.5" NAB professional (HAP adapters standard; supports 2400'+ reels).

• Motors: 3-motor transport (hysteresis synchronous capstan with large flywheel/belt; separate plug-in torque-controlled reel motors—no tension arms; electromagnetic DC braking for smooth ~3-sec stops from full speed).

• Timing Accuracy / Speed Stability: ~99.8% (minimal drift; fast wind/rewind ~60 sec for 2400').

• Other Features:CX deluxe electronics: Plug-in modular PC cards (easy service/upgrades); front-panel bias/EQ per channel/speed; center-detent bass/treble controls; echo/sound-on-sound; mixing inputs (multiple mic/line per channel, unbalanced standard; balanced XLR via optional transformers); dual VU meters; headphone monitoring; source/tape switching; auto-stop; full logic pushbutton controls (feather-touch, buffered); remote record (no thumps); remote control optional.
  Inputs/Outputs: Mic/line (high impedance or optional balanced); line outputs up to 14V+ (600 ohm balanced/unbalanced).
  THD: <1% at 0 VU (1 kHz); high headroom/low distortion.
  Power: ~140–200W, 117 VAC 60 Hz (50 Hz available).
  

• Dimensions / Weight: ~19" W x 17–17.5" H x ~10" D (rack-mountable; detachable sections); ~52 lbs (heavier than SX due to deluxe CX boards and build).

• Original Price: ~$1,790–$2,000+ (premium pro positioning; comparable to high-end contemporaries like Ampex AG-440).

Design and Build Overview

The CX-824 used the advanced Pro 800 transport (logic-controlled pushbuttons, no tension arms—torque motor control for precise/pantograph-like tension, straight-line threading for editing). Electromagnetic braking provided gentle, consistent operation. CX electronics were Crown's premium solid-state offering: modular plug-in boards, front adjustments, echo, and 3-speed EQ (vs. SX's simpler 2-speed). It was monaural-constructed per channel (mirror-imaged) with shared power supply for reliability.

Built ruggedly for longevity (aluminum chassis, field-replaceable parts), it prioritized professional semi-pro use—broadcast/TV standard, audiophile mastering—with warm, blooming sound (dynamics/headroom from slight contouring). Compared to the CX-822 (half-track stereo sibling: same transport/electronics but wider tracks for better SNR/dynamics in 2-channel), the CX-824 traded some per-track quality for ¼-track versatility (overdubs, longer bidirectional play). It was below the 4-channel CX-844 in scale but top-tier for stereo/multi-pass.

Today, these are prized for restoration and their "Crown jewel" status. Common issues: electrolytic caps, bearings, relays, head wear (low-hour units exist). Manuals cover Pro 800 series (CX/SX).