The Akai GX-635D (late 1970s) is a 7" reel-to-reel quarter-track deck with Akai's GX glass-and-X'tal ferrite heads, which dramatically reduced head wear versus competing decks. Capable at 7.5 and 15 IPS. Auto reverse via head rotation.
Pricing in 2026 for a serviced 635D: EUR 600-1100. Unserviced units trade significantly lower but virtually all need belt and pinch-roller replacement.
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Rubber parts (pinch roller, brakes, belts) decay; replacements cost EUR 100-250 depending on what is needed. The GX heads are exceptionally durable - look at head photos for asymmetric wear or pitting; that is usually fatal.
Verify auto-reverse engages in both directions and that record and playback EQ switches function on both speeds.