Oberheim OB-Xa

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Oberheim OB-XaThe Oberheim OB-Xa was Oberheim's overhaul of their first compact synthesizer, the OB-X. The OB-Xa was released in 1980, a year after the OB-X was released. Instead of discrete circuits for oscillators and filters, the OB-Xa (and the Oberheim synths to follow) switched to Curtis integrated circuits. This made the inside of the synth less cluttered, reducing the labor required to replace bad parts; and reduced the cost of manufacture. However, today it's much easier to fix an OB-X than OB-Xa, as Curtis parts are getting scarcer, whereas discrete parts used in OB-X are almost always readily available.

Aside from hardware changes, the OB-Xa had better interface features compared to OB-X. These included being able to split the keyboard into two halves with different voices; the ability to layer voices to create thicker sound (essentially making two notes sound for every key pressed). polyphony stayed the same - again 4,6 and 8-voice models were offered.

One function that did disappear from OB-X voice architecture, was cross modulation, or frequency modulation of vco with the second vco. When done with analogue circuits, it's a unique sound made famous by Prophet 5 and its poly-mod section. Lack of this somewhat reduced the range of sounds possible on OB-Xa.

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OBERHEIM OB Xa SYNTHESIZER 8 VOICE 120 PROGRAMS
OBERHEIM OB Xa SYNTHESIZER 8 VOICE 120 PROGRAMS
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Oberheim Service  Operator Manuals LOT
Oberheim Service Operator Manuals LOT
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Oberheim OB Xa Voice Card Ultimate Service Kit Watch Video
Oberheim OB Xa Voice Card Ultimate Service Kit Watch Video
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Oberheim OB Xa Synthchaser Upgraded Cable Wire Harness Replacement Set
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Oberheim OB Xa Voice Card Full Trimmer Kit  120 pieces
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Oberheim OB Xa Power Supply Capacitor Rebuild Kit Watch Video
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Oberheim OB Xa Voice Card Rebuild Kit Watch Video
Oberheim OB Xa Voice Card Rebuild Kit Watch Video
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Pratt Reed Bushings SET Prophet 5 10 OBERHEIM OB X OB Xa ARP 2500 PPG
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1981 Contemporary Keyboard Magazine George Shearing YES Downes Oberheim OB Xa
1981 Contemporary Keyboard Magazine George Shearing YES Downes Oberheim OB Xa
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Oberheim OB Xa T Shirt 100 Cotton Retro Analog Synthesizer Sem Ob 1 Ob 8
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VIRTUAL Oberheim OB Xa OBXa editor programmer Encore 12 LOGIC v4 X
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Internal Battery for Oberheim DX OB 1 OB SX OB X OB Xa OB 8 Matrix 12 Xpander
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Oberheim DX  OB 1  OB SX  OB X  OB Xa  OB 8  Matrix 12 Xpander Battery
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Panasonic Internal Battery Oberheim OB 8 Matrix 12 Xpander OB SX OB X OB Xa
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OBERHEIM OB XA SERVICE MANUAL
OBERHEIM OB XA SERVICE MANUAL
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Oberheim OB SX  OB XA 1 4 inch mono plug with washer
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OBERHEIM Matrix 12 6 Xpander MC 3000 OB x 6 8 12 SYNTHESIZER rerigerator magnet
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Oberheim OB 1 OB SX OB X  OB XA New AC power socket
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Oberheim OB 1 OB SX OB X  OB XA Replacement Power Inlet Jack
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