Oberheim X-Series: OBX, OBXa, OB8, DMX, DSX PROMMER
OBERHEIM X Synthesizer Series
OB-X OB-Xa OB-8 DMX DSX PROMMER
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the Oberheim X System Line | |
OBX
difference Oberheim OB-X vs. OB-Xa OB-X = discrete analogue circuitry, possibly SSM? the ob-x has Crossmod which never came back on the later machines ob-x and ob-8 the xa added a split/double mode and was expandable from 4 to 8 voices with 2-voice cards.. and it also had 2 and 4pole filters, the obx had no 4pole mode.. find a nice pic/brochure and largest pic on the web of the OB-X here:: |
enlarge oberheim OBX? just click it! -all obx pics thanks to theo bloderer / bluesynths.com one voice can be controlled from the back.. click pic! |
Oberheim OB Xa.. the jump synth (uaa I hate to mark it like that).. better mention it was played by Depeche Mode…!!) Also there was an Expander „xpander“ version available .. don’t confuse those with THEEE Oberheim Xpander (see above) btw: thanks to axel fischer for help.. (the ob Xa was „in may way“ at his house)) this machine is part of the X-System the obx was it’s predecessor in 1979 and is the rarer one of both. – it is now famous for the „jump“ sound of van halen – but it is not just „jump“, some brasses and pads.. it’s like the oberheims are: fat and warm. very „broad and wide“ sound! thats they key .. and maybe explains the success in the 80ies! it’s still big in sound.. |
OBxa Problemzone: Nach Bestücken und Verlöten der Bauteile auf den Platinen wurden sie in ein chemisches Reiningungsbad gesteckt, gegen dreck. wirkung: nach einiger Zeit wurden Trimmpoti-Oberflächen angegriffen und die Widerstandswerte schwankten daher. ICs wurden per Sockelsteckverbindung befestigt, wg. besserer Servicefreundlichkeit. auch die Kontakte in den aufgelöteten Steckverbindungen bekamen Kontaktschwierigkeiten. was tun? Alle Trimmpotis und IC-Sockel raus, neue Potis und die ICs reinlöten. Informationen von Tom Oberheim / Marcus Ryle. click image to enlarge.. LPF 12dB/oct oder 24dB/oct. self reso. resolution 64steps = 6bit osc sync no xmod(ringmod or FM has chord memory, 32 RAM , up to 120 memories. LFO with s/h unison mode, split and double also. no midi, that was the new thing in the ob8 „obie eight“.. |
OB 8 quite close concept to ob x.. the classic oberheim see the midi ports? OB8 quite same features as OBXa.. but a bit more and midi.. structure: http://www.twicethemovie.com |
click image to enlarge.. click image to enlarge.. click image to enlarge.. want nice filter modulation by VCO? check j.haibles mod 2 VCOs and ARP’er and detunable voices (faaaat!) timeline 1974 – 1986: the OB-8 added some features on „page 2“ (double „click“ the chord memory button) like LFO key sync for phase control / retrigger modes, LFO quantize and more – the OB8 has at leasst 3 LFOs, 2 because you have 1 LFO per layer and another one „non programmable“ on the mod / wheel section (called lever @ oberheim). the ob8 is the most powerful one in the OB series (obx,oba,ob8) but also has not xmod like the obx. |
the sequencer DSX, another part of the oberheim Xa/DX series.. (drum machine dmx,the obx synth and ob-x/xpander – unfortunately there has been another xpander but they sold it as „ob Xpander“.. looks like THE xpander but with the knobs and tech. specs of the X of course..)the X System connectors are a 2 „Blocks“ of Connectors (2 white very unusual sockets with lots of pins, one for trigger one for CV) | |
the early digital Sequencer on the left: the analog step sequencer that came with some of the X-Voice models, below: filtermodule (external) see more on this design in the SEM section.. click to enlarge –> |
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the DMX belongs to oberheims „x-system“. one of those 12bit drummachines. the category is same as linn drum, drumtracks, drumulator etc..there were 2 versions, the „stretch DX“ (mid / above) and the (right / below) DMX click to enlarge –> triggering DMX: most oberheim drummachines do not have midi since they had their DX system (or DMX system..) |
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Oberheim OB Prommer
basically some sort of self burning sampler for these drum machine models: burning your 8bit samples to an EPROM (electrical programmable read only memory) – typical mid 80ies style.. |
click Prommer image to enlarge.. thx viewermail studio for pic! fill other machines with your samples.. |
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