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LWG · 8th June 2009

Hello,

The earlier gray and black versions of the OB-SX and the later black with blue stripes are not identical.
The gray SX has a CEM osc, filter, & egs, but the vca is not, as its a CA3080 with op amp buffering (tl0-81).
You can verify this in the first edition sevice manual (November 1980).
Older units such as these are a sort of transition between the older Oberheim deisigns and the fully CEM-based ones.
The later editions with blue pinstriping have a CEM3060 vca, i.e, a full
CEM chip set. They are actually closest to the OB-Xa.
In order to fully service the later models, you'll need a second edition service manual.

Regards,

Lawrence

8th June 2009	#29
LWG Gear Head Joined: Jun 2009 Posts: 69	Re: Thread Topic Hello, The earlier gray and black versions of the OB-SX and the later black with blue stripes are not identical. The gray SX has a CEM osc, filter, & egs, but the vca is not, as its a CA3080 with op amp buffering (tl0-81). You can verify this in the first edition sevice manual (November 1980). Older units such as these are a sort of transition between the older Oberheim deisigns and the fully CEM-based ones. The later editions with blue pinstriping have a CEM3060 vca, i.e, a full CEM chip set. They are actually closest to the OB-Xa. In order to fully service the later models, you'll need a second edition service manual. Regards, Lawrence