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PeteMOBie · 9th June 2009

Hi ClusterChord
Thanks for the advice on capacitors and trimmers.

My ESQ-1 has gone wierd all of a sudden, and apparently the main cause is capacitors going on the power supply board. So that's another job for me. Sorry to say I couldn' afford the Matrix 6 at the time, so went with the Ensoniq.

I've compared your OBXa voice board against the OB-SX from your pics, and note that the OB-Xa has better quality Osc Frequency trimmer pots. My service guy has replaced a few components and sorted a few dry solder joints, so it is better now. I have to remind myself that my model is over 27 years old, so am impressed that it has lasted this long.

Hi Lawrence
Thanks for your Service Manual update. I wasn't aware there were other manuals out after 1980. It makes sense that there will be some changes as on my Feb 1982 OB-SX 56 Preset model, the groups are selected by multiple combinations of the A, B, C Group buttons in the same manner as the OB-Xa, so I guess there will be some differences in the circuitry to reflect this change. I also have to remind myself that the OB-SX ran in parallel with the OB-X and OB-Xa.

Does anyone have a later edition User Manual? I'd be curious to know if it lists all 56 sounds, as the 1980 edition I have only lists the first 24 presets.

I was actually planning on selling my OB-SX, but I'm not so sure now, having got it back from being repaired/serviced, and reading all the encouraging entries and keen interest in them on this forum.

To make matters worse I've seen the Tom Obeheim New SEM pages on the web and want one more than a Moog Little Fatty.

9th June 2009	#30
PeteMOBie Gear interested Joined: Jun 2009 Location: Tasmania Posts: 23	Hi ClusterChord Thanks for the advice on capacitors and trimmers. My ESQ-1 has gone wierd all of a sudden, and apparently the main cause is capacitors going on the power supply board. So that's another job for me. Sorry to say I couldn' afford the Matrix 6 at the time, so went with the Ensoniq. I've compared your OBXa voice board against the OB-SX from your pics, and note that the OB-Xa has better quality Osc Frequency trimmer pots. My service guy has replaced a few components and sorted a few dry solder joints, so it is better now. I have to remind myself that my model is over 27 years old, so am impressed that it has lasted this long. Hi Lawrence Thanks for your Service Manual update. I wasn't aware there were other manuals out after 1980. It makes sense that there will be some changes as on my Feb 1982 OB-SX 56 Preset model, the groups are selected by multiple combinations of the A, B, C Group buttons in the same manner as the OB-Xa, so I guess there will be some differences in the circuitry to reflect this change. I also have to remind myself that the OB-SX ran in parallel with the OB-X and OB-Xa. Does anyone have a later edition User Manual? I'd be curious to know if it lists all 56 sounds, as the 1980 edition I have only lists the first 24 presets. I was actually planning on selling my OB-SX, but I'm not so sure now, having got it back from being repaired/serviced, and reading all the encouraging entries and keen interest in them on this forum. To make matters worse I've seen the Tom Obeheim New SEM pages on the web and want one more than a Moog Little Fatty.