Moog Music Forum

Oh, something else: The wood on the Opus was actually maple. I wasn't a huge fan of the super-dark, sort of mud-like stain that was on the chassis when I got mine...and it was in really rough shape anyway, so I figured I'd just make it a color I liked. Tried a natural stain. Tried a walnut. Tried wh...

I had good-ish luck with the Technology Translpant slider set for the Opus. Communication was pretty much non-existent, granted, and English was strained. But everything arrived around 3.5 weeks after my order was made. When one package of three sliders was missing from the set, I received them prom...

I've polished keys with toothpaste, to decent results. They smell minty fresh, too!

My slider set from Technology Transplant took 3 weeks, if I recall correctly. It was worth it. My old sliders were horribly gunked-up and, while they could be disassembled and cleaned, it is MUCH easier to just de-solder and replace.

Sounds like you need to start replacing IC's on your control board. Truthfully, they have a limited lifespan anyway, and should probably just all be replaced. The 4000 series logic IC's are known for failing, though when I had a similar issue with the VCF, the culprit turned out to be one of the op-...

Broadcast made liberal use of vintage synths, though I don't think I have ever seen any video of them with specifically Moog gear. They have, however, been filmed with a Korg Delta, Korg MS-20, and Sequential Circuits Pro-One. Stereolab was, of course, one of the earlier contemporary bands to champ...

that Opus is absolutely beautiful. Looks like you took Novus to the keys also (?). Thanks! Actually, I used toothpaste and a soft cloth. It took out most of the smaller scratches, and left the keys smelling minty fresh! There are still a few scratches left, though...so I may look into giving that N...

Finally figured out the last of the issues last night! As of last night, I had still been experiencing a nonfunctional VCF envelope, nonfunctional articulator mode switch and attack fader, and nonfunctional modulation delay. I practically rebuilt the entire VCF section...new IC's new capacitors, new...

Well, I replaced the 4007, 4001, and two 4053 IC's on the VCF....and the 4007 on the articulator attack...and....nothing. Well, mostly nothing. Here's what it's doing: VCF emphasis and cutoff work perfectly. But then, they always did. Contour amount now appears to work properly, instead of simply af...

The DeOxit is really just for cleaning the contacts -- your contacts with sparkle and shine, but it will absolutely remove any old lubricant on there. Thus the Luberex afterward. It's a white dielectric grease that you can lube your sliders up with before reassembling. It works really well, and make...

For the sliders, I got the kit from Technology Transplant. The quality of the parts seems fine. They are all clean, they all work well, and they are bagged and labeled according to the parts list in the service manual, which is rather handy. The downside was in dealing with the seller...maybe. I'm h...

Speaking of those transistors...

Q4 and Q5 on the board are NPN Darlington D16P1 Transistors, which appear to have been discontinued.

Anybody know of a suitable replacement?

Replaced the TDA1008 IC that routed the D#'s, and that fixed the keyboard issue. Very thankful that it wasn't the MO83! Next thing that I think I will tackle is the filter. So here's what's up: Attack and Decay don't really seem to do much of anything at all. Sustain...kinda sorta does something. It...

I would give retr0bright a try. Removes discoloration in ABS plastic very well. Mix a tiny bit of Oxy-clean detergent into a much larger amount of hydrogen peroxide. Soak in the sun for 4-6 hours.

Thanks for the reply! I sourced a couple of TDA1008 divider IC's from ebay. Went ahead and picked up a few of them, just in case...though I'm a bit worried (since the fault seems to be originating in the top octave) that it's the MO83 TOS chip. Fingers crossed! Thanks for the tip on the 4007s, too! ...