Search found 72 matches

by Jacob Hunt
Tue Feb 11, 2020 2:08 am
Forum: General Synthesizers
Topic: Digital Synth Circuits
Replies: 2
Views: 1080

Re: Digital Synth Circuits

Thanks, I’ve been absorbed in this for hours now! Looks like exactly what I needed.
by Jacob Hunt
Wed Feb 05, 2020 2:57 am
Forum: General Synthesizers
Topic: Digital Synth Circuits
Replies: 2
Views: 1080

Digital Synth Circuits

Hey all, I was wondering if anybody might have any recommendations or pointers towards a way to gain a little more familiarity with the type of digital systems typically found in the vintage analog polysynths like the OB-Xa. I don’t usually have much issue troubleshooting the analog sections, but I ...
by Jacob Hunt
Fri Oct 06, 2017 5:38 pm
Forum: HELP!
Topic: Polymoog Keyboard Modulation
Replies: 4
Views: 1115

Re: Polymoog Keyboard Modulation

Thanks! The actual original problem ended up being on an op-amp socket I had soldered in- seems the input and output of the amp had bridged together with solder from my sloppy work.. So a good reminder to myself and anybody reading to always check the simple things as well, and well, be less sloppy ...
by Jacob Hunt
Tue Sep 19, 2017 1:33 am
Forum: HELP!
Topic: Polymoog Keyboard Modulation
Replies: 4
Views: 1115

Re: Polymoog Keyboard Modulation

Turns out not long after replacing q6, a12 which I had already tried swapping started to smoke! Replaced it and now it's good! Just a few more little problems here and there..
by Jacob Hunt
Sun Sep 17, 2017 2:28 am
Forum: HELP!
Topic: Polymoog Keyboard Modulation
Replies: 4
Views: 1115

Re: Polymoog Keyboard Modulation

Here is the related schematic- A14 is the amp I referred to

Image
by Jacob Hunt
Sun Sep 17, 2017 2:20 am
Forum: HELP!
Topic: Polymoog Keyboard Modulation
Replies: 4
Views: 1115

Polymoog Keyboard Modulation

Ok, so over the past few weeks I've been wrapping my head around this broke down Polymoog keyboard of mine best I can. Just trying to understand the signal flow and getting a general idea of what's happening has been a chore all on it's own given the complexity it is famous for. Anyway, now I've got...
by Jacob Hunt
Tue Sep 27, 2016 1:23 am
Forum: Gear Services & Other Goods
Topic: Wanted: Minimoog Parts
Replies: 1
Views: 1458

Wanted: Minimoog Parts

I've got this Model D which is missing several components, and I've not been able to find some of them at all. I breathed a sigh of relief when Moog announced the new Model D, but alas, they won't deal with me at all. Anyway, I'm looking for: -the prop in the rear that holds up the panel. Would real...
by Jacob Hunt
Tue Sep 06, 2016 12:58 am
Forum: Gear Services & Other Goods
Topic: Moog MG-1 Pitch Mod
Replies: 1
Views: 1910

Re: Moog MG-1 Pitch Mod

I remember a far simpler mod working on the Moog Prodigy, not sure if it's the same. Anyway, there was a pin in the pitch wheel that kept the wheel from spinning too far that can be removed. This allowed it be be tuned a full octave lower, probably could have worked for higher too, I forgot by now. ...
by Jacob Hunt
Sat Aug 27, 2016 1:54 am
Forum: General Synthesizers
Topic: Most notable/obvious use of a specific synth
Replies: 39
Views: 8882

Re: Most notable/obvious use of a specific synth

Davolisint on Caravan's "The Dog, The Dog, He's at it again"
Roland System 100 all over the first two Human League albums
OB-X from Rush's "Subdivisions"
by Jacob Hunt
Sat Aug 27, 2016 1:42 am
Forum: HELP!
Topic: OB-Xa Voice Card Problem
Replies: 3
Views: 891

Re: OB-Xa Voice Card Problem

Good call on R12! I pulled it, and measured it, and it was conducting nothing whatsoever. Replaced it, and back to new :D

My OB-Xa and I thank you very much Broadwave!!
by Jacob Hunt
Wed Aug 24, 2016 2:21 am
Forum: HELP!
Topic: OB-Xa Voice Card Problem
Replies: 3
Views: 891

OB-Xa Voice Card Problem

Hey all, I'm experiencing a small, (usually tougher to figure aren't they?) but annoying problem with my OB-Xa. One voice card has a problem with VCO 1. I have moved the card around, it is certainly only on one board, one VCO, problem follows the card. Anyway, the problem is an unsteady, and too low...
by Jacob Hunt
Sat Apr 02, 2016 2:17 am
Forum: General Synthesizers
Topic: How many of you have organs in your set-up?
Replies: 23
Views: 6381

Re: How many of you have organs in your set-up?

Vox Continental and Hammond L-100, couldn't do without them!
by Jacob Hunt
Mon Feb 15, 2016 3:09 am
Forum: HELP!
Topic: Micro Moog problem
Replies: 1
Views: 507

Re: Micro Moog problem

Ic202 in the keyboard circuit looks like a good potential starting point
by Jacob Hunt
Sat Feb 13, 2016 5:27 am
Forum: HELP!
Topic: Early OB-Xa Portamento adjustment
Replies: 1
Views: 605

Re: Early OB-Xa Portamento adjustment

Got it! Found a first edition manual pdf that had a procedure for matching the upper and lower voices portamento time with some trimmers :D
by Jacob Hunt
Wed Feb 10, 2016 2:02 am
Forum: HELP!
Topic: Early OB-Xa Portamento adjustment
Replies: 1
Views: 605

Early OB-Xa Portamento adjustment

Hey everybody! I recently refurbished my OB-Xa (bushings, caps, etc.) and just completed calibration. Only problem is my Obie is a very early model with the analog portamento, and well, the portamento is severely out of spec. Some voices are a good bit slower than others on max portamento, probably ...