Search found 13 matches

by davebr
Fri Feb 09, 2018 5:44 pm
Forum: Moog Music General Topics Forum
Topic: Micromoog switch replacement
Replies: 0
Views: 833

Micromoog switch replacement

I just repaired a Micromoog. The pitch was unstable and there were two issues. The first was the tin-on-tin connectors just didn't have good contact resistance even after cleaning. I pulled all the headers and replaced them with gold. You have to use the same style header as you have to solder both ...
by davebr
Fri Apr 21, 2017 3:46 pm
Forum: Moog Music General Topics Forum
Topic: Micromoog repair help
Replies: 2
Views: 813

Re: Micromoog repair help

I dont want to just replace every component in the VCO. Is there any component I should be looking at directly? Any help or direction would be sooo much help. Thanks!! I can walk you through some tests. I have the recent posting on the Micromoog photos. From the link there you can get to my home pa...
by davebr
Wed Apr 19, 2017 8:08 pm
Forum: Moog Music General Topics Forum
Topic: Micromoog photos
Replies: 0
Views: 695

Micromoog photos

I recently had a Micromoog come into the shop so took an opportunity to take some photos and combine the schematics into a single sheet. Details are on my Micromoog page at http://modularsynthesis.com/moog/micromoog/micromoog.htm . I had quite a bit of trouble with the trigger generator. It kept see...
by davebr
Thu Sep 08, 2016 1:34 am
Forum: Moog Music General Topics Forum
Topic: Help! The Source is killing me!!!
Replies: 21
Views: 4503

Re: Help! The Source is killing me!!!

I just finished repairing a Moog Source although the membrane was in good condition. That synth is full of sockets and connectors, all tin. Tin corrodes and it's been nearly 40 years since it was manufactured. The first thing I would do is re-seat every connector and every IC. Some of the connectors...
by davebr
Mon Aug 29, 2016 11:19 am
Forum: Moog Music General Topics Forum
Topic: Moog Source
Replies: 4
Views: 1609

Re: Moog Source

I just saw this today but yesterday posted my repair of a Source Incremental Controller http://forum.moogmusic.com/viewtopic.php?f=1&t=26034 . I had to make three modifications to use different sensors. The standard LED current is way too high, the pinout was different, and I had to adjust the p...
by davebr
Sun Aug 28, 2016 1:53 pm
Forum: Moog Music General Topics Forum
Topic: Moog Source Incremental Controller
Replies: 4
Views: 1365

Moog Source Incremental Controller

I got a Moog Source in for repair and had to rebuild the Incremental Controller. I could find a few hints on the web but none that were successful. I replaced both sensors and made necessary modifications to get a very nice gray code output and the Incremental Controller works very well. Details of ...
by davebr
Tue Jun 14, 2016 2:44 am
Forum: Modular Forum
Topic: 921 clamping point?
Replies: 14
Views: 3236

Re: 921 clamping point?

The 921 clamping level is the level to which the oscillators will be clamped on a hard sync via the Clamp Trig input. It is edge triggered with about a 1 mS delay and then the waveform starts from this level. Note all oscillators do not clamp to the same level. I have two scope pictures on my 921 pa...
by davebr
Sat Apr 09, 2016 12:04 am
Forum: Modular Forum
Topic: System 55 Restoration
Replies: 7
Views: 1500

Re: System 55 Restoration

Dave, Excellent and interesting as always. One question, did you notice if the inductors in the 914 are toroids or spool type? David I didn't look at them that closely. This is the best image I have of the 914 and it is hard to tell but it looks like a toroid to me. http://modularsynthesis.com/imag...
by davebr
Fri Apr 08, 2016 11:45 pm
Forum: Modular Forum
Topic: System 55 Restoration
Replies: 7
Views: 1500

Re: System 55 Restoration

I have just a question for you, if I may. I noticed that the page on the 921B shows a picture of the component side of the 921A where one would expect the component side of the 921B. In the last few months I have managed to reverse engineering the pcb layout of the 921B, using some photos I collect...
by davebr
Tue Apr 05, 2016 2:25 pm
Forum: Modular Forum
Topic: Troubleshooting Old 905 Reverb Unit
Replies: 22
Views: 12376

Re: Troubleshooting Old 905 Reverb Unit

I have some photos and a corrected schematic on the 905 I restored. You can email me if you want higher resolution photos. Email is on the home page.
http://modularsynthesis.com/moog/905/905.htm

Dave
by davebr
Sat Apr 02, 2016 7:41 pm
Forum: Modular Forum
Topic: System 55 Restoration
Replies: 7
Views: 1500

System 55 Restoration

I just finished restoring a near-original Moog System 55 for a client and took the opportunity to photo document the system. It is on my Moog System 55 Restoration page http://modularsynthesis.com/moog/system55/moog_system55.htm . I didn't duplicate pages for three of the modules that were the same ...
by davebr
Mon Apr 07, 2014 2:58 pm
Forum: Moog Music General Topics Forum
Topic: Large modular restoration with great pictures
Replies: 21
Views: 10244

Re: Large modular restoration with great pictures

I also took photos of a Sonic Six that I restored. I posted it somewhere in the forum but darned if I can find it now. That page is at http://modularsynthesis.com/moog/sonic_six/sonic_six.htm

Dave
http://modularsynthesis.com
by davebr
Sat Apr 05, 2014 12:55 pm
Forum: Moog Music General Topics Forum
Topic: Large modular restoration with great pictures
Replies: 21
Views: 10244

Re: Large modular restoration with great pictures

When I started on this Moog I needed to figure out which mods were user installed and which were factory installed. I started looking for some photos and found there were really none of the modules themselves and few of the rear of the cabinet. I decided to take this opportunity to take and post pho...