Nov
8
Written by:
Niklas Eriksson
11/8/2008 1:51 PM
The Moog Micromoog is probably one of the most frequently visiting types of synthesizers in my workshop. During the last two months I have had four Micromoog's on visit, all with different problems. Last week I finished the work of repairing yet another Micromoog with a bad power supply, a silent oscillator, a non-working ribbon controller and a silent LFO. It took some time to figure out all the problems but as usual when it comes down to Micromoog's there wasn't any major issues it. A couple of new opamps and some replaced parts in the ribbon controller was all it took to bring it back to life!
Despite only having one oscillator and crippled envelope generators (only attack / decay) the Micromoog is really an amazing little synthesizer. Equipped with a sub-oscillator, a variable wave-shaper and a 24dB per octave low-pass filter it sounds great! If the great sound isn't enough the instrument also have a fairly open architecture making it highly suitable for processing external audio or controlling other CV-devices.
Copyright ©2010 Niklas Eriksson
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3 comment(s) so far...
Re: Yet another Micromoog brought back to life ...
Hi Niklas,
Great website. It is nice to see such vintage moogs. I have a minimoog and a micromoog that I've had since the late 70's/early 80s. They both have been in storage for a while and I'm trying to bring them back to life. The minimoog seems to be fine after cleaning it up however the micromoog has seen quite a bit more road knock. I have a problem with tuning on the micromoog that I would like to get your input.
I have a micromoog whose middled register will not scale properly. I've followed the tuning precedure in the technical service manual and successfullly tuned the ocsillator range and scale (low F and high F tune perfectly). However the middle register is off by a half tone or more. The trouble shooting guide for oscillator scale suggest Falulty IC304 or IC303, Leaky Q307 or Q308, -15V power supply drift. Faulty R359 TEMP or R331 OSC SCALE trimpots.
Any suggestions on how to narrow down why the middle register does not scale properly? I plan to take a look at the schematics this weekend and do some measurements on the power supply and other check points.
Thanks
James
By James on
9/21/2009 4:53 PM
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Re: Yet another Micromoog brought back to life ...
Hi Niklas, great site!.. COuld you give some advice on bringing to life a micromoog that seems to have a faulty oscillator ( i hear a noise underneath it all.) I appreciate any help.
Saludos!
By Luis Vargas on
2/12/2010 10:26 PM
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Re: Yet another Micromoog brought back to life ...
Very positive blog! I'm really impressed )
www.rapidsharemix.com/trends/dk/07-04-2010.html
By Yannis on
4/8/2010 12:58 PM
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