Minimoog osc help

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StudioSQ

Well-known member
Joined
Jun 22, 2009
Messages
60
I have a minimoog with an old osc board. the number one osc suddenly stopped responding to the keyboard and range controls and is stuck in a very high tone. Everything else still works on osc 1 including the waveshape and the modulation and bend controls the trimpots in this section are replaced and have worked for some time, all other functions on the osc card work. Any ideas?
 
http://www.fantasyjackpalance.com/fjp/sound/synth/synthdata/16-minimoog/002/903-osc-print-schem-below.gif

i forgot the schematic
 
well that was totally it, thanks. Any idea why the 741 op amp works in this circuit and a tl071 or opa134 dosent?
 

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