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Vintage Synth Repair

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ARP 2600 VCO repair

2010-12-03 by James

Hello all... does anyone have any experience of opening & repairing a 4027-1 oscillator? The pulse wave on VCO1 in my 2600 disappeared and upon testing I found that the sawtooth output from the 4027-1 core was fluctuating around 1.5 to 2v instead of the expected 10v... any advice or suggestions on opening & trouble-shooting the submodule would be appreciated.

Cheers,
J.

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