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Studer A67 need help !

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analog-sound:
Hello, I need help to repair one Studer A67. At play mode the take up motor it vibrates and is noisy. I have the service manual, and there is one bullettin service which shows what the waveform that drives the power transistor should look like,but without mentioning the cause or remedy.
The sheet illustrates the wave form which should be a non-jagged sinusoid, but mine is jagged.
The bulletin service should be 10 pages, but the copy I have reaches 9/10. Maybe I miss a page?I tried to change the capacitors without result. Has anyone already received it or has solved the problem ?
Thanks
Paolo

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