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Topics - analog-sound

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Reel to Reel Tape Machines / Studer A67 need help !
« on: October 23, 2019, 04:14:38 AM »
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 ?

Reel to Reel Tape Machines / Telefunken m15
« on: October 30, 2014, 03:27:27 AM »
Hello everyone, my name is Paul and I live in Rome.
I just joined the forum to share this passion with you.
I recently I bought a Telefunken m15 (not A) but I can not find the service manual, can anyone help me?
I have not turned on because I'm not sure how sound cards are inserted in the frame, if there is any owner of this machine that can help me, would be a big favor to me.

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