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VOX ac30 AND MAGAIR 3000,hi just looking for some circuit diagrams or technician manuals for these

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There are many versions of the AC30.... here is one of them Good luck

Posted on Jan 12, 2008


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Hello fixya. So I have placed new pots on a Vox VT30. Tested it and it worked fine. My son was playing while I replaced the back panel. A screw was too long and touched one of the pots. It shorted out...

This might be the schematic for your unit:

Scroll down to the link "Get Manual" to download the PDF file.

I don't see any connection on a pot that could be touched to cause the problem. OFTEN when screws are too long and they touch a board they can crack the circuit traces or PUSH etch to cause a short.

Use a BRIGHT LED flashlight to "candle" the board for cracks or scrapes. The voltage regulators are current limited and self protecting. The first thing is to determine what the screw touched and look for damage in that area.

I hope you replaced the pots with the CORRECT TAPER as well as resistance value. Whille incorrect taper would not inhibit operation, it would make adjusting the pots in use somewhat difficult.

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Here is a link to Vox: Start by checking the wiring to the speakers and the speakers themselves.

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Hello, ive got a 1970's vox ac30 solid state amp and its sounds great except the vibtrem does not work, any ideas to fix it, thanks ade


You can get a circuit for your amp from here.

Not sure what you electronics ability is, but if I were repairing the amp, I would look to check that there is audio getting through the opamp stage 1C, then the function of the FET 2N3819 to provide the vibrato effect. It has an oscillator driving its gate, that too should be checked for operation. I know it is not a "do this to fix it" repair, but without being able to do these checks with an oscilloscope on the amp, nobody can say for sure what the problem is. If you have any questions, I am happy to talk to you about the amp. Good Luck with the repairs.


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