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Old 29th August 2013, 08:28 PM   #11
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Location: Louisiana
I wouldn't replace the TL072 without a reason.

The failure of the voltage regulators can cause extensive damage. There is likely damage on the preamp board as well.

When you power it up, make sure all components are clamped. Do not connect the preamp board until you know that the regulators are OK.

With the scope set to 5v/div, place your scope probe on the regulator output leg and power the amp up. If the voltage viewed on the scope goes off of the display, immediately shut down the amp to prevent further damage. Do for both the positive and negative regulators.
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Old 30th August 2013, 04:02 AM   #12
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Well Replaced R143, R406,

Im guessing the rail caps are defective also I removed them from the board and can hear the inners rattling around in the cap
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Old 30th August 2013, 05:17 AM   #13
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Set scope to 5v div..

And 5us or 5ms ?


Also your talking about the Mur1620ctr and the byw51 ?
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Old 30th August 2013, 06:14 AM   #14
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The two IRF540s near the rectifiers are the regulators. You can check on the ends of R318 and R319 farthest from the IC.
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Old 30th August 2013, 07:06 AM   #15
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The trace on the scope stays centerd

Set the scope to 5v div and 5 ms tryed a couple different posistions and it stayed centerd
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Old 30th August 2013, 09:51 AM   #16
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Did you confirm that the power supply was operating?
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Old 30th August 2013, 02:28 PM   #17
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I have a nice square wave on the power supply fets (gate leg)

Im getting + - 15 volts of regulated voltage

Im getting -63 and + 56 volts of rail..


But im getting 56.2 volts measured directly across the outputs..

Any idea what might cause this?
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Old 30th August 2013, 04:20 PM   #18
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Post the DC voltage on all pins of the op-amp between R405 and R407.
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Old 30th August 2013, 06:59 PM   #19
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NE5532

Pin 1:12.59
Pin 2:13.60
Pin 3:13.81
Pin 4:-15.34
Pin 5:13.72
Pin 6:13.99
Pin 7:14.59
Pin 8:15.46
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Old 30th August 2013, 07:38 PM   #20
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It appears to be defective but since the input voltages are so near the supply voltage, it's not possible to tell definitively.
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