MTX Thunder X500D

Dr Zeus · 23rd December 2011, 01:03 AM

This amp had a blown powersupply, but also two 35v 100uF caps at C98 and C99. I repaired the power supply so now the amp powers and plays, but the rail voltage is very low; +-9vDC. The waveform coming off the transformer is +-10v clean square wave. Regulated voltage looks alright at +-13.5vDC referencing amp general ground.

What could be causing low rail voltage?

Dr Zeus · 23rd December 2011, 02:51 AM

I figured it out. The coil connected between the outputs had shorted windings. I was able to unwrap and insulate the short. Also note while shorted occasionally the amp would draw excessive current.

23rd December 2011, 01:03 AM	#1
Dr Zeus diyAudio Member Join Date: Oct 2010	MTX Thunder X500D This amp had a blown powersupply, but also two 35v 100uF caps at C98 and C99. I repaired the power supply so now the amp powers and plays, but the rail voltage is very low; +-9vDC. The waveform coming off the transformer is +-10v clean square wave. Regulated voltage looks alright at +-13.5vDC referencing amp general ground. What could be causing low rail voltage?

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23rd December 2011, 02:51 AM	#2
Dr Zeus diyAudio Member Join Date: Oct 2010	I figured it out. The coil connected between the outputs had shorted windings. I was able to unwrap and insulate the short. Also note while shorted occasionally the amp would draw excessive current.

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