MTX thunder801d

fragmental · 16th March 2011, 04:34 PM

Just wondering if anyone had an idea why the the dc input filter caps would go on a MTX thunder801d amp, 2200uf@50V. There are 2 of these and I replaced one a few months back with a generic cap. The new cap is swollen and bad again and the one i left in is bad as well..

Could this amp survive reverse polarity and only take out theses caps or is this a heat issue?

Perry Babin · 16th March 2011, 04:52 PM

The 801 has 80v caps.

fragmental · 16th March 2011, 04:58 PM

The 2200@50v looked original but it may have been replaced before. Why 80V caps on a 12v system? Back emf out of the transformer or something?

Perry Babin · 16th March 2011, 05:02 PM

I thought you were referring to the rail caps (which are actually 4700uf).

Many times, the primary filter caps have a significantly higher voltage than the B+ voltage. Caps with higher voltage ratings typically have lower ESR which means that they'll run cooler and will be more reliable.

If you're replacing the primary filter capacitors, you need to use 105C, low impedance capacitors.

16th March 2011, 04:34 PM	#1
fragmental diyAudio Member Join Date: Sep 2010	MTX thunder801d Just wondering if anyone had an idea why the the dc input filter caps would go on a MTX thunder801d amp, 2200uf@50V. There are 2 of these and I replaced one a few months back with a generic cap. The new cap is swollen and bad again and the one i left in is bad as well.. Could this amp survive reverse polarity and only take out theses caps or is this a heat issue?

16th March 2011, 04:52 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The 801 has 80v caps. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

16th March 2011, 05:02 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I thought you were referring to the rail caps (which are actually 4700uf). Many times, the primary filter caps have a significantly higher voltage than the B+ voltage. Caps with higher voltage ratings typically have lower ESR which means that they'll run cooler and will be more reliable. If you're replacing the primary filter capacitors, you need to use 105C, low impedance capacitors. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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16th March 2011, 04:58 PM	#3
fragmental diyAudio Member Join Date: Sep 2010	The 2200@50v looked original but it may have been replaced before. Why 80V caps on a 12v system? Back emf out of the transformer or something?

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