MTX JH600 w/burnt gate resistors

Ronode · 1st August 2011, 09:11 PM

Have an MTX600 amp with 4 bad power supply mosfets. (HUF75339P)
The gate resistors , R114/R115 are burnt.
Anyone know what value they were?

Thanks

Perry Babin · 2nd August 2011, 09:27 AM

If no one can answer your question, email MTX for the value. If they won't help, anything between 22 and 47 should work.

Ronode · 2nd August 2011, 06:38 PM

E-mail reply from MTX: "We do not have location properties available for amps that we still do repairs on."

Given MTX policy of no tech. help on current product I took a closer look at these 2 resistors.

Cleaned up the resistor with the least signs of overheating and now I can just make out the markings.
Pretty sure it's marked 1820 , which would be 182 ohms.
Had 2 other pair of eyes look at it without telling them what I saw and both agreed.
It measures 183 ohms while the really burnt one reads 254.

Hope this helps the next guy that has to fix a JH600.

1st August 2011, 09:11 PM	#1
Ronode diyAudio Member Join Date: Jul 2005 Location: Racine WI	MTX JH600 w/burnt gate resistors Have an MTX600 amp with 4 bad power supply mosfets. (HUF75339P) The gate resistors , R114/R115 are burnt. Anyone know what value they were? Thanks

2nd August 2011, 09:27 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If no one can answer your question, email MTX for the value. If they won't help, anything between 22 and 47 should work. __________________ 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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2nd August 2011, 06:38 PM	#3
Ronode diyAudio Member Join Date: Jul 2005 Location: Racine WI	E-mail reply from MTX: "We do not have location properties available for amps that we still do repairs on." Given MTX policy of no tech. help on current product I took a closer look at these 2 resistors. Cleaned up the resistor with the least signs of overheating and now I can just make out the markings. Pretty sure it's marked 1820 , which would be 182 ohms. Had 2 other pair of eyes look at it without telling them what I saw and both agreed. It measures 183 ohms while the really burnt one reads 254. Hope this helps the next guy that has to fix a JH600.

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