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mike49504 5th September 2011 08:16 PM

JL Audio 500/1
Does anyone know the value of the gate resistors on this amp..

The board says rev 11

And its using IRFZ44's as the power supply fets

bdgf2004 5th September 2011 08:35 PM

Perry Babin 5th September 2011 08:58 PM

47 ohm. When you install them, install them with about 3/16 of clearance so they don't damage the board if it fails again.

mike49504 6th September 2011 01:14 AM

I noticed the outputs are shorted also..

When ordering replacements do i order the IRF540's or the 540A's ??

Just asking because i think i read somewhere that theese amps do funny things sometimes when replacing the outputs..

Perry Babin 6th September 2011 04:20 AM

I've used both the IRF540 (no suffix other than PBF) and the IRF540A with no problems. The IRF540N was the transistor that caused problems in some amp but those were class AB amps. I don't know if they cause any problems in this amp.

mike49504 11th September 2011 08:54 PM

Ok almost done putting the parts back into this amp..

Which one is the Bias pot in this amp or are both of them bias pots??

R565 and R563

Perry Babin 11th September 2011 09:21 PM

Neither is bias. In general, class D amps don't have bias pots. Don't turn either one.

mike49504 11th September 2011 10:36 PM

Do you happen to know the values of R515 and R516 ??

Perry Babin 11th September 2011 11:42 PM

R515 = 10 ohms
R516 = 47 ohms

mike49504 11th September 2011 11:44 PM


The drivers 4 the othputs are 2N3906's Locations


Correct or are there more drivers for the outputs??

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