That is what I am looking for.The 1/4 watt resistors.I have done the protection mod already.Just couldn't see clearly from the pics since its kinda small.The resistors in the photo I posted are refereing to the "resistor mod" when you change out the 1/4 watt resistors out with 1/2 watt ones. This mod is for the truely hard core HK board owner, and should only be done by someone who's had soldering experience. Or are you talking about wanting a pic of the resistor clipping for the protection removal mod ?
Sorry to make you dig???Thanks though...//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
Could you upgrade the mosfets? I don't know too much about them but I do know some are better than others.Anyway, too much current passes through the output mosfets, more than they are intended to handle, the mosfet goes bad, becomes a direct short...
Well, I guess my logic behind the 1/4 watt mod is since I was already replacing all of the 1/4 watts at the same time as the IRF9540's anyways, that I might as well put 1/2 watts in there.In case someone didn't get that, my point was the gate resistors will only burn up when the mosfet fails. Period.
So no need to upgrade them to 1/2 watt types. It is fruitless. While it won't hurt anything, it won't help anything either, just wasting time.
Ah I see. Well I'll own neither of these amps so I don't have to worry about all this lol.They should be IRF9640's, not IRF9540's... wrong parts totally different. IRF9540 handles more current, but less voltage than a IRF9640. As for putting better mosfets in, possibly. I think the IRFB31N20D would be a good replacement possibly for the IRF640, but not sure what to use to replace the IRF9640's as they are P Channel Mosfets and not that popular really, and usually not near as robust as their N-Channel counterparts. IRF640=200V and something like 19-22 amps, whereas the IRF9640 is 200V, but only 11amps... LOL... Just the way it goes. That's why there is usually more IRF9640's than IRF640's in an amp that uses those parts.
If you try to change your outputs in your HK4000D you are doing it at your own risk, the high voltage can kill you and if you use the wrong parts (anything other than the original part) you are likely to blow up your amp or have other weird problems. To use different mosfets you may also have to use different drive circuits and different gate resistors due to different input capacitances of different mosfets. Lots of techno-BS.
They should be IRF9640's, not IRF9540's... wrong parts totally different. IRF9540 handles more current, but less voltage than a IRF9640.