The best Mosfet for the ZOZ ?

ralf · 8th January 2002, 03:33 PM

I have used two matched pairs of irfp3710 for the SOZ.
Are they o.k. or should i use other (better)ones?
Has someone made experiences with different mostfets?

Ralf

FEThead · 9th January 2002, 03:35 AM

Ralf,

I have not used those devices. If they sound good to you they are OK. In my present amp I use 2SK1058s. These are intended to be audio amps. NOTE: (1) the source and drain pins are reversed relative to the irf series and, (2) the tab is connected to the source. Each of my amps are actually two Zen amps bridged and fed with signals 180 degrees out of phase. I do not use resistors in series with the sources (the sources are connected to the negative rail) so both FETs can be mounted to the same heatsink without insulating pads. Not using these pads roughly doubles the thermal conductivity between the device and the heatsink.

Previously I have built Zen amps using other irf series FETs. I think my present amp sounds better, but I do not know if that is due to the different FETs or the balanced circuit. If you try the '1058s in your amp let us know what you think. That would be a better comparison than the one I mentioned above.

Happy listening!

ralf · 9th January 2002, 10:19 AM

Hi "FTHead"

You tell me something about Mosfets for you ZEN, but i asked for Mosfet replaces in SON OF ZEN, because IRFP240 is not available in my Country.

Ralf

Freddie · 9th January 2002, 02:50 PM

ralf,

Farnell in Germany sells IRFP240.
http://www.farnell.com/germany/index.htm

/Freddie

ralf · 9th January 2002, 04:20 PM

Thanks, Freddie

I really searched with several search-Machines but never found them.

Thanks,

Ralf

cp642 · 9th January 2002, 04:48 PM

Ralf, try IRFP250.

FEThead · 9th January 2002, 06:41 PM

Ralf,

I am sorry I did not understand your question.

8th January 2002, 03:33 PM	#1
ralf diyAudio Member Join Date: Dec 2001 Location: Germany	The best Mosfet for the ZOZ ? I have used two matched pairs of irfp3710 for the SOZ. Are they o.k. or should i use other (better)ones? Has someone made experiences with different mostfets? Ralf

9th January 2002, 03:35 AM	#2
FEThead diyAudio Member Join Date: Jan 2002 Location: Colorado	SOZ FETs Ralf, I have not used those devices. If they sound good to you they are OK. In my present amp I use 2SK1058s. These are intended to be audio amps. NOTE: (1) the source and drain pins are reversed relative to the irf series and, (2) the tab is connected to the source. Each of my amps are actually two Zen amps bridged and fed with signals 180 degrees out of phase. I do not use resistors in series with the sources (the sources are connected to the negative rail) so both FETs can be mounted to the same heatsink without insulating pads. Not using these pads roughly doubles the thermal conductivity between the device and the heatsink. Previously I have built Zen amps using other irf series FETs. I think my present amp sounds better, but I do not know if that is due to the different FETs or the balanced circuit. If you try the '1058s in your amp let us know what you think. That would be a better comparison than the one I mentioned above. Happy listening! __________________ FEThead

9th January 2002, 06:41 PM	#7
FEThead diyAudio Member Join Date: Jan 2002 Location: Colorado	Ralf, I am sorry I did not understand your question. __________________ FEThead

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9th January 2002, 10:19 AM	#3
ralf diyAudio Member Join Date: Dec 2001 Location: Germany	Hi "FTHead" You tell me something about Mosfets for you ZEN, but i asked for Mosfet replaces in SON OF ZEN, because IRFP240 is not available in my Country. Ralf

9th January 2002, 02:50 PM	#4
Freddie diyAudio Member Join Date: Oct 2000 Location: Sweden	ralf, Farnell in Germany sells IRFP240. http://www.farnell.com/germany/index.htm /Freddie

9th January 2002, 04:20 PM	#5
ralf diyAudio Member Join Date: Dec 2001 Location: Germany	Thanks, Freddie I really searched with several search-Machines but never found them. Thanks, Ralf

9th January 2002, 04:48 PM	#6
cp642 diyAudio Member Join Date: Aug 2001	Ralf, try IRFP250.

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