Choice of output mosfets for Pass A75

harrym · 18th April 2003, 02:14 PM

HI, I'm new to this forum and it is a fantastic site for those of us interested in building their own equipment. I wish I had known of this site when I started my project to build the Pass/Thaggard A75 amplifier some years ago.

Anyway, I am hoping to finish construction of this project soon. I have assembled and tested the main PCB. For the output mosfets I have the IRF 630 and IRF 9630 combination. The parts recommended in the original article (IRF230/IRF9231) were not available. Does anybody in the forum have any thoughts about the suitability of the 630/9630 mosfets for the A75 ? Would you recommend another more suitable and currently available combination. I would be very grateful for any responses before I go ahead and install the mosfets on to the heatsinks.

Thanking you in advance

Harish

Nelson Pass · 18th April 2003, 07:26 PM

They will probably work perfectly. Worst case is that you have to adjust the compensation a bit, which is covered in the article.

18th April 2003, 02:14 PM	#1
harrym diyAudio Member Join Date: Apr 2003 Location: Virginia	Choice of output mosfets for Pass A75 HI, I'm new to this forum and it is a fantastic site for those of us interested in building their own equipment. I wish I had known of this site when I started my project to build the Pass/Thaggard A75 amplifier some years ago. Anyway, I am hoping to finish construction of this project soon. I have assembled and tested the main PCB. For the output mosfets I have the IRF 630 and IRF 9630 combination. The parts recommended in the original article (IRF230/IRF9231) were not available. Does anybody in the forum have any thoughts about the suitability of the 630/9630 mosfets for the A75 ? Would you recommend another more suitable and currently available combination. I would be very grateful for any responses before I go ahead and install the mosfets on to the heatsinks. Thanking you in advance Harish

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18th April 2003, 07:26 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	They will probably work perfectly. Worst case is that you have to adjust the compensation a bit, which is covered in the article.

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