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I ordered a few IRFP240 and IRFP250 devices to try in the Magnum 150 PA board.

Both worked fine. Maybe a slight more gain out of the 250s, but the amp maxed out at about 110w PEP with both devices, as driven in a Magnum S6.

Since I received the radio with blown ERF7530s, I don't have any idea what the output was before hand. But the 250s seem to be working fine. About a 4-5x overall multiplication factor based on the drive level I measured when the amp was bypassed.

The only minor issue is that the IRFP devices are thicker, and the mounting screw holes are off just a little, since the device package is the newer TO-247 rather than the older TO-218. The screw insulator/spacer is no longer needed, but you still need an insulator between the device and heat sink.

Eric

[QUOTE="k2cb, post: 599440, member: 25548"] I ordered a few IRFP240 and IRFP250 devices to try in the Magnum 150 PA board. Both worked fine. Maybe a slight more gain out of the 250s, but the amp maxed out at about 110w PEP with both devices, as driven in a Magnum S6. Since I received the radio with blown ERF7530s, I don't have any idea what the output was before hand. But the 250s seem to be working fine. About a 4-5x overall multiplication factor based on the drive level I measured when the amp was bypassed. The only minor issue is that the IRFP devices are thicker, and the mounting screw holes are off just a little, since the device package is the newer TO-247 rather than the older TO-218. The screw insulator/spacer is no longer needed, but you still need an insulator between the device and heat sink. Eric [/QUOTE]

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